Concrete Batch Plant Operator Exam
FDOT
Who places the orders for concrete with the producer? - CORRECT ANSWER-The
contractor
The minimum normal sampling frequency for the chloride content of structural concrete
is: - CORRECT 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? -
CORRECT 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: - CORRECT ANSWER-Water
What is the weight of a bag of Portland cement in the USA? - CORRECT ANSWER-94
lbs
What is the maximum concrete temperature allowed when using a hot weather design
mix? - CORRECT ANSWER-100 degrees F
In concrete, which material has a specific gravity of one? - CORRECT ANSWER-Water
What is the air content range for all classes of structural concrete except Class IV
Shaft? - CORRECT ANSWER-1.00 thru 6.00%
When can unmetered water be added to the concrete? - CORRECT ANSWER-Not at
all.
Do not allow the total number of revolution at mixing speed to exceed: - CORRECT
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? - CORRECT
ANSWER-70 to 100
Stockpiles of aggregate shall be maintained in a well-drained condition in order to: -
CORRECT ANSWER-Minimize Free Water Content
FDOT
Who places the orders for concrete with the producer? - CORRECT ANSWER-The
contractor
The minimum normal sampling frequency for the chloride content of structural concrete
is: - CORRECT 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? -
CORRECT 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: - CORRECT ANSWER-Water
What is the weight of a bag of Portland cement in the USA? - CORRECT ANSWER-94
lbs
What is the maximum concrete temperature allowed when using a hot weather design
mix? - CORRECT ANSWER-100 degrees F
In concrete, which material has a specific gravity of one? - CORRECT ANSWER-Water
What is the air content range for all classes of structural concrete except Class IV
Shaft? - CORRECT ANSWER-1.00 thru 6.00%
When can unmetered water be added to the concrete? - CORRECT ANSWER-Not at
all.
Do not allow the total number of revolution at mixing speed to exceed: - CORRECT
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? - CORRECT
ANSWER-70 to 100
Stockpiles of aggregate shall be maintained in a well-drained condition in order to: -
CORRECT ANSWER-Minimize Free Water Content
