ASTM C1064/C1064M - Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete Flashcards
Concrete containing aggregate greater than 75 mm [3 in] may require up to ___ minutes for the transfer of heat from aggregate to mortar”
20 minutes
Container shall be large enough to provide at least ___mm [___ inches) of concrete in all directions around the sensor of the temperature measuring device.
75 mm [3 in]
Temperature measuring device shall be capable of accurately measuring the concrete temperature to ___C [___F]
0.5* C [1* F]
Temperature measuring device shall have a range of __* to __* C [__* to __*F]
0* to 50* C
30* to 120* F
The accuracy of the temperature measuring device should be verified at least ________, or whenever there is a question of ________.
Annually,
accuracy
TRUE or FALSE
Temperature can be measured in a wheelbarrow?
True
TRUE or FALSE
Temperature can be made in a wall form?
True
A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temperature.
False - Composite sample IS NOT required if the only purpose of the sample is to determine temperature.
What must be done immediately after the temperature measuring device has been inserted into the concrete sample?
Close the void left by the placement by gently pressing the concrete around the device.
Why do you close the void created when placing the temperature measuring device into the concrete?
To prevent ambient air temperature from affecting the reading.
How long must the temperature measuring device remain the concrete?
At least 2 minutes, but not more than 5 minutes
Read and record the temperature of the concrete to the nearest ___C [___F]
0.5* C [1* F]
TRUE or FALSE
Remove the temperature measuring device to read and record the concrete temperature
False - Leave the device in the concrete until AFTER you have read and recorded the temperature
TRUE or FALSE
The measured temperature represents the temperature of the concrete at the time of testing and may not be be an indication of the temperature of the concrete at a later time.
True
What is one reason to take temperature of the concrete?
To verify conformance
TRUE or FALSE
You do NOT need to rod the concrete sample prior to taking the temperature?
True
TRUE or FALSE
A maximum temperature of freshly mixed concrete is specified in Test Method C1064/C1064M?
False - this test method provides directions for measuring the temperature, not specific concrete specs.
Design of the temperature measuring device shall be such that it allows ___ mm [___ in] or more immersion during operation.
75 mm [3 in]
Place in order: (TMD = Temperature measuring device) A - close void left left by placement B - remove TMD C - leave in concrete 2 to 5 minutes D - place TMD into concrete sample E - record readings
D - place TMD into concrete sample A - close void left left by placement C - leave in concrete 2 to 5 minutes E - record readings B - remove TMD
