3- A series of standard Proctor compaction tests were performed on soil and the obtained results are presented in Figure below. The volume of the standard mould was 1 x 103 m' and Gs = 2.65. 1.82 1.80 1.78 * 1.76 What is the degree of saturation of the sample compacted to the maximum dry density? Estimate the volume of air (in m3) in the sample compacted to 15% water content. The void ratio of this soil in its loosest state is 1.74 1.72 1.70 1.68 1.66 0.623. Estimate the relative density of the soil sample compacted to 11% water content? 10 11 12 13 14 15 16 17 18 19 20 21 22 Water content (%) Dry density (g cm-3)

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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.