CCIL Concrete Field Testing Procedures 4

Question 1

Per ASTM C31, how soon after casting must concrete test cylinders be protected from vibration and disturbance?

Accepted Answer

Immediately after casting

Answer

Cylinders must be protected from vibration, shock, and disturbance immediately after casting until they are transported to the curing facility.

Question 2

What is the Kelly ball test used to evaluate in fresh concrete?

Accepted Answer

Consistency and workability

Answer

The Kelly ball test (ASTM C360, now withdrawn) measured the penetration depth of a weighted ball to assess concrete consistency as a slump alternative.

Question 3

When the ambient temperature exceeds 32°C (90°F), what additional precaution must be taken with freshly cast concrete cylinders?

Accepted Answer

Store in shade and cover with wet burlap

Answer

In hot weather, freshly cast specimens must be stored in a shaded location and protected with wet burlap or similar moisture-retaining covers to prevent thermal cracking.

Question 4

What is the correct procedure when the slump of concrete exceeds the maximum specified for the project?

Accepted Answer

Reject the load or notify the engineer

Answer

If test results fall outside specified limits, the load should be rejected or the engineer of record notified immediately for a disposition decision.

Question 5

Which ASTM standard governs the making and curing of concrete test specimens in the laboratory?

Accepted Answer

ASTM C192

Answer

ASTM C192 covers the procedure for making and curing concrete test specimens in the laboratory under controlled conditions.

CCIL - Canadian Council of Independent Laboratories Practice Test

CCIL - Canadian Council of Independent Laboratories Practice Test

CCIL Concrete Field Testing Procedures 4