Experiment 3-Unit Weight
Experiment 3-Unit Weight
Experiment 3-Unit Weight
Engineering Properties of Soils Based on Laboratory Testing Prof. Krishna Reddy, UIC
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Test Procedure: (1) Extrude the soil sample from the cylinder using the extruder. (2) Cut a representative soil specimen from the extruded sample. (3) Determine and record the length (L), diameter (D) and mass (Mt) of the soil specimen. (4) Determine and record the moisture content of the soil (w). (See Experiment 1)
Engineering Properties of Soils Based on Laboratory Testing Prof. Krishna Reddy, UIC
22 (Note: If the soil is sandy or loose, weigh the cylinder and soil sample together. Measure dimensions of the soil sample within the cylinder. Extrude and weigh the soil sample and determine moisture content) Data Analysis: (1) (2) Determine the moisture content as in Experiment 1 Determine the volume of the soil sample
D 2L V= cm3 4
(3)
= g d
Engineering Properties of Soils Based on Laboratory Testing Prof. Krishna Reddy, UIC
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EXAMPLE DATA
Engineering Properties of Soils Based on Laboratory Testing Prof. Krishna Reddy, UIC
24 DENSITY (UNIT WEIGHT) DETERMINATION DATA SHEET Sample number: B-1, ST-1, 10-12 Soil description: Gray silty clay Mass of the soil sample (Mt): 125.20 grams Length of the soil sample (L): 7.26 cm Diameter of the soil sample (D): 3.41 cm Moisture content determination: Specimen number Moisture can and lid number MC = Mass of empty, clean can + lid (grams) MCMS = Mass of can, lid, and moist soil (grams) MCDS = Mass of can, lid, and dry soil (grams) MS = Mass of soil solids (grams) MW = Mass of pore water (grams) w = Water content, w% 1 15 7.83 13.43 12.69 4.86 0.74 15. 2 Date Tested: September 10, 2002
t =
d =
Ib ft 3
Ib ft 3
(Note: 62.4 is the conversion factor to convert density in g/cm3 to unit weight in lb/ft3)
Engineering Properties of Soils Based on Laboratory Testing Prof. Krishna Reddy, UIC
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Engineering Properties of Soils Based on Laboratory Testing Prof. Krishna Reddy, UIC
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DENSITY (UNIT WEIGHT) DETERMINATION DATA SHEET Sample number: Soil description: Mass of the soil sample (Mt): Length of the soil sample (L): Diameter of the soil sample (D): Moisture content determination: Specimen number Moisture can and lid number MC = Mass of empty, clean can + lid (grams) MCMS = Mass of can, lid, and moist soil (grams) MCDS = Mass of can, lid, and dry soil (grams) MS = Mass of soil solids (grams) MW = Mass of pore water (grams) w = Water content, w% Calculations: Date Tested:
Engineering Properties of Soils Based on Laboratory Testing Prof. Krishna Reddy, UIC