In some cases, the temperature history along with a calibration curve is used to calculate the real-time concrete strength based on the maturity concept. The sample size required for this test is a minimum after drying. Engineers test effects of fire on steel structures, nuclear plant design September 1, 2011 Amit Varma, a Purdue associate professor of civil engineering, is leading work that could lead to safer steel structures such as buildings and bridges and also an emerging type of nuclear power plant design. Curing techniques for test samples are important and the method chosen depends on the product and customer specifications. Just Concrete and a Coating? Preliminary Investigation • Type of concrete – Lightweight/Normal weight – W/C & mix design – Concrete thickness – Concrete age – Surface condition • Presence of radiant heat, vapor barrier • Location, location, location • Roof/walls/drainage/climate control/ventilation • Where to test and # of tests. Specifically, this procedure provides plane surfaces perpendicular to the specimen axis to evenly distribute loading forces. Israeli researchers develop anti-coronavirus coating for surfaces The cooperation between the different expertise of the scientists involved proved to be a key for the success of the study. The coefficient of thermal expansion of concrete is influenced largely by the coefficient of thermal expansion of the aggregates since the aggregate occupies 70-80% of the volume of the concrete. for concrete production, it is important to study the e ect of di erent curing method which best adapts to each individual casting process. Temperature and humidity control instruments for cured concrete testing. Another main reasoning for the significant variation in the high-temperature strength properties of concrete is the use of different testing conditions (such as heating rate and strain rate) and test procedures (hot strength test and residual strength test) due to a lack of standardized test methods for carrying out property tests. Here, the effect of temperature (room temperature as the reference, 200, 400, 600, and 800 °C), concrete cover (25 mm and 35 mm), concrete compressive strength (30 and 40 MPa), and CFRP wrapping. Curing Box for concrete cylinders is lightweight, and portable—74 lbs. Remove the slump mold uniformly; don’t use a twisting or jerking motion. April 25, 2017. For asphalt concrete mixtures made using PG XX-22 and PG XX-28 binders, the current test temperatures of −20, −10 and 0°C should be retained. A strength test result is always the average of at least two specimens tested at the same age. Weather stations track temperature, humidity, barometric pressure, and other data to forecast weather conditions. The measured temperature represents the temperature at the time of testing and may not be an indication of the temperature of the freshly mixed concrete at a later time. OBJECTIVE. I used an ANCOVA test to determine if there were differences between the rates of heating between different materials. Once you have done all of your research and purchased a sealer that shipped to your home - no problems - you are now ready to start the application process. Another term used to describe the state of fresh concrete is consistence, which is the ease with which concrete will flow. Figure 1 illustrates the variation of thermal conductivity of NSC as a function of temperature based on published test data and empirical relations. If the person is still 100. Pic-4 Viscosity test of bitumen Testing: Maintain the test bath temperature at 60 +/- 0. 1 Many studies, however, have shown that the temperature at an early age is the most important factor in the rate of strength gain. 51 to 1 for temperature. The testing chamber is cylindrical with a diameter 241 mm and length 686 mm. 98% of products ordered ship from stock and deliver same or next day. From the 1940s to the present day, many of them have relied on surface-based methods of testing for moisture. CRD-C38-73 Method of Test for Temperature Rise in Concrete. Fluke portable temperature measurement devices and tools are precise, accurate and rugged. , & Prasannan, S. Provide Class P concrete designed to meet a minimum average flexural strength of 570 psi or a minimum average compressive strength of 3,500 psi at 7 days or a minimum average flexural strength of 680 psi or a minimum average compressive strength of 4,400 psi at 28 days. Tests on Fresh Concrete. Ten hours curing at a temperature of about 90 degree Celsius will make attain 70% of its 28 days of strength. A wide variety of concrete temperature test options are available to you, such as cement testing machine, compression testing machine, and auto testing machine. to reduce the temperature differential between the center and outer edges of concrete elements. The HOBO UX120 Thermocouple Logger is a four-channel LCD data logger for measuring and recording temperature in a range of monitoring applications. Weather stations track temperature, humidity, barometric pressure, and other data to forecast weather conditions. In normal Portland cement concrete i. The temperature range is up to 600°C, the maximum axial load is 5 MN, the maximum confining pressure is 140MPa and the maximum torque is 5555 NM. Concrete thermal energy storage. Continuous DC Holiday Detection. Samples of concrete taken from old pavements and tested in compression indicate higher strengths after 25 years th an when the pavement was 1 to 3 years old. The standard R value for house insulation varies based on climate and temperature. When cylinders are cast to indicate whether the producer has delivered concrete of the required compressive strength, then standard curing is mandatory. Coronavirus Cases in India Updates, 09 May: The number of Covid-19 cases in the country neared the 60,000 mark, including 1,981 deaths. Some specimens underwent standard curing from 24 h after casting until the day of testing. United Kingdom and mainland Europe. Rent test equipment from the leading supplier of test and measurement instruments, Advanced Test Equipment Rentals (ATEC). Concrete Pipe Testing Machines are specially designed for Crushing Tests on Sewer and Drain Pipes, Concrete Pipes,… Concrete Non-Destructive NDT Test Equipment Qualitest offers extensive range of advanced non-destructive test equipment for concrete and other coarse grained…. Best Practice Guidelines for Concrete Placement Planning, Field Testing, and Sample Collection Page 1 September 2014 1 EXECUTIVE SUMMARY Concrete is the most widely used construction material and can be used in almost any environment for a multitude of applications but successful concrete construction begins with careful planning. The maturity method involves the measurement of three key parameters: time, concrete temperature and concrete strength. The test should be done by a concrete technician provided by the concrete ready mix supplier. Concrete rebound hammer — Original Schmidt OS8000 Less coring, with concrete strength and uniformity evaluation using rebound hammer technology Schmidt hammers by Proceq, the inventor of rebound hammer technology, have long been the global benchmark for non-destructive compressive strength estimation, and make it possible to drastically. Resin and hardener are dispensed and mixed simultaneously through the static mixing nozzle. 7) temperature test. The higher the curing temperature, the greater is the rate of hardening of concrete. 