Section 2: Temperature of Fresh Concrete

Question 1

How far must the thermometer be submerged?

Answer 1

3 in [75 mm]

Question 2

How accurate should the thermometer be?

Answer 2

Within one degree (°F)

Question 3

What should the range of the thermometer be?

Answer 3

30 to 120 °F

Question 4

When should the thermometer be verified within?

Answer 4

1 year

Question 5

Can temperature be measured in a wheelbarrow?

Answer 5

Yes

Question 6

Does temperature have to be in a composite sample?

Answer 6

No, if only temperature is being tested it does not have to be a composite smaple.

Question 7

How big must be the container for measuring temperature?

Answer 7

3 inches of cover or at least 3 times the nominal maximum size (if aggregate is bigger than 1 inch)

Question 8

What are the characteristics of concrete with high initial temperature?

Answer 8

higher than normal early strength and lower than normal later strength

Question 9

What are the characteristics of concrete with low initial temperature?

Answer 9

The concrete will develop strength slower, but overall be higher quality.

Question 10

What can concrete temp influence?

Answer 10

Chemical admixtures, air entraining admixtures, pozzolanic materials, and other additives and admixtures

Question 11

How long must the thermometer stay in concrete for temp reading?

Answer 11

2 (min) to 5 minutes (max)

Question 12

How accurate should the temperature be recorded to?

Answer 12

1 °F