The relative compaction of a sand in the field is 94%. The maximum and minimum dry unit weights of the sand are yd(max) = 16.2 kN/m3 and yd(min) = 14.9 kN/m3. For the field conditions; a) Compute the relative density of compaction. b) Determine the dry unit weight. c) Compute the moist unit weight at a moisture content of 8%.
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- The relative compaction of a 4-m thick sand in the field is 79.34% and moisture content of 10.44%. The maximum and minimum dry unit weights of the sand are 108.66 lb/ft3 and 63.41 lb/ft3, respectively. If the specific gravity of the sand in the field is 2.644, determine the following: a. Bulk unit weight of the soil in the field, in lb/ft3. b. Relative density in the field, in %. c. Thickness of sand to satisfy a compaction requirement in the site to about 95%.8. The max and min dry unit weights of the sand were determined in the laboratory to be 16.5 kN/m3 and 14.6 kN/m3 respectively. The relative density of compaction in the field of the same sand is 70%. What is the relative compaction? (Ans: 96%) What is the dry unit weight? (Ans: 15.84 kN/m3 ) What is the moist unit weight at a moisture content of 10%. (Ans: 17.42 kN/m3 )The maximum and minimum dry unit weights of a sand were determined in the laboratory to be 16.9 kN/m³ and 14.2 kN/m³, respectively. If the field relative density is 82%? Determine The degree of compaction in the field. Field dry unit weight. Field bulk unit weight if the field moisture content is 15%.
- 6. The maximum dry unit weight determined in the laboratory for a quart sand is 102 lb/ft3. In the field, the relative compaction is 90%. Specific Gravity of Sand is 2.70. Determine the void ratio at the maximum dry unit weight condition. Determine the void ratio of the sand in the field condition. Determine the hydraulic conductivity of the sand in the field condition if the hydraulic conductivity of the sand at the maximum dry unit weight condition is 0.30 cm/sec. Using Kozeny-Carman equation.6 Problem: The max. dry unit weight determined in the laboratory for a quart sand is 102 lb/ft3. In the field, the relative compaction is 90%. Specific gravity of sand is 2.70. a) Determine the void ratio at the max. dry unit weight condition. Determine the void ratio of the sand in b) the field condition.A. The maximum and minimum dry unit weights of a sand were determined in the laboratory to be 104 lb/ft and 93 lb/ft, respectively. What would be the relative compaction in the field if the relative density is 78%? Q1 B. Given Gs = 2.65, calculate the zero-air-void unit weight for a soil in lb/ft at W = 10%.
- 15. The relative compaction of a sand in the field is 94%. The max and min dry unit weights of the sand are 16.2 kN/m³ and 14.9 kN/m³, respectively. a. Compute the dry unit weight in the field. b. For field conditions, compute the relative density of compaction.7. The relative compaction of a sand in the field is 94%. Given that dry unit weight max = 16.2 kN/m3 and dry unit weight min = 14.9 kN/m3 . For the field conditions. What is the relative density compaction? (Ans: 27%) What is the dry unit weight? (Ans: 15.23 kN/m3) What is the moist unit weight at a moisture content of 10%? (Ans: 16.45 kN/m3 )A certain saturated sand (S = 100%) has a moisture content of 27.9% and a specific gravity of solids of 2.61. It also has a maximum index void ratio of 0.90 and a minimum index void ratio of 0.33. Compute its relative density and classify its consistency. (Table on the right) Solution: Given the values of mmoisture content, specific gravity and degree of saturation, the void ratio can be estiamted as: e = Thus the relative density is found to be Dr = • According to the table, the soil is classified as %; soil. TABLE 3.3 CONSISTENCY OF COARSE-GRAINED SOILS AT VARIOUS RELATIVE DENSITIES (data from Lambe and Whitman, 1969) Relative Density, D,(%) 0-15 15-35 35-65 65-85 85-100 Classification Very loose Loose Medium denseª Dense Very dense "Lambe and Whitman used the term "medium," but "medium dense" is better because "medium" usually refers to the particle size distribution.
- A loose, uncompacted sand fill 1.8m in depth has a relative densityof 40%. Laboratory tests indicated that the minimum and maximum voidratios of the sand are 0.46 and 0.90, respectively. The specificgravity of solids of the sand is 2.65.a. What is the dry unit weight of the sand?b. If the sand is compacted to a relative density of 75%, whatis the decrease in thickness of the 1.8m fill?1. A wet sand sample has a volume of 4.64 x 10⁻⁴ and weighs 8N. After oven drying, the weight reduces to 7.5N. Calculate the water content, void ratio and degree of saturation.(use Gs = 2.7) 2. A contractor has compacted the base course for a new road and found that the mean value of the test sample shows, w = 14.6%, Gs =2.81, and γ= 18.2 KN/m³. The specification require thate ≤0.8. has the contractor complied with the specifications? 3. The moist unit weight of soil is 16.5 KN/m³. Given that the w=15% and Gs = 2.70. Find:1) dry unit weight2) porosity3) degree of saturation2. A specimen (50 mm diameter and 100 mm height) of moist sand weights 3.31 N. Its dry weight is 3.0 N and the specific gravity of the solids is 2.65. Given the maximum and the minimum void ratio of the sand emax = 1.05 and emin = 0.65, respectively. (a) Determine the relative density of the sand. (b) Calculate the saturated unit weight and the effective (or buoyant) unit weight of the sand. (c) Use your own words to describe the meaning of effective (or buoyant) unit weight of the soil.