96 for respiratory rate and 0. Using a concrete maturity sensor allows you to collect such data. Concrete in itself is very sensitive to changes as due to its viscosity when it has not settled yet. to reduce the temperature differential between the center and outer edges of concrete elements. This information should accompany the set of cylinders made for a particular pour or pour location. 11 ) REQUIRED ON INTERSTATES! ACI nomograph for. ASTM C 1064 Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete. Performance Screening of Concrete Materials and Proportions Using Thermal Testing 2 www. The sample size required for this test is a minimum after drying. 1℃ Probe size:φ3X120mm Application: It is used to test the concrete temperature in the construction. Strictly, it is the amount of useful internal work necessary to produce 100% compaction. The slump test (ASTM C 143) m e a s u res concrete consistency, or the ability of fresh concrete to flow. Where appearance of the concrete is important, the water used for curing by pond-ing or immersion must be free of substances that will stain or discolor the concrete. The other important aspect of curing is temperature—the concrete can't be too cold or too hot. 7: HARDENED concrete TOPIC 2:concrete W8 ECS 256 UiTM PG 2. Simply aim, pull the trigger and display the temperature of the item being measured and the thermometer will display the temperature over a range of -60 to 500 °C. Cube Competition. Research also shows that CaCl testing is vulnerable to false readings, such that you can get both false positive and false negative results. Although the test apparatus measures the expansion directly, it does not provide absolute values of expansion, but characteristics of it. Any moisture condensation or observable darkening of the color of the concrete underneath the sheet suggests excessive moisture and means the. Have 3-inches concrete cover in all directions. The controls shall be ad-justed to initiate compensation for any difference between the concrete temperature so obtained and the tem-perature of the air as represented by the average temperature of the two thermometers that are located inside. 08 Concrete Temperature: shall be measured in accordance with the requirements of ASTM C1064. Start the test for temperature within 5 minutes of obtaining the sample. In hot climates, a lower penetration grade is preferred. Wireless Temperature Data Loggers for concrete testing. Be calibrated annually, or if there's a question of accuracy. CC Wai, Alan Wan Check temperature. The Concrete Moisture Test Starter Kit+ has everything you need to conduct Rapid RH L6 tests plus two Smart Logger temperature and relative humidity data loggers to monitor and record ambient job site conditions. Concrete Temperature Test at Site - Duration: 2:56. Measure and log concrete temperature history, calculate maturity, and evaluate in-place strength. Lean concrete base shall not be mixed nor placed while the atmospheric temperature is below 35° F (2° C), and shall not be placed on frozen ground. Compaction Studies of Asphalt Concrete Pavement as Related to the Water Permeability Test. 4°F, ±3°F (23°C, ±1. Living the past six years in South Florida I. The Rapid RH product line is the fastest, most cost effective and simplest way to meet ASTM F2170, the standard for in situ relative. Concrete Adiabatic Temperature Rise Test For CART, ATR-120HA (Tokyo Rico, Japan) was used, i. In practical view the fire point is the lowest temperature at which the application of test flame causes the material to ignite and burn at least for 5 seconds under specified conditions of test. 6111 Balcones Drive, Austin, Texas 78731 USA +1 (888) 451 6233. SmartRock ™ Concrete temperature and strength monitoring; SmartRock ™ Plus Value-added solution for ready-mix producers. Special provisions. Mass Concrete for Buildings Michael Hernandez / Concrete Construction / December 5, 2016 Eli Meir Kaplan Forms are insulated on the Proton Therapy project in Washington, D. This test produces a moisture vapor emissions rate (MVER), which is a reading of how much moisture content is released from 1000 square feet of concrete slab over a 24-hour period. " 160–1920 kg/m 3. Testing of Ground Tire Rubber. Epps Engineering Research Associate Bob M. Fluke portable temperature measurement devices and tools are precise, accurate and rugged. 4563, Prediction Model for Concrete Behavior. Affordable Smart Concrete Sensors and Software. The calcium chloride test method is used to determine the moisture vapor emission rate (MVER) from a concrete slab. The effects of temperature early in the life of concrete can strongly influence long-term stability. 1℃ Probe size:φ3X120mm Application: It is used to test the concrete temperature in the construction. Material Specification for Concrete – Materials and Production. The biggest issue when pouring concrete when the air temperature is just above freezing is the night time temperatures that will follow. Concrete and pavement attract much more heat than grass. 6 W/m°K and varies with temperature [ 18 ]. Some concrete specifications contain a maximum temperature for the freshly mixed concrete as delivered. Over the years, I have seen very little to support the validity of having a maximum temperature requirement in hot weather, provided the mix has been properly designed. Experts agree that the best temperature to pour concrete is between 50-60 °F. Maturity method involves 3 steps 1) Strength maturity relationship developed on first day paving. 1) Effect of temperature on concrete setting time (Ref. Immediately share data via email or Dropbox. The slump test (ASTM C 143) m e a s u res concrete consistency, or the ability of fresh concrete to flow. Ready mix producers in hot climates use chilled water or ice to lower the concrete temperature. In the United Kingdom, the standards specify a slump cone height of 300 mm, a bottom diameter of 200 mm and a top diameter of 100 mm. The concrete used for the adiabatic temperature rise test and the semi-adiabatic temperature rise test (in Section 3. By learning how much heat is released, an accurate estimate of the concrete strength can be determined. Cody, Robert D, AM Cody, Pg Spry and GL Gan, “Concrete Deterioration by Deicing Salts: An Experimental Study”. Check discharge time of the concrete (501. Though designs call for 7% air content, many loads of concrete are being rejected due to air content below the minimum of 4. Minimum Concrete temperature as placed and maintained Minimum concrete temperature as mixed for indicated air temperature Air Temperature-Above 30 °F Below 0 °F <12 in. A strength test result is always the average of at least two specimens tested at the same age. I know, that's still below freezing, but if the concrete has hot water mixed with it (120 degrees F) the concrete temperature should be around 65 - 70 F when you dump it on the ground. – Measurement of the amount of heat evolved or absorbed in a chemical reaction, change of state, or formation of a solution. Recommendations of RILEM TC 162-TDF: Test and design methods for steel fibre reinforced concrete Uni-axial tension test for steel fibre reinforced concrete Recommendations of TC 176-IDC: Internal damage of concrete due to frost action Slab test: Freeze/thaw resistance of concrete - Internal deterioration. This information should accompany the set of cylinders made for a particular pour or pour location. SAM-PRO Dual Moisture Meter, LCD BACKLIT DISPLAY- Sensor for Moisture & Temperature in Wood, Concrete, Drywall, Carpet. CP65 but who have little or no experience of high strength concrete (HSC). ASTM : C 140-03 Standard test methods for sampling and testing concrete masonry units and related units. The concrete slump test is known