(a) (5 pts) How do the following parameters for a clay soil vary with increasing
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Question
(a) (5 pts) How do the following parameters for a clay soil vary with increasing compaction energy in laboratory (Proctor) compaction tests (circle one)? INCREASES INCREASES INCREASES INCREASES S at w Wopt INCREASES DECREASES DECREASES DECREASES DECREASES DECREASES ABOUT THE SAME ABOUT THE SAME ABOUT THE SAME ABOUT THE SAME ABOUT THE SAME Yd max: opt- e: (b) (6 pts) Explain why a compaction curve for a clay soil exhibits a bell shape. (o) (4 pts) What are four factors that influence the level of compaction energy applied to a soil during compaction in the field 5. (6 points) What is isomorphous substitution, and how does it influence the behavior of clay minerals?Explanation / Answer
a) dry density---increases
Wopt------decrases
e------same
Gs---increases
S--about the same
The effect of increasing the amount of compactive effort is to increase the maximum dry density,and to decrease the optimum water content.At a water content less than the optimum,the effect of increased compaction is more predominant.At a water content more than the optimum the volume of air voids becomes almost constant and the effect of increased compaction is not significant.But the max.dry density does not go on increasing with an increase in compactive effort.
b)
Dry density is increasing with an increase in water content After reaching certain point you are absorbing that the dry density keeps falling with an increase in water content. This line we said that zero air voids line or 100 percent saturation line.This point as at which maximum density exists is called the maximum dry density of a given soil and the corresponding water content is termed as the optimum water content or optimum moisture content
c)
A number of factors will affect the degree of compaction that can be achieved:
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