Concrete Batch Plant Operator Exam (FDOT)
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
, Concrete Batch Plant Operator Exam (FDOT)
Questions And Answers 2023
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.
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
, Concrete Batch Plant Operator Exam (FDOT)
Questions And Answers 2023
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.