as "Standard Test Method for Slump of Hydraulic-Cement Concrete" and carries the code (ASTM C 143) or (AASHTO T 119). A numerical method to identify thermal conductivity from time history of one-dimensional temperature variations in thermal unsteady-state is proposed. True of False? The sample of concrete used for temperature determination must be rodded 25 times. The air temperature is not the only factor to consider when applying a concrete sealer. Principles. In some cases, the temperature history along with a calibration curve is used to calculate the real-time concrete strength based on the maturity concept. There are many reasons to form cracks, but temperature is the most common cause. Compaction Studies of Asphalt Concrete Pavement as Related to the Water Permeability Test. 2 service temperature and relative humidity, n—average ambient air temperature and relative humidity that typically will be found in a building’s occupied spaces during normal use. Figure 3 (b) shows the temperature difference between the surface and center of the cylinder, and the rates of temperature rise on the surface and at the center of the cylinder. Workability of concrete is defined as the ease and homogeneity with which a freshly mixed concrete or mortar can be mixed, placed, compacted and finished. CHLOR*TEST "CSN Salts" offers the specifier the availability of trouble-free performance testings, in the field, for chlorides, sulfates, and nitrates with one extraction. "The concrete must be of a lightweight nature, with a mass of not greater than 1. By the age of 28 days the high-temperature concretes were weaker than the 73°F concrete. Most producers will try to have the concrete be at least 65°F when it leaves the plant, which is generally good enough depending on air temperature and thickness of the concrete element. Concrete Temperature Monitoring IntelliRock III Temperature Loggers can monitor and document the temperature profiles and gradients of in-place concrete. Cement is actually just a component of concrete. In general, concrete temperature peaks at 48 hours and remains constant for seven days. Systematic testing of the raw materials, the fresh con­ crete and the hardened concrete is an inseparable part of any quality control programme for concrete which helps to. The maturity index value considers concrete temperature and curing time. Consequently it is believed that suitable comparisons between test cylinders prepared in accordance with ASTM C 3 I and in-place concrete can be made only when records of the ambient temperatures are available. 76 to 1 for heart rate, 0. The temperature measuring device used for testing freshly mixed concrete must be capable of. Gently press the concrete around the temperature measuring device at the surface of the concrete so that ambient air temperature does not affect the reading. 87 for gut feeling, 0. Curing of Concrete. Various Lab Test On Fresh Concrete. There are different types of house insulation materials, each having a different R value. When light-weight concrete (density ρ = 500∼1900 kg/m 3) is used for the structure to replace ordinary concrete, the weight of the structure with the same load-carrying capacity is reduced by 20-40%. QUIKRETE ® Type S Mortar and Grout Used to Lay More than 300,000 Blocks. 6, or as otherwise specified, a check test will be performed immediately at a new location in the sample. 4 or higher will be taken aside and re-screened 10 minutes later. CP65 but who have little or no experience of high strength concrete (HSC). The difference in temperature of the inner region and the surface of concrete is very dangerous regarding the integrity of concrete because cracks may form via thermal stress, if the different of. The flexural test on concrete can be conducted using either three point load test (ASTM C78) or center point load test (ASTM C293). Concrete thermal energy storage. 4 Constitutive Equation at Variable Temperature and Humidity 4. Figure 3 (b) shows the temperature difference between the surface and center of the cylinder, and the rates of temperature rise on the surface and at the center of the cylinder. Alpha Adroit's advanced materials testing centers provide materials testing (such as concrete testing and grout testing) and materials engineering services for accurate determination of representative in-situ material properties, building materials design, proper selection and quality control of construction materials (as part of construction quality control. It allows the field monitoring of curing temperatures, with data access using a web browser, AND it allows the control of laboratory water baths to replicate the exact field conditions of curing, in the test laboratory. It delivers client submittal and in-house tracking reports and lets you print lists of all specimens to be broken on a given day. Generally, a concrete temperature is limited to 70°C (160°F) during hydration. Cement Standards and Concrete Standards ASTM's cement and concrete standards are instrumental in the evaluation and testing of concrete, cement, and aggregates. Air Entrainment/Pressure Meter. Add water, if necessary, in accordance with ASTM C 94. NDT Instrument We are leading manufacturing & supplying of NDT Equipment which includes, Concrete rebound hammer, Concrete test hammer digital type, Original Schmidt Test Hammer, Ultrasonic Thickness Guage, Infra Red Temperature Meter, Ultrasonic Concrete Testing Equipment, Distance Estimator. SmartRock ™ Concrete temperature and strength monitoring; SmartRock ™ Plus Value-added solution for ready-mix producers. The average strength of the three cubes crushed at & or 28 days shall be referred to as one test result. Try to have the fresh concrete temperature close to 90 F when placing it in the test cylinders. Testing should always be done carefully. , & Prasannan, S. The asphaltic concrete was placed and compacted in three (3) lifts. Background- Quality control for concrete, both at the plant and at the job site, is critical to the final performance. The Calcium Chloride Moisture Test Kit measures the quantity of moisture passing through on and below grade concrete floors. The compressive strength of the concrete specimens were determined by conventional destructive testing at 1, 3, 7, 14, 28 and 56 days, and the Maturity computed using Nurse-Saul function. Scrap industrial plastic one/single shaft shredder. An ACI certified lab technician was also on site to record concrete temperature, test for air content, and make cylinders to be cured at the lab and tested for compressive strength. This equipment is designed to. Test procedure and for concrete compressive strength. Remove the slump mold uniformly; don’t use a twisting or jerking motion. The TQC DewCheck 4 Dewpoint Meter (DPM)/ Dewmeter is an extremely versatile dewpoint meter to measure and record all climate parameters required to treat surfaces. Fire testing of concrete masonry beams and lintels evaluates the ability of the member to sustain design loads under standard fire test conditions. Flooring professionals use the Infrared Thermometer for quick and accurate assessment and verification of the temperature of a concrete slab surface for meeting flooring, adhesive, and/or coating specs. and 7 or 31 days). 