SUBGRADE & BASE INSPECTION –
FDOT EXAM QUESTIONS WITH
COMPLETE SOLUTIONS
What is the time limit for placement of the central-plant mixture in adjacent passes? -
Answer-30 minutes
Is the dumping of soil-cement mixtures in piles or windrows on the subgrade
acceptable? - Answer-No
What should you use to check the depth of cement-treated subgrades? - Answer--
Smooth metal rod
-Jack
-Stringline
What tool should you use in checking for uniformity of mixing - Answer-Posthole digger
In a mixed, cement-treated subgrade, there should be no soil particles larger than __ -
Answer-1'' in diameter
For cement-treated subgrades, where are the maximum density and optimum moisture
values determined?
Who makes these determinations? - Answer--In the field
-Inspector
When is the earliest that compaction can be started after mixing has been completed?
___ When is the latest? ___ - Answer-Immediately; Not later than 60 minutes
Cement-treated subgrades must be compacted to at least __ percent of the maximum
density. - Answer-95
Areas of the subgrade that need additional soil-cement mixture in order to comply with
the plans must first be lightly __. - Answer-Scarified
Should cement-treated subgrade surface higher or lower from plan grade to be
corrected? - Answer-Yes
Cement-treated subgrades of up to 6-inch specified thickness must not have thickness
deficiencies greater than __ - Answer-1/2 inch
, How is moisture retained in the subgrade BEFORE asphalt is applied? - Answer-By
sprinkling
How long is the curing period? (Cement treated subgrades) - Answer-7 days
What three things should you verify during curing coat application? - Answer--
Application at a specified rate
-Complete uniform coverage
-Sanding of asphaltic material with acceptable aggregate
How many different kinds of base courses are included in the Standard Specifications? -
Answer-9
The purpose of a base course is to __. - Answer-Support the pavement
For tangent sections, the maximum interval for setting the stakes along the roadway is
__ feet. - Answer-50
Generally, grade stakes are offset __ feet from the edge of mixing operations. - Answer-
3
Are blue tops sometimes set after the base material is placed and balanced? - Answer-
Yes
Sometimes blue tops are covered by the construction operations. Why must they be
uncovered? - Answer-So that the motor grader operator can clip over the top
If you are to be the Base Inspector and did not inspect the subgrade operations, should
you assume the subgrade meets all the requirements? - Answer-No
Must spongy areas and ruts in the subgrade be corrected BEFORE the beginning of
base course operations? - Answer-Yes
Do the contract plans govern over the special provisions? - Answer-No
List three general requirements for all equipment used in subgrade operations: -
Answer--Be in good condition
-Operate safely
-Produce desired results
How are spread distances marked? - Answer-Stakes
A certain transport holds 42,360 pounds of cement. The design application rate is 30
pounds. The subgrade is 21 feet wide. What is the spread distance for this particular
transport? __ (to the nearest foot) - Answer-605 feet
FDOT EXAM QUESTIONS WITH
COMPLETE SOLUTIONS
What is the time limit for placement of the central-plant mixture in adjacent passes? -
Answer-30 minutes
Is the dumping of soil-cement mixtures in piles or windrows on the subgrade
acceptable? - Answer-No
What should you use to check the depth of cement-treated subgrades? - Answer--
Smooth metal rod
-Jack
-Stringline
What tool should you use in checking for uniformity of mixing - Answer-Posthole digger
In a mixed, cement-treated subgrade, there should be no soil particles larger than __ -
Answer-1'' in diameter
For cement-treated subgrades, where are the maximum density and optimum moisture
values determined?
Who makes these determinations? - Answer--In the field
-Inspector
When is the earliest that compaction can be started after mixing has been completed?
___ When is the latest? ___ - Answer-Immediately; Not later than 60 minutes
Cement-treated subgrades must be compacted to at least __ percent of the maximum
density. - Answer-95
Areas of the subgrade that need additional soil-cement mixture in order to comply with
the plans must first be lightly __. - Answer-Scarified
Should cement-treated subgrade surface higher or lower from plan grade to be
corrected? - Answer-Yes
Cement-treated subgrades of up to 6-inch specified thickness must not have thickness
deficiencies greater than __ - Answer-1/2 inch
, How is moisture retained in the subgrade BEFORE asphalt is applied? - Answer-By
sprinkling
How long is the curing period? (Cement treated subgrades) - Answer-7 days
What three things should you verify during curing coat application? - Answer--
Application at a specified rate
-Complete uniform coverage
-Sanding of asphaltic material with acceptable aggregate
How many different kinds of base courses are included in the Standard Specifications? -
Answer-9
The purpose of a base course is to __. - Answer-Support the pavement
For tangent sections, the maximum interval for setting the stakes along the roadway is
__ feet. - Answer-50
Generally, grade stakes are offset __ feet from the edge of mixing operations. - Answer-
3
Are blue tops sometimes set after the base material is placed and balanced? - Answer-
Yes
Sometimes blue tops are covered by the construction operations. Why must they be
uncovered? - Answer-So that the motor grader operator can clip over the top
If you are to be the Base Inspector and did not inspect the subgrade operations, should
you assume the subgrade meets all the requirements? - Answer-No
Must spongy areas and ruts in the subgrade be corrected BEFORE the beginning of
base course operations? - Answer-Yes
Do the contract plans govern over the special provisions? - Answer-No
List three general requirements for all equipment used in subgrade operations: -
Answer--Be in good condition
-Operate safely
-Produce desired results
How are spread distances marked? - Answer-Stakes
A certain transport holds 42,360 pounds of cement. The design application rate is 30
pounds. The subgrade is 21 feet wide. What is the spread distance for this particular
transport? __ (to the nearest foot) - Answer-605 feet
