WorksheetsDay 77-Dec 12-worksheet-Btech-Compaction
Total questions: 15
Worksheet time: 9mins
Zero air-void line corresponds to:
80% saturation line
100% saturation line
Modified Proctor curve
Standard Proctor curve
Which soil generally shows maximum dry density on compaction?
Poorly graded clay
Uniform fine sand
Well-graded sand
Organic silt
Roller most suitable for compacting clayey soil in the core of an earthen dam:
Smooth wheel roller
Sheep foot roller
Vibratory roller
Pneumatic-tyred roller
Technique best suited for densifying very loose sandy soil below water table:
Vibro-floatation
Ramming
Sheep foot compaction
Blasting
Effect of increasing compaction effort on Proctor curve:
OMC increases, MDD decreases
OMC decreases, MDD increases
OMC and MDD both increase
OMC and MDD both decrease
A soil compacted on the wet side of OMC generally has:
Flocculated structure and high strength
Dispersed structure and low strength
Flocculated structure and low shrinkage
Compaction mainly increases soil density by expelling pore water from the voids.
True
False
The process of compaction primarily expels ______ from the soil.
air
water
clay
organic matter
Optimum moisture content (OMC) is the water content corresponding to maximum ______.
dry density
void ratio
particle size
plasticity index
On the dry side of OMC, the soil structure of clays is usually ______.
flocculated
dispersed
crystalline
laminated
On the wet side of OMC, the soil structure of clays is usually ______.
flocculated
dispersed
granular
cemented
Sheep-foot rollers compact soil mainly by ______ action.
kneading
vibrating
cutting
washing
Density Index (ID) is primarily used to describe the state of ______ soils.
cohesionless
cohesive
organic
expansive
In a laboratory Standard Proctor test, a soil gave a maximum dry density (ydmax_lab) of 18.5 kN/m³. In the field, the compacted fill of the same soil shows a dry density (yd_field) of 16.8 kN/m³. Compute the relative compaction Rc.
(a)
A soil has specific gravity of solids G = 2.70, water content w = 12%, and unit weight of water γw = 9.81 kN/m³. Calculate the theoretical dry density on the zero air-void line (100% saturation line) at this water content.
(a)