2 Creep Law of Mass Concrete at Variable Tempera-ture 4. Strength is usually determined by compression testing, and is expressed in Pounds per Square Inch (PSI). Generally, concrete in a structure cures at a MUCH faster rate than concrete in a test cylinder. High-temperature triaxial torsional creep tests of concrete at various hygral conditions. Pore Pressure and Drying of Concrete at High Temperature. Temperature and humidity control instruments for cured concrete testing. ACI 305R section 3. The logger makes it easy and convenient to record temperatures over a broad range (-260 to 1820° C) and can accept up to four J, K, T, E, R, S, B, or N type probes. Just Concrete and a Coating? Preliminary Investigation • Type of concrete – Lightweight/Normal weight – W/C & mix design – Concrete thickness – Concrete age – Surface condition • Presence of radiant heat, vapor barrier • Location, location, location • Roof/walls/drainage/climate control/ventilation • Where to test and # of tests. In the past limebased cement binders were often used, such as lime putty, but sometimes with other hydraulic cements, such as a calcium aluminate cement or with Portland cement to form Portland cement concrete (for its visual resemblance to. com While walking one of my customer's dogs, a black haired Belgian Shepherd, I noticed on his afternoon walks he would tend to skip across the pavement and concrete. While concrete can be poured at any time of year, there is an ideal range of temperature in which to pour concrete. PROCEDURE Conduct the test in accordance with ASTM C1064 –12. It is always important to have a good plan, monitor the concrete temperature at early age, and provide adequate curing in terms of temperature and moisture. Research Assistant and Jeff W. Temperature: ASTM C1064; one test hourly. C1017/C1017M Specification for Chemical Admixtures for Use in Producing Flowing Concrete. Various Lab Test On Hardened Concrete. Use the same sensor to measure concrete temperature and evaluate concrete strength. Activate the concrete temperature sensor and return to your office; the data will appear on your iPhone, Android Device, iPad, Tablet or PC. 5 degrees F A seismic hook has a _____bend with a 6db but not less than 3 inch extension at the free end. Test procedure and for concrete compressive strength. Posted under. United Kingdom & Europe In the United Kingdom, the Standards specify a slump cone height of 300-mm, a bottom diameter of 200-mm and a top diameter of 100-mm. 3, October 2011. Procedure: 3. Ready mix producers in hot climates use chilled water or ice to lower the concrete temperature. Schedule and determine the cold weather protection measurement of the concrete mix. Weather stations track temperature, humidity, barometric pressure, and other data to forecast weather conditions. 12-4) and sprinkling with water are excellent. ) of concrete cover in all direction around it. The test involves checking of an electric circuit to see if current flows to complete the electrical circuit. SmartBox ™ Sensor for concrete resistivity and temperature. Alkali Silica Reactivity (ASR) - Fine aggregate. Cement is actually just a component of concrete. Concrete Moisture Testing. 6111 Balcones Drive, Austin, Texas 78731 USA +1 (888) 451 6233. Affordable Smart Concrete Sensors and Software. Proceedings, Association of Asphalt Paving Technologists, Volume 56, 1987. The Effects of Temperature on Concrete Curing. See CHAPTER 3 Concrete Testing Strength and Durability are affected by: COMPACTION Compaction is removing the air from concrete. SAMPLING CONCRETE 1. What is the role of the control group in this. The concrete maturity method is used to account for the combined effects of time and temperature on the strength development of concrete. 1℃ Probe size:φ3X120mm Application: It is used to test the concrete temperature in the construction. In terms of testing, Ontario’s chief medical officer of health said the province’s maximum testing capacity is now over 20,000. Self-Consolidating Concrete. The logger makes it easy and convenient to record temperatures over a broad range (-260 to 1820° C) and can accept up to four J, K, T, E, R, S, B, or N type probes. , & Prasannan, S. The ratio of weight of oven dried aggregates maintained for 24 hours at a temperature of 100 to 110 0 C, to the weight of equal volume of water displaced. Certified Testing Laboratories, Inc. This equipment is designed to. Increase value Decrease value. According to the Penn State University College of Engineering, concrete will set in anywhere from about two to 19 hours, depending on the temperature. Viscosity of Asphalt Rubber by Rotational (Dip-N-Read) Viscometer. The measured temperature represents the temperature at the time of testing and may not be an indication of the temperature of the freshly mixed concrete at a later time. Janssen Synopsis: Fiber Reinforced Polymers have proven to be effective strengthening materials in the construction industry, due to their low weight (easy to apply), non-corrosiveness and high strength. You have to wait about 30 minutes or an hour before you can start to put a finish on fresh concrete. Proper documentation of test results for all tests includes: Start date and time of testing with ambient temperature and humidity. Backed by decades of concrete experience and expertise, ConcreteNews is a publication designed to teach and enlighten both new and seasoned concrete pros. methods for testing the workability, strength and durability of concrete. Air Content –Tw. Fluke portable temperature measurement devices and tools are precise, accurate and rugged. Acceptance test-ing includes tests on plastic concrete for slump, air content, density (unit weight), temperature, and tests on hardened concrete for strength and other durability properties as re-. It also needs to be able to be submerged at least 3 inches into the concrete, so the stem of the thermometer must be at least 3 inches long. 4 or higher, they will be denied boarding and will be rebooked. Some specimens underwent steam curing in a dry oven at 30°C and 50°C after casting until the day of testing. C1077 Practice for Agencies Testing Concrete and Concrete Aggregates for Use in Construction and Criteria for Testing Agency Evaluation. Engineers test effects of fire on steel structures, nuclear plant design September 1, 2011 Amit Varma, a Purdue associate professor of civil engineering, is leading work that could lead to safer steel structures such as buildings and bridges and also an emerging type of nuclear power plant design. Temperature of concrete can be monitored manually by means of a special thermometer or automatically by the use of thermocouples connected to a data acquisition system. Half Cell corrosion mapping is an effective method for assessing the severity of corrosion activity in concrete structures. Compaction Studies of Asphalt Concrete Pavement as Related to the Water Permeability Test. Concrete manual. Israeli researchers develop anti-coronavirus coating for surfaces The cooperation between the different expertise of the scientists involved proved to be a key for the success of the study. High-Strength Concrete at High Temperature - An Overview 4 °C/min or 300 °C/h. Product Details. The best temperature to apply a concrete sealer is 45-85 degrees Fahrenheit. Recommendations of RILEM TC 162-TDF: Test and design methods for steel fibre reinforced concrete Uni-axial tension test for steel fibre reinforced concrete Recommendations of TC 176-IDC: Internal damage of concrete due to frost action Slab test: Freeze/thaw resistance of concrete - Internal deterioration. 2 Reduce the sample to test size shown in Tex-401-A. That could spell trouble not just for insects, but for plant eaters of all sizes. 