4. The results of a standard Proctor test are given in the following table. a. Determine the maximum dry density (kg/m3) of compaction and the optimum moisture content. Given mold volume 943.3 cm3. b. If specification calls for 97% relative compaction in the field, what would be the field dry density and the range of acceptable moisture content? Trial no. Mass of moist soil in the mold (kg) 1 1.47 2 1.83 2.02 1.95 1.73 1.69 3 4 5 6 Moisture content (%) 10.0 12.5 15.0 17.5 20.0 22.5

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Soil Compaction Test

Soil compaction is the major area of geotechnical engineering. Soil is composed of multiple pores present on its surface, while the soil is mainly composed of gravel, sand, rocks, etc. The arrangement of these rocks and gravels is such that they build up voids (spaces) between them, which allows spaces for the roots of the plants and crops to spread and absorb the required amount of nutrients. Soil compaction is a major problem primarily caused by human activities, micro-organisms, and other multiple factors.