During compaction, with an increase in moisture content, the dry unit weight of

Question

During compaction, with an increase in moisture content, the dry unit weight of soil (a) always increases. (b) always decreases. (c) first increases, reaches a peak value, and then decreases. (d) remains unchanged. In the modified Proctor compaction test, the drop of the hammer is (a) 101.6 mm. (b) 304.8 mm. (c) 457.2 mm. (d) none of the above A compaction curve is plot of (a) bulk unit weight versus moisture content. (b) dry unit weight versus moisture content. (c) maximum dry unit weight versus optimum moisture content. (d) none of the above For a given moisture content. the theoretical maximum dry unit weight is obtained when degree of saturation is (a) 0%. (b) 25%. (c) 50%. (d) 100% As the compaction effort is increased. (a) both the maximum dry unit weight of compacted soil and the optimum moisture content are also increased. (b) both the maximum dry unit weight of compacted soil and the optimum moisture content are decreased. (c) the maximum dry unit weight of compacted soil is increased, and the optimum moisture content is decreased. (d) the maximum dry unit weight of compacted soil is decreased, and the optimum moisture content is increased. The standard Proctor compaction test is not suitable for (a) soils with particles of all sizes. (b) clayey soils. (c) silty soils. (d) sandy silty soils. Which of the following rollers is most effective in compacting clayey soils? (a) Smooth-wheel roller. (b) Pneumatic rubber-tired roller. (c) Sheep foot roller.

Explanation / Answer

1) Option C.

First dry unit weight increases then reaches maximum at optimum moisture content and the starts to decrease.

2) Option C.

The hammer drops from 18 inch height = 457.2 mm

3) Option B

Dry unit weight plotted on y axis and moisture content on x axis.

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