2-2019 Concrete materials and methods of concrete construction / Test methods and standard practices for concrete. Epps Engineering Research Associate Bob M. Concrete thermometers to assist with all concrete tests. Reply Link. With that temperature, you can go around to. Choose products with natural ingredients only: CBD oils made from all-natural botanical extracts ensure safety as well as enhance the effects of CBD. com While walking one of my customer's dogs, a black haired Belgian Shepherd, I noticed on his afternoon walks he would tend to skip across the pavement and concrete. The existing testing methods of adiabatic temperature rise in concrete were compared and analyzed in this article, the advantages and disadvantages were found out among every testing methods, and a testing device was designed and developed on the basic. When using a thermometer to measure the temperature of fresh concrete, a minimum of _____ of concrete should surround the sensing portion of the thermometer. Figure 3 (b) shows the temperature difference between the surface and center of the cylinder, and the rates of temperature rise on the surface and at the center of the cylinder. A wide variety of concrete temperature test options are available to you, such as cement testing machine, compression testing machine, and auto testing machine. (CTL) is an independent materials testing/inspection agency that has provided services for clients since 1958. Samples of concrete taken from old pavements and tested in compression indicate higher strengths after 25 years th an when the pavement was 1 to 3 years old. Drag up for fullscreen M M M. When using a thermometer to measure the temperature of fresh concrete, a minimum of _____ of concrete should surround the sensing portion of the thermometer. (38-mm) aggregate 0 2 4 6 8 10 12 14 40 60 80 100 120 Concrete Temperature, °F Initial Set, hr. The high voltage, or porosity technique, can be used to test coatings up to 25mm (1") thick and is ideal for inspecting pipelines and other protective coatings. Product Details. PROCEDURE Record all information on SFN 9987 or SFN 2455. Concrete temperature monitoring is a basic measurement conducted in most projects in order to ensure proper curing of the concrete after placement. The larger the concrete structure, the more heat it will likely generate. Properties of Concrete Concrete is an artificial conglomerate stone made essentially of Portland cement, water, and aggregates. Even when daytime temperatures are within the satisfactory range, winter concrete setting creates risks that could result in. The same moisture and temperature of the product should be used for the test. "While conventional concrete has a density of about 2300 kg/m 3, lightweight concrete has a density between 160 and 1920 kg/m 3. Concrete is a mixture of water, cement, and aggregate, Aggregate is made up of rock, gravel or sand Actively monitoring the temperature of our mix after the placement is one of the most important steps in the construction of a concrete structure. Airport-Related Cement Consumption Outlook, July 2017. Proceedings, Association of Asphalt Paving Technologists, Volume 56, 1987. REFERENCES ASTM C 1064/C 1064M - Temperature of Freshly Mixed Hydraulic Cement Concrete California Test 539 - Sampling Fresh Concrete. – Measurement of the amount of heat evolved or absorbed in a chemical reaction, change of state, or formation of a solution. The concrete slump test is known as "Standard Test Method for Slump of Hydraulic-Cement Concrete" and carries the code (ASTM C 143) or (AASHTO T 119). In cool water, I like to spool up with 15- or 17-pound Seaguar InvizX, as I still get the abrasion resistance and low stretch, but its presence in the water column is reduced. The test should be done by a concrete technician provided by the concrete ready mix supplier. ACI TEST; Aci Test. Prasad April 28, 2012 at 12:34 pm. By learning how much heat is released, an accurate estimate of the concrete strength can be determined. Increase value Decrease value. Also, when cutting samples from existing pavements for lab­ oratory correlation, a beam shape is the most suitable for sawing and testing. 1 states that "concrete can be produce. 3) rebound hammer test. StarNet, StarLog, The "Cure" for Concrete Moisture and pH ills, Volume VII Issue 2. Create professional PDF reports in the app. According to CNBC, anyone with a temperature of 100. DRILLED CONCRETE PIERS AND SHAFTS RELEASE - R3. Use the same sensor to measure concrete temperature and evaluate concrete strength. Note: Product availability is real-time basis. It allows the field monitoring of curing temperatures, with data access using a web browser, AND it allows the control of laboratory water baths to replicate the exact field conditions of curing, in the test laboratory. To a degree, the proximity to "completeness" in the reaction depends on the rate a. Alpha Adroit's advanced materials testing centers provide materials testing (such as concrete testing and grout testing) and materials engineering services for accurate determination of representative in-situ material properties, building materials design, proper selection and quality control of construction materials (as part of construction quality control. (CTL) is an independent materials testing/inspection agency that has provided services for clients since 1958. 2-2019 Concrete materials and methods of concrete construction / Test methods and standard practices for concrete. In practical view the fire point is the lowest temperature at which the application of test flame causes the material to ignite and burn at least for 5 seconds under specified conditions of test. Circular Chart Recorder. The material used for dikes may also discolor the concrete. CS-704 (12-19) Page 3 of 5 1. 55 to 1 for response, 0. Read honest and unbiased product reviews from our users. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Slightly more than 60% reported that employees who were in contact with the infected employee are placed on leave. At curing temperatures of 40 °C and 50 °C, t he FA concretes have strength equivalent to PC concrete at early ages. 0 SECTION 31 63 29 BART FACILITIES STANDARDS Issued: January 2013 PAGE 6 OF 7 STANDARD SPECIFICATIONS maximum test load, with a constant time interval between increments of 5 minutes. The Hot Box method is used to predict the insitu concrete temperature during a concrete pour. 4) for this particular concrete block. The effects of temperature early in the life of concrete can strongly influence long-term stability. Rent test equipment from the leading supplier of test and measurement instruments, Advanced Test Equipment Rentals (ATEC). The best temperature to apply a concrete sealer is 45-85 degrees Fahrenheit. Resin and hardener are dispensed and mixed simultaneously through the static mixing nozzle. SmartBox ™ Sensor for concrete resistivity and temperature. Other models for use with split furnaces and induction heating, up to 1600 °C (2900 °F). Cube test of concrete and factors affecting concrete compressive strength. Get the Load value in KN ( kilo newton ) from CTM ( compressive testing machine ). Concrete test cylinders play an extremely important role in the placement of concrete for construction and engineering purposes. Experts agree that the best temperature to pour concrete is between 50-60 °F. A relative humidity reading of 75% or below is acceptable for most tile applications. Best Temperature to Apply a Concrete Sealer When you have concrete, and you know that you have to seal it with a concrete sealer, the next step is figuring out which sealer to purchase. 2 Testing plays an important role in controlling the quality of cement concrete work. Pre-cooling of Concrete. 6 Drying and Wetting of Concrete. 