A fine-grained soil has 60% clay with LL 5 220%, PL 5 45%, a
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A fine-grained soil has 60% clay with LL 5 220%, PL 5 45%, and a natural water content of 6%. A standard Proctor test wa
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A fine-grained soil has 60% clay with LL 5 220%, PL 5 45%, and a natural water content of 6%. A standard Proctor test was carried out in the laboratory and the following data were recorded. Diameter of mold 101.40 mm Height of mold 116.70 mm Mass of mold 4196.50 grams Specifi c gravity, Gs 2.69 Unit weight Water content determination determination Mass of Mass of can and can and Mass Mass of wet soil wet soil dry soil of can and mold (grams) (grams) (grams) (grams) 6257 105.05 103.10 42.10 6356 100.69 97.90 40.90 6400 114.71 110.70 42.70 6421 134.26 128.50 42.50 6400 109.34 104.80 41.80 (a) Determine the maximum dry unit weight and optimum water content. (b) If the desired compaction in the fi eld is 95% of the standard Proctor test results, what values of dry unit weight and water content would you specify? Explain why you select these values. (c) What field equipment would you specify to compact the soil in the fi eld, and why? (d) How would you check that the specifi ed dry unit weight and water content are achieved in the field?
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