ASTM C1064/C1064M - Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete

Question 1

Concrete containing aggregate greater than 75 mm [3 in] may require up to ___ minutes for the transfer of heat from aggregate to mortar”

Answer 1

20 minutes

Question 2

Container shall be large enough to provide at least ___mm [___ inches) of concrete in all directions around the sensor of the temperature measuring device.

Answer 2

75 mm [3 in]

Question 3

Temperature measuring device shall be capable of accurately measuring the concrete temperature to ___C [___F]

Answer 3

0.5* C [1* F]

Question 4

Temperature measuring device shall have a range of __* to __* C [__* to __*F]

Answer 4

0* to 50* C

30* to 120* F

Question 5

The accuracy of the temperature measuring device should be verified at least ________, or whenever there is a question of ________.

Answer 5

Annually,

accuracy

Question 6

TRUE or FALSE

Temperature can be measured in a wheelbarrow?

Answer 6

True

Question 7

TRUE or FALSE

Temperature can be made in a wall form?

Answer 7

True

Question 8

A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temperature.

Answer 8

False - Composite sample IS NOT required if the only purpose of the sample is to determine temperature.

Question 9

What must be done immediately after the temperature measuring device has been inserted into the concrete sample?

Answer 9

Close the void left by the placement by gently pressing the concrete around the device.

Question 10

Why do you close the void created when placing the temperature measuring device into the concrete?

Answer 10

To prevent ambient air temperature from affecting the reading.

Question 11

How long must the temperature measuring device remain the concrete?

Answer 11

At least 2 minutes, but not more than 5 minutes

Question 12

Read and record the temperature of the concrete to the nearest ___C [___F]

Answer 12

0.5* C [1* F]

Question 13

TRUE or FALSE

Remove the temperature measuring device to read and record the concrete temperature

Answer 13

False - Leave the device in the concrete until AFTER you have read and recorded the temperature

Question 14

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.

Answer 14

True

Question 15

What is one reason to take temperature of the concrete?

Answer 15

To verify conformance

Question 16

TRUE or FALSE

You do NOT need to rod the concrete sample prior to taking the temperature?

Answer 16

True

Question 17

TRUE or FALSE

A maximum temperature of freshly mixed concrete is specified in Test Method C1064/C1064M?

Answer 17

False - this test method provides directions for measuring the temperature, not specific concrete specs.

Question 18

Design of the temperature measuring device shall be such that it allows ___ mm [___ in] or more immersion during operation.

Answer 18

75 mm [3 in]

Question 19

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

Answer 19

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