1°C) over an ambient range of -10 to 100°F (-23 to 37. Product Overview. Activate the concrete temperature sensor and return to your office; the data will appear on your iPhone, Android Device, iPad, Tablet or PC. The test involves checking of an electric circuit to see if current flows to complete the electrical circuit. Details About Moisture Meter Wood And Concrete Temperature Humidity Mult Function Lcd Ms 7002 Concrete Wood Moisture Meter Tester Newegg Portable concrete moisture tester proceq hygropin moisture meters geostar ligno tec rh concrete test conforms to astm f2170 11 concrete moisture meter 0 to 6 percent moisture meters geostar concrete testing. Measurement Instruments. Test in accordance with Tex-448-A or Tex-418-A. How to Resurface Concrete with Re-Cap - YouTube. 2-2019 Concrete materials and methods of concrete construction / Test methods and standard practices for concrete. Here, the effect of temperature (room temperature as the reference, 200, 400, 600, and 800 °C), concrete cover (25 mm and 35 mm), concrete compressive strength (30 and 40 MPa), and CFRP wrapping. Start taking temperature measurements of the concrete (per ASTM C 1064) within 5 minutes after securing the remixed composite. Have students measure and record the temperature of the material and the water bath every minute for 10 minutes (see Table 1 for a sample data table). Concrete doesn't have to be cold. 2—Scope This guide discusses general recommendations, concrete temperature during mixing and placing, temperature loss during delivery, preparation for cold weather concreting, protection requirements for concrete with or without. This test describes how cylindrical concrete test specimens are made. If there is more foam in the neck than the equivalent of 2 percent air content divisions after inversion and rolling, discard test and use more alcohol. In addition, for concrete subject to cold weather, the temperature control plan shall also include the following: a) Type of insulation, R value and number of layers, including test data verifying the R value. Cement Standards and Concrete Standards ASTM's cement and concrete standards are instrumental in the evaluation and testing of concrete, cement, and aggregates. Typical values are between 80° and 95° F as measured by ASTM C 1064-86. Transmit data wirelessly. Proper water content and temperature are essential for good curing. 29 Sep 12 16:55. View and analyze temperature differentials between sensors, and peak temperature data for individual sensors or multiple sensors at once. When adding concrete to a foundation, for example, the local building jurisdiction may require a witnessed slump test by a building inspector before you can pour the concrete. The concrete curing temperature profiles of the piles were used to detect the presence of significant defects in the piles. By Mitch Rector. Others may want to dip their toes to test the temperature before they jump into Lanegan’s choppy, occasionally dissonant but revelatory waters. This is a wireless sensor and concrete temperature meter that helps you track the temperature of concrete, from fresh to hardened stages. Compressive Strength of Concrete Cubes – Lab Test & Procedure Overall Strength of a structure such as flexural resistance and abrasion directly depends upon the compressive strength of concrete. Even in October the surface temperature reached 112. A strength test result is always the average of at least two specimens tested at the same age. The necessary chemical reactions that set and strengthen concrete slow significantly below 50 °F and are almost non-existent below 40 °F. for concrete production, it is important to study the e ect of di erent curing method which best adapts to each individual casting process. Maturity lets you estimate concrete strength in-place to speed construction. In This video i show 1. Apparatus The apparatus consists of the following: Temperature Measuring Device: Use a device that can measure the temperature of the freshly mixed concrete to ± 1 °F. Concrete test cylinders play an extremely important role in the placement of concrete for construction and engineering purposes. Controlling this is usually important as cement hydration reactions, setting time, compressive strength gain, workability and concrete volume are. This mix contains coarse aggregate as large as 1/2 inch. Workability of concrete is defined as the ease and homogeneity with which a freshly mixed concrete or mortar can be mixed, placed, compacted and finished. Curing Time for Concrete. Over 42% said their facility is shut down temporarily for testing and cleaning. 2 Traditionally, quality of concrete in construction works is calculated in terms ofits 28 days compressive strength, This procedure requires 28 days ofmoist curing before testing, which is too long a period to be ofany value for either concrete construction control or applying timely corrective measures. Immediately share data via email or Dropbox. For the sake of assessment, it is generally assumed that concrete heated to above 300 o C has lost all its strength. The slump test (ASTM C 143) m e a s u res concrete consistency, or the ability of fresh concrete to flow. Over the past 5 years, several studies have documented dwindling insect. Also, when cutting samples from existing pavements for lab­ oratory correlation, a beam shape is the most suitable for sawing and testing. LCF systems assess the performance of materials at elevated isothermal conditions when subjected to high loads and plastic deformations. A numerical method to identify thermal conductivity from time history of one-dimensional temperature variations in thermal unsteady-state is proposed. necessary if temperature is the only test being performed. , a water-cooling system that was designed to keep a specimen under an adiabatic condition. Some of the best insulation materials are: House Insulation R value of Blown in Cellulose Insulation is 3. Concrete is one of the most versatile materials used in modern construction and one of the most important. Properties of Concrete Concrete is an artificial conglomerate stone made essentially of Portland cement, water, and aggregates. At an age of 1 day the 120°F concrete was strongest and the 25°F concrete was weakest. Detector Tool for Mold Test | Firewood | Home Inspection at Amazon. Air Content –Tw. From new construction to repair of concrete, asphalt or mortar, Sakrete has the products you need to get the job done. Simply guessing without actually testing the mix design curing temperature sensitivity is not accurate for field situations, due to the wide range of field temperatures and mix design variations. The Relative Humidity (RH) test involves placing probes in the concrete and taking readings with a hygrometer. Their relief was short-lived. This test can be used as a control test and gives an indication of the concrete uniformity from batch to batch. Structural Engineering. It is critical (I’m going to repeat that- critical) that the concrete sets before it is exposed to freezing temperatures. In cool water, I like to spool up with 15- or 17-pound Seaguar InvizX, as I still get the abrasion resistance and low stretch, but its presence in the water column is reduced. Have 3-inches concrete cover in all directions. An Australian government inquiry is underway into why 2,700 passengers and crew were allowed to disembark in Sydney on March 19 before the test results of sick passengers were known. As a result of increase in temperature, there is considerable water loss due to evaporation which speeds up the cement hydration process. The main product developed