APA Precast Concrete Batch Plant Operator
Questions And Answers 2023
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
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 ...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
Questions And Answers 2023
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
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 ...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
