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15 Cards in this Set
- Front
- Back
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the temperature of concrete may be mixed in a wheelbarrow? True or False
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True
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The Sensor of the temperature measuring device shall have at least ____ in. ____mm of concrete cover in all directions
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3 in, 75 mm
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The temp measuring device shall have a capacity of measuring temp of freshly mixed concrete to +/- ____ degrees F ____degrees C throughout a range of ____ to ___ degrees F (____to____degrees C.)
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1* F (.5*C), 30*,120, [0, 50]
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The temp measuring device shall be calibrated _____, or whenever there is a question of _____.
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Annually; Accuracy
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The temp of concrete may be measured in a wall form?
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True
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A composite sample of concrete is required even if teh only purpose for obtaining the sample is to determine temperature?
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False
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What must be done to the sample container prior to sampling the concrete?
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Dampen (with water)
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What must be done to the concrete surrounding the temp device after the device is submerged in the fresh concrete
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Press the concrete around the temp device at the surface of the concrete
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How long must the temp device remain in the freshly mixed concrete for an accurate reading?
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2 minutes or until the temp reading stabilizes.
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After the temp of the concrete is read, what is then required?
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Recording of temp
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Complete the temp measurement of freshly mixed concrete within _____ minutes after obtaining the sample.
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5
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The temperature of the concrete is recorded tot he nearest ___ degree F [___ degree C]
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1, 0.5
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According to ASTM 1064, what is one reason to take the temp of concrete?
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verify conformance to a specified requirement for temp of concrete
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A max temp of freshly mixed concrete is specified in ASTM 1064. True or False?
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False
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What special procedures are required when taking the temp of concrete containing large size course aggregate (over 3in. [75 mm[)?
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May require a longer period of time, up to 20 minutes for the transfer of heat from the aggregate to the mortar
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