under this project is a software program, named Concrete Works, which gives laboratory technicians, engineers, and contractors a tool that combines concrete design, analysis, and performance prediction to improve and optimize the performance of concrete structures. CRD-C38-73 Method of Test for Temperature Rise in Concrete. Generally, concrete in a structure cures at a MUCH faster rate than concrete in a test cylinder. Plastic construction is rugged, durable and rustproof. Concrete Non-Destructive Testing Equipment test, concrete temperature monitoring. Immediately, the International scientific teams moved in to deal with these highly virulent epidemics where their. Since maturity is related to concrete strength, the maturity method is a way to accomplish this without solely relying on standard test specimens and laboratory testing. If there is more foam in the neck than the equivalent of 2 percent air content divisions after inversion and rolling, discard test and use more alcohol. Figure 3 (b) shows the temperature difference between the surface and center of the cylinder, and the rates of temperature rise on the surface and at the center of the cylinder. Through a back calculation, it was found that the minimum allowable temperature difference is around 20. Although the test apparatus measures the expansion directly, it does not provide absolute values of expansion, but characteristics of it. Temperature affects the rate of hydration. It is used almost in every construction sites. The average strength of the three cubes crushed at & or 28 days shall be referred to as one test result. Cite this Video. 98% of products ordered ship from stock and deliver same or next day. Moderate temperatures make the placement crew's job easier as it sets up at a good pace, allowing ample time for edging, jointing, troweling and curing. By this single test one judge that whether Concreting has been done properly or not. Some specimens underwent standard curing from 24 h after casting until the day of testing. This concrete temperature sensors kit comprises a UX120-014M, Protective enclosure and 4 Type K thermocouples (2 Metres in length each). Test sections of pavement in Ne w Yo r k State built with and. Place and maintain concrete at the recommended temperature. A lot of what everyone has mentioned is correct. Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete is which section and ASTM? Section 1 and ASTM C1064 Position the temperature measuring device so that the end of the temperature sensing portion is submerged a minimum of _________ into the freshly mixed concrete. Most state DOT's have the 90 minute rule, but do allow up to 120 minutes if a super plasticizer or high range water reducer is used. Increase value Decrease value. Proceedings, Association of Asphalt Paving Technologists, Volume 56, 1987. Based on the regression analysis of the test data, a calculation model of the adiabatic. Cylinder sizes are usually 6 in. • Testing Apparatus – Humidity Probe and Digital Meter; Accuracy ± 2-3%; • HVAC; Conditioning – Concrete slabs and air space above the floor slab shall be at service temperature and RH for 48 hours prior to measuring concrete RH; • Testing Procedure - Slabs drying from one side, Drill holes 40% depth of concrete. 5V for 60 hours operation (40 hours operation with backlight switched on) Ordering Information UNITS 340 00 202 Concrete Test Hammer DIGI-SCHMIDT, Type ND 340 00 211 Concrete Test Hammer DIGI-SCHMIDT, Type LD. Intro to Concrete Sensors - YouTube. Cement is actually just a component of concrete. Concrete Cure Time Chart with Temperature. The basis of maturity is that each concrete mixture has a unique strength-time/temperature relationship. The salt absorbs moisture in that environment (and presumably coming from the concrete slab) and the. Behaviour of cement concrete at high temperature Article (PDF Available) in Bulletin of the Polish Academy of Sciences, Technical Sciences 61(1) · March 2013 with 21,693 Reads How we measure 'reads'. This mix contains coarse aggregate as large as 1/2 inch. Our company has been created with the testing industry needs in mind,this blueprint includes achieving a benchmark in customer service,supply of equipment and value for money. How to Resurface Concrete with Re-Cap - YouTube. Circular Chart Recorder. 12-4) and sprinkling with water are excellent. It’s a general rule that the lighter the color of concrete, the less heat it absorbs. IS 14959(Part 1):2001 Method of test for determination of water soluble and acid soluble chlorides in mortar and concrete:Part 1 Fresh mortar and concrete IS 14959(Part 2):2001 Method of test for determination of water soluble and acid soluble chlorides in mortar and concrete:Part 2 Hardened mortar and concrete. If your concrete is new, you'll need to let it cure -- wait at least one month before applying sealer. Curing Concrete Test Specimens Curing of concrete test specimens is usually different from concrete placed during construction. Sealer needs to be applied in dry conditions because it won't adhere to damp concrete. Have 3-inches concrete cover in all directions. Janssen Synopsis: Fiber Reinforced Polymers have proven to be effective strengthening materials in the construction industry, due to their low weight (easy to apply), non-corrosiveness and high strength. 1 inch of insulation is = to 30 inches of concrete. In porous surface aggregates, the bond strength increases due to setting of cement paste in the pores. Guide to Durable Concrete, American Concrete Institute, 201. Concrete is an artificial conglomerate stone made essentially of Portland cement, water, and aggregates. The Government will. 3 Microdiffusion Mechanism of Creep and Its Ther­ modynamics 4. Calculate the area of concrete cube - 150 mm * 150 mm = 22500 mm2 Compressive strength of cube = Load ( N. Some specimens underwent standard curing from 24 h after casting until the day of testing. Setting of Concrete. Other loads of concrete are rejected due to being out of specification on slump or temperature. 0 C for slow load tension test (modified by 1. You have to wait about 30 minutes or an hour before you can start to put a finish on fresh concrete. Rebar locators determine the location, depth, and size of rebars and other metals under the surface of the concrete. This is due to the fact that the paste volume has no significant impact on tensile strength. Learn more about all of the concrete products offered through Sherwin-Williams from Protective Concrete to Decorative Concrete. Testing with either method will tell you how precisely how much moisture is present, making it possible to choose a surface flooring that is appropriate. MERL-2015-073. Our company has been created with the testing industry needs in mind,this blueprint includes achieving a benchmark in customer service,supply of equipment and value for money. If the concrete design strength is 6,000 psi or greater, the initial curing temperature must range from 68 - 78 degrees F. In UAE the maximum allowable concrete temperature is 30C. There are two types of high voltage holiday detectors- Continuous DC and Pulsed DC. Additionally, anti-corrosive testing for high-temperature service coatings can include ASTM G85, "Standard Practice for Modified Salt Spray (Fog) Testing. Even when daytime temperatures are within the satisfactory range, winter concrete setting creates risks that could result in weak, inadequate concrete. After moisture, the concrete surface temperature along with the air temperature causes the most amount of problems when applying sealers to decorative concrete. 