AND MATERIALS REVIEW QUESTIONS
ANSWERS VERIFIED GUIDE
◉ Coarse aggregate stockpiles must be sprinkled for at lest how
many hours prior to batch for FDOT?
Answer: 24
◉ Free moisture of the aggregate means:
Answer: Moister on the surface of an aggregate that is above and
beyond the absorbed moister in the aggregate.
◉ If the moister test is done other than by the cook-out method, how
often shall the other methods be verified?
Answer: Each week
◉ For drill shaft concrete, the quantity of cement replaced with fly
ash shall be:
Answer: 33 thru 37%
◉ In concrete, which material has a specific gravity of one?
Answer: Water
, ◉ What is the air content range for all classes of structural concrete
except Class IV Shaft?
Answer: 1.00 thru 6.00%
◉ When can unmetered water be added to the concrete?
Answer: Not at all.
◉ Do not allow the total number of revolution at mixing speed to
exceed:
Answer: 160 Revolutions
◉ After all materials have been charged into the transit mixer drum,
the concrete must be mixed at how many revolutions at the plant
before leaving for the project?
Answer: 70 to 100
◉ When the water meters / scales are calibrated, prior to
production, at what frequency should they be checked there after?
Answer: 3 moths
◉ To what accuracy should the scales for weighing cement ,
pozzolan, slag and aggregates at the plant be maintained