FDOT CONCRETE BATCH PLANT OPERATOR EXAM
Stockpiles of aggregate shall be maintained in a well-drained condition in order to: -
Answer -Minimize Free Water Content
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
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 - Answer -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: - Answer -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. - Answer -Is not allowed.
Who places the orders for concrete with the producer? - Answer -The contractor
The minimum normal sampling frequency for the chloride content of structural concrete
is: - Answer -1 per design mix in use from the first day of production and every 30
calendar days or less thereafter.
In what moister condition are the aggregates on the approved concrete mix designs? -
Answer -SSD condition
The specific gravity of an aggregate is the ratio of its unit weight to the weight of an
equal absolute volume of: - Answer -Water
What is the weight of a bag of Portland cement in the USA? - Answer -94 lbs
What is the maximum concrete temperature allowed when using a hot weather design
mix? - Answer -100 degrees F
For drill shaft concrete, the quantity of cement replaced with fly ash shall be: - Answer -
33 thru 37%
Stockpiles of aggregate shall be maintained in a well-drained condition in order to: -
Answer -Minimize Free Water Content
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
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 - Answer -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: - Answer -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. - Answer -Is not allowed.
Who places the orders for concrete with the producer? - Answer -The contractor
The minimum normal sampling frequency for the chloride content of structural concrete
is: - Answer -1 per design mix in use from the first day of production and every 30
calendar days or less thereafter.
In what moister condition are the aggregates on the approved concrete mix designs? -
Answer -SSD condition
The specific gravity of an aggregate is the ratio of its unit weight to the weight of an
equal absolute volume of: - Answer -Water
What is the weight of a bag of Portland cement in the USA? - Answer -94 lbs
What is the maximum concrete temperature allowed when using a hot weather design
mix? - Answer -100 degrees F
For drill shaft concrete, the quantity of cement replaced with fly ash shall be: - Answer -
33 thru 37%
