VDOT Soils and Aggregate Compaction Exam ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
with verified detailed answers ||//\\|| ||//\\|| ||//\\||
Gravel Sieve - correct answer✔✔#3-#10 ||//\\|| ||//\\|| ||//\\|| ||//\\||
Sand Sieve - correct answer✔✔#10-#200
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Fines Sieve - correct answer✔✔#200+
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Size - correct answer✔✔Described by particle or grain diameter or average dimension.
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Shape - correct answer✔✔The shape of the grains larger than .06 inches is inditingusable to
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
the naked eye||//\\|| ||//\\||
Surface Texture - correct answer✔✔Refers to the degree of fineness and uniformity of a soil.
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Surface Forces - correct answer✔✔fine grained platey soils, electrical forces on the surface
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of the grains. important of how they react with water
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Consistancy - correct answer✔✔texture and firmness of soil ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
Cohesion - correct answer✔✔The mutual attraction of particles due to molecular forces and
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
the present of moisture films
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Sensisitvity - correct answer✔✔a characteristic of clays that describes the lose of strngth ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
after disturbance ||//\\||
, moisture content - correct answer✔✔how much moisture is in the void spaces ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
Why are dense grades used more for aggregate bases - correct answer✔✔bc the dense
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
gradation provides more strength by filling voids ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
If the soils is 100 percent saturated and the voids are full of water and has a high MC -
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
correct answer✔✔large void spaces and is loosely compacted
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If the soils is 100 percent saturated and has low MC - correct answer✔✔small voids and is
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
compact
in the field: the soil moisture is near the liquid limit - correct answer✔✔a lot of settlement
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is likely
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in the field: the soil moisture is near the plastic limit - correct answer✔✔not a lot of
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settlement is likely ||//\\|| ||//\\||
Compaction Percent - correct answer✔✔(field dry density/ Max Theoretical Density)*100 ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
Does a silty sand or clayey soil require more moisture control - correct answer✔✔silty sand
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
What are reasons for unexpected density changes - correct answer✔✔temp, lift thickness,
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
less than 95 percent compaction, more compactive effort, moisture control, change in
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
material
Bridging vs geofabric - correct answer✔✔bridging is when you overfill a swampy area to be
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
able to move across, geofabric is placed between swamp and bridge to keep the moisture
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out
with verified detailed answers ||//\\|| ||//\\|| ||//\\||
Gravel Sieve - correct answer✔✔#3-#10 ||//\\|| ||//\\|| ||//\\|| ||//\\||
Sand Sieve - correct answer✔✔#10-#200
||//\\|| ||//\\|| ||//\\|| ||//\\||
Fines Sieve - correct answer✔✔#200+
||//\\|| ||//\\|| ||//\\|| ||//\\||
Size - correct answer✔✔Described by particle or grain diameter or average dimension.
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
Shape - correct answer✔✔The shape of the grains larger than .06 inches is inditingusable to
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
the naked eye||//\\|| ||//\\||
Surface Texture - correct answer✔✔Refers to the degree of fineness and uniformity of a soil.
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
Surface Forces - correct answer✔✔fine grained platey soils, electrical forces on the surface
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
of the grains. important of how they react with water
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
Consistancy - correct answer✔✔texture and firmness of soil ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
Cohesion - correct answer✔✔The mutual attraction of particles due to molecular forces and
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
the present of moisture films
||//\\|| ||//\\|| ||//\\|| ||//\\||
Sensisitvity - correct answer✔✔a characteristic of clays that describes the lose of strngth ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
after disturbance ||//\\||
, moisture content - correct answer✔✔how much moisture is in the void spaces ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
Why are dense grades used more for aggregate bases - correct answer✔✔bc the dense
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
gradation provides more strength by filling voids ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
If the soils is 100 percent saturated and the voids are full of water and has a high MC -
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
correct answer✔✔large void spaces and is loosely compacted
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
If the soils is 100 percent saturated and has low MC - correct answer✔✔small voids and is
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
compact
in the field: the soil moisture is near the liquid limit - correct answer✔✔a lot of settlement
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
is likely
||//\\||
in the field: the soil moisture is near the plastic limit - correct answer✔✔not a lot of
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
settlement is likely ||//\\|| ||//\\||
Compaction Percent - correct answer✔✔(field dry density/ Max Theoretical Density)*100 ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
Does a silty sand or clayey soil require more moisture control - correct answer✔✔silty sand
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
What are reasons for unexpected density changes - correct answer✔✔temp, lift thickness,
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
less than 95 percent compaction, more compactive effort, moisture control, change in
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
material
Bridging vs geofabric - correct answer✔✔bridging is when you overfill a swampy area to be
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
able to move across, geofabric is placed between swamp and bridge to keep the moisture
||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\|| ||//\\||
out
