Concrete Batch Plant Operator Exam
(FDOT) Questions And Answers
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
, The minimum normal sampling frequency for the chloride content of structural concrete is:
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? SSD
condition
The specific gravity of an aggregate is the ratio of its unit weight to the weight of an equal
absolute volume of: Water
What is the weight of a bag of Portland cement in the USA? 94 lbs
What is the maximum concrete temperature allowed when using a hot weather design mix?
100 degrees F
Who is responsible for signing the FDOT delivery ticket at the concrete plant? The FDOT
qualified batch plant operator
The number of mixing revolutions at mixing speed, at the plant will be recorded on the delivery
ticket: Before leaving for the jobsite
When filling out the information for aggregates on the delivery ticket, which of the following is
NOT required? The target weight of the aggregate batch.
(FDOT) Questions And Answers
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
, The minimum normal sampling frequency for the chloride content of structural concrete is:
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? SSD
condition
The specific gravity of an aggregate is the ratio of its unit weight to the weight of an equal
absolute volume of: Water
What is the weight of a bag of Portland cement in the USA? 94 lbs
What is the maximum concrete temperature allowed when using a hot weather design mix?
100 degrees F
Who is responsible for signing the FDOT delivery ticket at the concrete plant? The FDOT
qualified batch plant operator
The number of mixing revolutions at mixing speed, at the plant will be recorded on the delivery
ticket: Before leaving for the jobsite
When filling out the information for aggregates on the delivery ticket, which of the following is
NOT required? The target weight of the aggregate batch.
