FDOT Subgrade & Base
Inspection Exam
Questions & Answers
Subgrade operations can be divided into two basic types. List them. - ANSWERS- Stabilization
-Cement Treatment
Which of the following vary according to the type of subgrade stabilization performed? -
ANSWERS__A. the type of finishing equipment
__(B). the method of determining compliance with the bearing requirements
__C. the use of commercial or local materials
__D. the depth to which the subgrade is stabilized
__E. the basis of payment for the work
The following description is for which type of subgrade stabilization? The Contractor may use
either commercial or local materials. He will not be paid separately for the stabilizing materials
he uses. The bearing value determinations are made by the L.B.R. Method. Type__ Stabilization.
- ANSWERSType B stabilization
On a curve, what is the maximum interval for setting the stakes along the roadway? -
ANSWERS25 feet
Who will set stakes for subgrade operations? - ANSWERSContractors Survey Party
What is the name for the stakes used to control line? - ANSWERSHubs
,Stakes help to maintain close control in checking the __ and __ of the subgrade. -
ANSWERSWidth ; Depth
Grade stakes may be referred to as __. - ANSWERSBlue tops
How is the exact line indicated on the hubs? - ANSWERSTucks set in hub tops
The embankment surface to be stabilized or treated must comply with the __ and __
requirements before the beginning of subgrade operations.
Who is responsible for verifying this compliance? - ANSWERSPlan ; Specification
Inspector
Before any stabilizing material is spread on the subgrade, the roadbed must be brought to a
plane approximately __ to the plan of the proposed finished subgrade surface. -
ANSWERSParallel
When cement-treated subgrade is constructed of central plant-mixed material, the underlying
roadbed must be __ when the material is spread. - ANSWERSMoist
Number the following documents according to governing order -- with 1 being the highest, 2
the next highest and so on:
__A. Contract Plans
__B. Supplemental Special Provisions
__C. Special Provisions
__D. Standard Specifications
__E. Supplemental Specifications - ANSWERS(_3_) A. Contract Plans
, (_1_) B. Supplemental Special Provisions
(_2_) C. Special Provisions
(_5_) D. Standard Specifications
(_4_) E. Supplemental Specifications
When the existing base material is to be incorporated into the subgrade, should it be used
before or after other stabilizing additives have been mixed in? - ANSWERSBefore
Who determines what material or combination of materials to use to obtain the required
bearing values? - ANSWERSContractor
Where will you find frequencies for sampling, sample sizes, etc.? - ANSWERSSampling, Testing,
& Reporting Guide
What kind and type of cement is used for cement-treated subgrade? - ANSWERSPortland
Cement Type I
If the water to be used in a cement-treatment job comes from a city's water supply, may it be
used without testing? - ANSWERSYes
What should you do if the water to be used comes directly from a free-flowing stream? -
ANSWERSObtain and submit sample for testing
The results of soil surveys are shown on __ and __ sheets in the plans. - ANSWERSSoil survey ;
Cross Section
Is sand-clay material an example of a local material that may be used in subgrade stabilization? -
ANSWERSYes
Inspection Exam
Questions & Answers
Subgrade operations can be divided into two basic types. List them. - ANSWERS- Stabilization
-Cement Treatment
Which of the following vary according to the type of subgrade stabilization performed? -
ANSWERS__A. the type of finishing equipment
__(B). the method of determining compliance with the bearing requirements
__C. the use of commercial or local materials
__D. the depth to which the subgrade is stabilized
__E. the basis of payment for the work
The following description is for which type of subgrade stabilization? The Contractor may use
either commercial or local materials. He will not be paid separately for the stabilizing materials
he uses. The bearing value determinations are made by the L.B.R. Method. Type__ Stabilization.
- ANSWERSType B stabilization
On a curve, what is the maximum interval for setting the stakes along the roadway? -
ANSWERS25 feet
Who will set stakes for subgrade operations? - ANSWERSContractors Survey Party
What is the name for the stakes used to control line? - ANSWERSHubs
,Stakes help to maintain close control in checking the __ and __ of the subgrade. -
ANSWERSWidth ; Depth
Grade stakes may be referred to as __. - ANSWERSBlue tops
How is the exact line indicated on the hubs? - ANSWERSTucks set in hub tops
The embankment surface to be stabilized or treated must comply with the __ and __
requirements before the beginning of subgrade operations.
Who is responsible for verifying this compliance? - ANSWERSPlan ; Specification
Inspector
Before any stabilizing material is spread on the subgrade, the roadbed must be brought to a
plane approximately __ to the plan of the proposed finished subgrade surface. -
ANSWERSParallel
When cement-treated subgrade is constructed of central plant-mixed material, the underlying
roadbed must be __ when the material is spread. - ANSWERSMoist
Number the following documents according to governing order -- with 1 being the highest, 2
the next highest and so on:
__A. Contract Plans
__B. Supplemental Special Provisions
__C. Special Provisions
__D. Standard Specifications
__E. Supplemental Specifications - ANSWERS(_3_) A. Contract Plans
, (_1_) B. Supplemental Special Provisions
(_2_) C. Special Provisions
(_5_) D. Standard Specifications
(_4_) E. Supplemental Specifications
When the existing base material is to be incorporated into the subgrade, should it be used
before or after other stabilizing additives have been mixed in? - ANSWERSBefore
Who determines what material or combination of materials to use to obtain the required
bearing values? - ANSWERSContractor
Where will you find frequencies for sampling, sample sizes, etc.? - ANSWERSSampling, Testing,
& Reporting Guide
What kind and type of cement is used for cement-treated subgrade? - ANSWERSPortland
Cement Type I
If the water to be used in a cement-treatment job comes from a city's water supply, may it be
used without testing? - ANSWERSYes
What should you do if the water to be used comes directly from a free-flowing stream? -
ANSWERSObtain and submit sample for testing
The results of soil surveys are shown on __ and __ sheets in the plans. - ANSWERSSoil survey ;
Cross Section
Is sand-clay material an example of a local material that may be used in subgrade stabilization? -
ANSWERSYes
