CONCRETE BATCH PLANT OPERATOR TEST 2025/2026
QUESTIONS WITH ANSWERS TAGGED A+
✔✔ Stockpiles of aggregate shall be maintained in a well-drained condition in order to: -
✔✔Minimize Free Water Content
✔✔Coarse aggregate stockpiles must be sprinkled for at lest how many hours prior to
batch for FDOT? - ✔✔24
✔✔Free moisture of the aggregate means: - ✔✔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? - ✔✔Each week
✔✔For drill shaft concrete, the quantity of cement replaced with fly ash shall be: - ✔✔33
thru 37%
✔✔In concrete, which material has a specific gravity of one? - ✔✔Water
✔✔What is the air content range for all classes of structural concrete except Class IV
Shaft? - ✔✔1.00 thru 6.00%
✔✔When can unmetered water be added to the concrete? - ✔✔Not at all.
✔✔Do not allow the total number of revolution at mixing speed to exceed: - ✔✔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? - ✔✔70 to
100
✔✔When the water meters / scales are calibrated, prior to production, at what
frequency should they be checked there after? - ✔✔3 moths
✔✔To what accuracy should the scales for weighing cement , pozzolan, slag and
aggregates at the plant be maintained - ✔✔0.5% of maximum load normally handled
✔✔For concrete containing a water-reducing retarding admixture, in an agitator truck,
the maximum time for depositing the concrete shall not exceed: - ✔✔90 minutes
✔✔If a load of concrete has been rejected due to excessive slump, the concrete may
remain in the transporting vehicle to reduce the slump. - ✔✔Is not allowed.
QUESTIONS WITH ANSWERS TAGGED A+
✔✔ Stockpiles of aggregate shall be maintained in a well-drained condition in order to: -
✔✔Minimize Free Water Content
✔✔Coarse aggregate stockpiles must be sprinkled for at lest how many hours prior to
batch for FDOT? - ✔✔24
✔✔Free moisture of the aggregate means: - ✔✔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? - ✔✔Each week
✔✔For drill shaft concrete, the quantity of cement replaced with fly ash shall be: - ✔✔33
thru 37%
✔✔In concrete, which material has a specific gravity of one? - ✔✔Water
✔✔What is the air content range for all classes of structural concrete except Class IV
Shaft? - ✔✔1.00 thru 6.00%
✔✔When can unmetered water be added to the concrete? - ✔✔Not at all.
✔✔Do not allow the total number of revolution at mixing speed to exceed: - ✔✔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? - ✔✔70 to
100
✔✔When the water meters / scales are calibrated, prior to production, at what
frequency should they be checked there after? - ✔✔3 moths
✔✔To what accuracy should the scales for weighing cement , pozzolan, slag and
aggregates at the plant be maintained - ✔✔0.5% of maximum load normally handled
✔✔For concrete containing a water-reducing retarding admixture, in an agitator truck,
the maximum time for depositing the concrete shall not exceed: - ✔✔90 minutes
✔✔If a load of concrete has been rejected due to excessive slump, the concrete may
remain in the transporting vehicle to reduce the slump. - ✔✔Is not allowed.
