CCIL Concrete Field Testing Procedures 2

Question 1

When performing a slump test per ASTM C143, how many layers of concrete are used to fill the slump cone?

Accepted Answer

Three layers

Answer

The slump cone is filled in three equal layers, each rodded 25 times with the tamping rod.

Question 2

What is the minimum curing temperature specified for standard-cured concrete cylinders per ASTM C31?

Accepted Answer

16°C (60°F)

Answer

ASTM C31 requires standard curing between 16°C (60°F) and 27°C (80°F) for the initial curing period.

Question 3

Which instrument is used to measure the air content of fresh concrete using the pressure method?

Accepted Answer

Type B air meter

Answer

The Type B pressure meter is the most common device used for air content measurement per ASTM C231.

Question 4

How long must a concrete cylinder remain undisturbed in its mold after casting before it can be transported to the lab?

Accepted Answer

At least 8 to 48 hours depending on mix

Answer

Per ASTM C31, cylinders must remain undisturbed for 8 to 48 hours depending on the set time of the concrete before being transported.

Question 5

In the volumetric method for air content (ASTM C173), which type of concrete is it specifically required for?

Accepted Answer

Lightweight or aggregate containing concrete

Answer

ASTM C173 volumetric method is required for lightweight concrete or concrete containing aggregates that react with the pressure method.

CCIL - Canadian Council of Independent Laboratories Practice Test