Concrete Field Inspector Flashcards
7 cards from real CTQP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Concrete Field Inspector flashcards as text
When measuring the slump of a concrete sample, where is the measurement taken?
Answer: From the original center of the top of the concrete to the displaced center
The slump is measured as the vertical distance between the original center of the top of the concrete and the displaced center after the cone is removed.
Which supplementary cementitious material (SCM) is a byproduct of burning coal in electric power plants?
Answer: Fly ash
Fly ash is a byproduct collected from the flue gases of coal-burning power plants and is commonly used as an SCM in concrete.
What is the maximum time allowed between obtaining the composite sample and completing the slump test per ASTM C172?
Answer: 5 minutes
ASTM C172 requires that testing begin within 5 minutes of obtaining the composite sample to ensure representative results.
Which type of curing method is generally considered most effective for concrete flatwork?
Answer: Burlap kept continuously wet with water
Wet burlap (or similar wet coverings) maintained continuously moist is widely regarded as the most effective method because it provides constant moisture without allowing drying cycles.
A concrete inspector notices the truck drum is revolving at agitating speed rather than mixing speed on arrival. What is the implication?
Answer: There is no issue since agitating maintains mix quality indefinitely
Agitating speed is for maintaining a mixed load in transit, not for initial mixing — if mixing was incomplete, the load may be non-uniform.
When fabricating concrete test cylinders, how soon must they be transported to the lab after initial curing per ASTM C31?
Answer: Between 16 and 32 hours after casting
ASTM C31 requires cylinders to be transported to the laboratory between 16 and 32 hours after casting for standard curing.
What is the minimum number of test cylinders that should be cast per ASTM C31 for a standard compressive strength test set at 28 days?
Answer: 2
A strength test result is the average of at least two cylinders made from the same composite sample and tested at the same age.