CCIL Concrete Compressive Strength Testing 4

Question 1

What is the maximum number of uses permitted for a neoprene pad cap before it must be retired per ASTM C1231?

Accepted Answer

50 uses

Answer

ASTM C1231 limits neoprene pad caps to a maximum of 100 uses; however, pads must be inspected after each test and discarded if they show excessive wear.

Question 2

A concrete cylinder breaks with a Type 5 fracture pattern (side fracture at top or bottom). What does this likely indicate?

Accepted Answer

Poor end condition or misalignment of the loading platen

Answer

Type 5 fractures typically result from poor end conditions, eccentric loading, or platen misalignment causing stress concentration at the specimen end.

Question 3

What is the required standard curing temperature range for concrete cylinders in the moist curing room or water storage tank per ASTM C31?

Accepted Answer

23°C ± 2°C (73°F ± 3.6°F)

Answer

ASTM C31 specifies standard moist curing at 23°C ± 2°C (73°F ± 3.6°F) in the curing room or water tank.

Question 4

When reporting compressive strength results per ASTM C39, to what nearest value should the result be rounded?

Accepted Answer

Nearest 10 psi (0.1 MPa)

Answer

ASTM C39 requires compressive strength results to be reported to the nearest 10 psi (0.1 MPa).

Question 5

Which information is NOT required to be reported with compressive strength test results per ASTM C39?

Accepted Answer

Name of the concrete mix designer

Answer

The mix designer's name is not a required data element in ASTM C39 reporting; specimen geometry, fracture pattern, and test age are required.

CCIL - Canadian Council of Independent Laboratories Practice Test

CCIL - Canadian Council of Independent Laboratories Practice Test

CCIL Concrete Compressive Strength Testing 4