Concrete Batch Plant Operator Exam
(FDOT) question with answers
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.
-Who places the orders for concrete with the producer? - -The contractor
(FDOT) question with answers
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.
-Who places the orders for concrete with the producer? - -The contractor
