Subgrade & Base Inspection – FDOT
Exam Questions with Complete
Solutions
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
What should you collect from each cement transport as it arrives at the job? - Answer-
Delivery ticket
Cement should NOT be spread:
__A. during rain
__B. at steady air temperature of 35 degrees Fahrenheit
__C. in high winds
__D. at the design application rate - Answer-(__A.) during rain
(__B.) at steady air temperature of 35 degrees Fahrenheit
(__C.) in high winds
__D. at the design application rate
When cement treatment follows lime treatment, what minimum amount of time should
pass between the completion of the lime treatment and the beginning of the cement
treatment? - Answer-7 days
A canvas check of the cement spread is performed. The canvas plus cement weigh
38.8 pounds. The canvas alone weighs 4.5 pounds. What is the application rate? -
Answer-34.3 lbs/ sq. yd
When possible, the entire subgrade width should be mixed in:
__A. three or more passes
__B. a single operation
__C. five minutes
__D. a central plant - Answer-__A. three or more passes
(__B.) a single operation
, __C. five minutes
__D. a central plant
May subgrade mixing be done to full depth in one course -- if mixing and density
requirements can be met? - Answer-Yes
Normally, mixing must begin within __ after the cement is spread. - Answer-30
What can be done to the subgrade whenever the moisture content exceeds the
specified level? - Answer-It can be aerated by remixing or blending
By the central plant method, all the materials must be mixed for at least - Answer-30
seconds
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
Exam Questions with Complete
Solutions
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
What should you collect from each cement transport as it arrives at the job? - Answer-
Delivery ticket
Cement should NOT be spread:
__A. during rain
__B. at steady air temperature of 35 degrees Fahrenheit
__C. in high winds
__D. at the design application rate - Answer-(__A.) during rain
(__B.) at steady air temperature of 35 degrees Fahrenheit
(__C.) in high winds
__D. at the design application rate
When cement treatment follows lime treatment, what minimum amount of time should
pass between the completion of the lime treatment and the beginning of the cement
treatment? - Answer-7 days
A canvas check of the cement spread is performed. The canvas plus cement weigh
38.8 pounds. The canvas alone weighs 4.5 pounds. What is the application rate? -
Answer-34.3 lbs/ sq. yd
When possible, the entire subgrade width should be mixed in:
__A. three or more passes
__B. a single operation
__C. five minutes
__D. a central plant - Answer-__A. three or more passes
(__B.) a single operation
, __C. five minutes
__D. a central plant
May subgrade mixing be done to full depth in one course -- if mixing and density
requirements can be met? - Answer-Yes
Normally, mixing must begin within __ after the cement is spread. - Answer-30
What can be done to the subgrade whenever the moisture content exceeds the
specified level? - Answer-It can be aerated by remixing or blending
By the central plant method, all the materials must be mixed for at least - Answer-30
seconds
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