08 Concrete Temperature: shall be measured in accordance with the requirements of ASTM C1064. The flowability of the fresh concrete can be tested with the V-funnel test, whereby the flow time is measured, figure 2. Fogging and Sprinkling Fogging (Fig. Portable Curing Boxes. Coatings on concrete can also be tested using this method. 70 per inch. This is a quality check and control to determine whether formworks and shoring can then be dismantled (for suspended section), and slab on grade or bridges may be opened to traffics for stressing. Concrete Testing Lab Tests your mix design using ASTM C1074 maturity methods. (CASABLANCA) Simple Installation Cheap Mesh Swivel Office Desk MID Back Lumbar Support Desk Chair. Thermal damage. New Concrete Requirements. , & Prasannan, S. In the past limebased cement binders were often used, such as lime putty, but sometimes with other hydraulic cements, such as a calcium aluminate cement or with Portland cement to form Portland cement concrete (for its visual resemblance to. 2 Reduce the sample to test size shown in Tex-401-A. Make corrections as follows:. Temperature measuring device: The temperature measuring device shall be capable of accurately measuring the temperature of the freshly mixed concrete to ± 0. By the age of 28 days the high-temperature concretes were weaker than the 73° concrete. the temperature of concrete. CONTROLS is the only testing equipment manufacturer who developed in the late 80s, in partnership with the main research laboratories, the first industrial adiabatic concrete calorimeter, so far having been limited to few. Slump is normally measured by filling an " Abrams cone " with a sample from a fresh batch of concrete. ACI 306 specify limits for concrete temperature in cold weather conditions. Concrete rebound hammer — Original Schmidt OS8000 Less coring, with concrete strength and uniformity evaluation using rebound hammer technology Schmidt hammers by Proceq, the inventor of rebound hammer technology, have long been the global benchmark for non-destructive compressive strength estimation, and make it possible to drastically. I used an ANCOVA test to determine if there were differences between the rates of heating between different materials. However you define it, though, the bottom line remains the same: Slump is a test for the rigidity of uncured concrete. Cylinder Transport. The adiabatic method is the only method allowing correct evaluation of the heating process inside massive concrete works. 1), but most of them have been difficult to apply in an actual. The air temperature is not the only factor to consider when applying a concrete sealer. Creep Test cont’d •Creep generally occurs at elevated temperatures, so it is common for this type of testing to be performed with an environmental chamber for precise heating/cooling control. Hot water-Your ready mixed concrete producer will usually have, and use, hot water in the concrete when the weather turns cold. For precast concrete operations, this can be the plant environment if indoors, or outside if product is cured outside. The compression test shows the compressive strength of hardened concrete. For all classes of concrete in production three cubes shall be tested at 7 days and three at 28 days or as required by the consultant/client. Quality Management Plan Guidance for Concrete used for Construction of Significant Features. If it's between 0 and -10, than the heat from the cement should be enough to overcome the freezing temperature, but I would insulate anyway just in case. Experimental Procedure 2. Best Practice Guidelines for Concrete Placement Planning, Field Testing, and Sample Collection Page 1 September 2014 1 EXECUTIVE SUMMARY Concrete is the most widely used construction material and can be used in almost any environment for a multitude of applications but successful concrete construction begins with careful planning. 1 KN = 1000 N. The curing tank heater is used to control water temperature in concrete curing tanks at the required 73. 9) water penetration test. 96 for respiratory rate and 0. Curing can therefore be achieved either through maintaining mixing water in the concrete during early hardening or by preventing moisture loss from the surface by sealing. different binder combinations on the heat of hydration in mass concrete by conducting the adiabatic temperature rise test and finite element thermal analysis of mass concrete mixtures with specified compressive strength of 30 MPa. If it's between 0 and -10, than the heat from the cement should be enough to overcome the freezing temperature, but I would insulate anyway just in case. 1 These test methods cover the physical testing of gypsum, gypsum plasters, and gypsum concrete. A temperature monitoring device can help you out in cold and hot weather conditions to protect the concrete (surface). 1 This test method covers the determination of temperature of freshly mixed portland cement concrete. The material used for dikes may also discolor the concrete. 4 TEST FOR TEMPERATURE RISE IN CONCRETE (C 38-73) are 12 in. Create professional PDF reports in the app. Please sign in to your account to see your pricing, which may be different from the price displayed. This story was written and produced by NJ Spotlight. 101K subscribers. Ten hours curing at a temperature of about 90 degree Celsius will make attain 70% of its 28 days of strength. Fire Proofing Depth Gauge. Rebar Corrosion NDT; iCOR ® NDT device for testing the rate of corrosion. A lot of what everyone has mentioned is correct. All-in-One: Concrete Strength, Temperature and Relative Humidity. Preface This is the thirteenth edition of the combined CSA A23. View Notes - ACI: Concrete Field Testing Technician GradeTerm: Definition: C 1064 Standard Test Method for temperature of freshly mixed hydraulic-cement concrete. Specimen Curing. View and analyze temperature differentials between sensors, and peak temperature data for individual sensors or multiple sensors at once. The concrete slump test is an on-the-spot test to determine the consistency as well as workability of fresh concrete. Temperature bars are placed at right angles to the main reinforcing bars. buy bs 1881-130(1996) : 1996 testing concrete - part 130: method for temperature-matched curing of concrete specimens from sai global. Compressive Strength: Test concrete for compressive strength in accordance with CBC Section [[1905. Ready mix producers in hot climates use chilled water or ice to lower the concrete temperature. Proper compaction results in concrete with an increased density which is stronger and more durable. The biggest issue when pouring concrete when the air temperature is just above freezing is the night time temperatures that will follow. CHLOR*TEST "CSN Salts" offers the specifier the availability of trouble-free performance testings, in the field, for chlorides, sulfates, and nitrates with one extraction. Concrete quality control testing for the construction industry throughout British Columbia. For asphalt concrete mixtures made using PG XX-22 and PG XX-28 binders, the current test temperatures of −20, −10 and 0°C should be retained. The Rapid RH product line is the fastest, most cost effective and simplest way to meet ASTM F2170, the standard for in situ relative. This test produces a moisture vapor emissions rate (MVER), which is a reading of how much moisture content is released from 1000 square feet of concrete slab over a 24-hour period. Concrete compressive strength for general construction varies from 15 MPa (2200 psi) to 30 MPa (4400 psi) and higher in commercial and industrial structures.