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Review Quiz for Exam-2 (1
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Review Quiz for Exam-2 (1
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Review Quiz for Exam#2Following is NOT one of the differences between standard and modified Proctor test? (circle
one)
A. Modified test uses heavier rammer as compared to standard Proctor test
B. Modified test uses higher drop height as compared to standard Proctor test
C. Modified test uses more number of layers as compared to standard Proctor test
D. Modified test uses more number of blows as compared to standard Proctor test - ANS-D.
Modified test uses more number of blows as compared to standard Proctor test
Which field compaction method is best for clayey soils? (circle one)
A. Smooth wheeled roller
B. Sheepsfoot roller
C. Vibratory roller
D. None of the above - ANS-B. Sheepsfoot roller
A sheepsfoot roller compact soil by providing: (circle one)
A. Pressure and impact
B. Impact and kneading
C. Pressure and kneading
D. Pressure and vibration - ANS-C. Pressure and kneading
Capillary rise of water is the result of surface tension on the water and air interface. (circle one)
True
False - ANS-True
Consolidation is a quick process of rearrangement of soil particles to reduce air voids in the soil.
(circle one)
True
False - ANS-False
Which of the following four types of soils is the most frost susceptible soil as a foundation
material? (circle one)
A. clay
B. gravel
C. sand
D. silt - ANS-D. silt
Water in soils will influence compaction effectiveness with lubrication between soil particles, so
when you are supervising a soil compaction process, you should instruct the construction
workers to make the water content as high as possible.
True
, False - ANS-False
Compaction can increase soil's density by reducing the soil's solid weight through mechanical
densification.
True
False - ANS-False
After compaction, the wet (or total) density of a compacted highway base is 120 pcf, and its dry
density is 110 pcf. The soil report shows that the soil in the highway base has a maximum dry
density of 125 pcf. What is the % compaction achieved?
A.96%
B.88%
C.104% - ANS-B.88%
Which method is suitable for repair of structures with settlements?
A. Vibroflotation
B. Chemical stabilization
C. Grouting
D. Stone columns - ANS-C. Grouting
You are working on a road project and the schedule indicates that aggregate subbase is to be
installed in two weeks. You have also noticed that the subgrade soil conditions are such that
loaded triaxle trucks are leaving ruts in the silty soil. After reviewing your contract, you have
noticed that your company must provide a warranty for the pavement for 6 years. If these facts
were of concern, what soil improvement method would you recommend to your supervisor?
A. Vibroflotation
B. Chemical stabilization
C. Grouting
D. Stone columns - ANS-B. Chemical stabilization
Geotextiles can be used for: (circle one)
A. Separation
B. Filtration
C. Reinforcement
D. All of the above - ANS-D. All of the above
Which method of soil improvement is NOT suitable for cohesive soils?
A. Dynamic compaction
B. Preloading
C. Vibroflotation
D. Stone columns - ANS-C. Vibroflotation
A cofferdam (a temporary dam for construction purposes) is built across the mouth of a small
bay. It is 135 ft. in length and is underlain by a permeable sand layer as shown. Water seeps
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