Standard Proctor compaction test results on a sandy clay (35
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Standard Proctor compaction test results on a sandy clay (35% sand, 55% clay, and 10% silt), taken from a borrow pit, ar
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Standard Proctor compaction test results on a sandy clay (35% sand, 55% clay, and 10% silt), taken from a borrow pit, are given in the following table. Water content (%) 4.2 5.1 7.8 9.2 12 Dry unit weight (kN/m3) 16.9 18.1 19.6 19.5 18.5 The sandy clay in the borrow pit has a porosity of 65% and a water content of 5.2%. A highway embankment is to be constructed using this soil. (a) Specify the compaction (dry unit weight and water content) to be achieved in the field. Justify your specification. (b) How many cubic meters of borrow pit soil are needed for 1 cubic meter of highway fill? (c) How much water per unit volume is required to meet the specification? (d) How many truckloads of soil will be required for a 100,000-m3 highway embankment? Each truck has a load capacity of 22.5 m3 and regulations require a maximum load capacity of 90%. (e) Determine the cost for 100,000 m3 of compacted soil based on the following: Purchase and load borrow pit material at site, haul 2 km round-trip, and spread with 200 HP dozer 5 $15/m3; extra mileage charge for each km 5 $0.5/m3; round-trip distance 5 10 km; compaction 5 $1.02/m3.
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