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Following statements are made on compacted soils, wherein DS stands for the soils compacted on dry side of optimum moisture content and WS stands for the soils compacted on wet side of optimum moisture content. Identify the incorrect statement.

Following statements are made on compacted soils, wherein DS stands for the soils compacted on dry side of optimum moisture content and WS stands for the soils compacted on wet side of optimum moisture content. Identify the incorrect statement. Correct Answer On drying, shrinkage is high on DS and low on WS.

Concept:

Dry of Optimum: When a soil is compacted at a moisture content which is less than the optimum moisture content (OMC) then the soil is said to be compacted dry of optimum.

Wet of Optimum: When a soil is compacted at a moisture content which is more than the optimum moisture content (OMC) then the soil is said to be compacted wet of optimum.

The above concepts are shown in the following diagram for better understanding:

The effect of compaction in dry of optimum and wet of optimum is shown in the following table:

Soil Property

Dry of Optimum

Wet of Optimum

Soil mineral structure

Flocculated clay structure, more random

Dispersed clay structure, more oriented

Pore Water pressure

Lower pore water pressure at low strains

Higher pore water pressure at low strains

Shrinkage

Less

More

Swell

More

Less

Permeability

More

Less

Strength

Higher

Lower

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