4. Following are the results of a field unit weight determination test on a soil with sand cone method: • Calibrated dry density of Ottawa sand = 1667 kg/m • Calibrated mas of Ottawa sand to fill the cone = 0.117 kg • Mass of jar + cone + sand (before use) = 5.78 kg • Mass of jar + cone + sand (after use) = 2.85 kg • Mass of moist soil from hole = 3.42 kg Moisture content of moist soil =13.6% Find the dry unit weight of the soil

Answer 4.7

Following are the results of a field unit-weight determination test performed on the same soil by means of the sand cone method: -Calibrated dry unit weight of Ottawa sand = 15.4019 kn/m3 -Calibrated weight of Ottawa sand to fill the cone = 5.3496 N -Weightof jar + cone + sand (before use) = 74.451 N -Weightof jar + cone + sand (after use) = 46.886 N -Weight of moist soil from hole = 29.509 N -Moisture content of moist soil = 10.21% DETERMINE AND SHOW COMPLETE SOLUTION 1. Dry density of compaction in the field in kg/cu.m.

Answer 4.8

A soil sample has a bulk unit weight of 17.9 kN/m^3 at a water content of 16.9%. Use Gs=2.57 Determine the porosity. Answer in TWO(2) decimal places. Numerical values only. Don't indicate units here, just on the submitted solution.

5. The following information is obtained from a sieve analysis to determine the range of particle sizes in a granular soil sample. Sieve Size          Sieve Opening (4.76)           Percent Finer#4                                    4.76                               96#10                                 2.00                               80#20                                  0.84                              51#40                                 0.42                               38#60                                0.25                                25#100                              0.149                              12#200                                0.074                             5 Present the information as grain-size curve on semi-logarithmic coordinates of percent finer against particle size diameter. From the plot, determine the uniformity coefficient Cu.

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During the completion of a construction project, a soil sample was taken from an area of compacted earth fill for a sand-cone in-place density test. The following were obtained from the results of the test: • Weight of sand used to fill the test hole and the funnel of the sand-cone device = 845 g • Weight of sand to fill the funnel of the sand-cone device = 323 g • Unit weight of sand = 15.71 kN/m3 • Weight of wet soil excavated from test hole = 622 g • Moisture content of the soil excavated from the test hole = 16% %3D %3D Calculate the dry unit weight (kN/m³) of the excavated material

Problem 1.2.1: The data below were obtained with tension device from two soils of unknown texture. Suction (en) 0 10 20 50 100 300 1000 10,000 20,000 100,000 Water content Soil A Soil B 44 44 43.9 38 22.5 12.5 7 5.2 5.1 4.9 52 52 52 31 48 32 20 13.5 13 128 Answer the following questions: 1. Which soil has a higher porosity? 2. What is the bulk density of the two samples? (Assume that the density of solids comprising both samples is ps = 2.65gm/cm³.) 3. What is estimated water content in the two samples at suction 15cm?