Compaction, in general, is (a) densification of soil by removal of water from th

Question

Compaction, in general, is (a) densification of soil by removal of water from the voids of the soil. (b) densification of soil by removal of air from the voids of the soil. (c) densification of soil by removal of both air and water from the voids of the soil. (d) movement of rollers over the soil subgrade. 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. The compaction energy per unit volume of soil used for the standard Proctor compaction test is (a) 591.3N-m/m_3 (b) 591.3kN-m/m_3. (c) 2696kN-m/m_3. (d) 2696N-m/m_3. If for a compacted soil bulk, unit weight is 18.3kN/m3, and moisture content is 12%, its dry unit weight will be (a) 16.3kN/m3. (b) 18.3kN/m3. (c) 20.5kN/m3. (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% If specific gravity of soil solids is 2.68, and the water content of soil is 10%, its zero-airvoid unit weight will be (a) 3.7kN/m3 (b) 7.1kN/m3 (c) 20.7kN/m3. (d) none of the above

Explanation / Answer

Correct answers are:

1 b)

2 c)

3 b)

4) Dry density = Bulk density/(1+water content)

= 18.3/(1+0.12)

= 16.3 kN/m3

correct option is a)

5) d

6) Zero airvoid unit weight = (2.68x9.81)/(1+2.68x0.1)

= 20.7 kN/m3

Correct option is (c)

  

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