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What Is Compaction of soil? It is a ground improvement technique in which soil is densified through the external effort. As we all know that a soil in loose form has air entrapped between its particles when we do the compaction by external effort we are actually reducing the air voids in the soil by reducing the air voids some changes occur in soil which are really good for our project construction. Factors affecting degree of compaction: Soil type Compaction effort Moisture content Layer thickness Speed of roller No of roller passes Contact pressure Effect of Moisture Content, Soil type and Compaction effort on compaction of soil: At low water content, the soil is stiff and offers more resistance to compaction. As the water content is increased, the soil particles get lubricated The water act as a lubricant. The soil mass becomes more workable and the particles have closer packing.The dry density of the soil increases with an increase in the water content ti...