PROBLEM 1 The results of a standard Proctor test are given in the following table. Mass of moist Moisture soil in the mold (kg) Trial Content (%) 1 1.47 10.0 2 1.83 12.5 3 2.02 15 4 1.95 17.5 1.73 20.0 1.69 22.5 After compaction the field unit weight of the soil is determined by means of the sand cone method, the following are the results: Calibrated dry density of Ottawa sand = 1731 kg/m3 Mass of Ottawa sand to fill the cone = 0.118 kg Mass of jar + cone + sand (before use) = 6.08 kg Mass of jar + cone + sand (after use) = 2.86 kg Mass of moist soil from the hole 3.34 kg Moisture content of moist soil = 12.1% %3D Determine the maximum dry unit weight (kN/m3) of compaction and the optimum moisture content. Given mold volume = 943.3 cm3. Note: Check the maximum а. %3D dry unit weight of compaction and the optimum moisture content using the graphical method and by means of the equation of the line. b. Determine the relative compaction in the field.

Consider that a 58.7 gram sample of dry soil is used in making a mechanical analysis by using the hydrometer method. The laboratory was held at a constant temperature of 20 C (68 F). The 40 s hydrometer reading was found to be 32.5 and the 8 hr hydrometer reading was 15.5. The percentage of sand in this soil sample is (note, a 58.7 gram sample is used here): Your Answer: Answer units

2. A sample of dry coarse - grained material of mass 500 g was shaken through a nest of sieves and the following results were obtained. a) Plot the particle size distribution curve. b) Determine the effective size, the average particle size, the uniformity coefficient and the coefficient of curvature. c) Determine the textural composition of the soil. Sieve No. Opening (mm) Mass retained (g) 4 10 20 40 100 200 Pan 4.75 2.00 0.85 0.425 0.15 0.075 0 14.8 98 90.1 181.9 108.8 6.1

SG is 2.66 and temperature is 18 degrees celcius