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EXPERIMENT 1 WATER CONTENT DETERMINATION BY GRAVIMETRIC METHODS Purpose: This test is performed to determine the water (moisture) content of soils. The water content is the ratio, expressed as a percentage, of the mass of “pore” or “free” water in a given mass of soil to the mass of the dry soil solids. Standard Reference: ASTM D 2216 – Standard Test Method for Laboratory Determination of Water (Moisture) Content of Soil, Rock, and Soil-Aggregate Mixtures Significance: For many soils, the water content may be an extremely important index used for establishing the relationship between the way a soil behaves and its properties. The consistency of a fine-grained soil largely depends on its water content. The water content is also used in expressing the phase relationships of air, water, and solids in a given volume of soil. Equipment: Drying oven, Balance, Moisture can, Gloves, Spatula. Test Procedure: (1) Record the moisture can and lid number. Determine and record the mass of an empty, clean, and dry moisture can with its lid (MC) (2) Place the moist soil in the moisture can and secure the lid. Determine and record the mass of the moisture can (now containing the moist soil) with the lid (MCMS). (3) Remove the lid and place the moisture can (containing the moist soil) in the drying oven that is set at 105°C. Leave it in the oven overnight. (4) Remove the moisture can. Carefully but securely, replace the lid on the moisture can using gloves, and allow it to cool to room temperature. Determine and record the mass of the moisture can and lid (containing the dry soil) (MCDS). (5) Empty the moisture can and clean the can and lid. Data Analysis: (1) Determine the mass of soil solids. 𝑀𝑆 = 𝑀𝐶𝐷𝑆 − 𝑀𝑆𝐶 (2) Determine the mass of pore water. 𝑀𝑊 = 𝑀𝐶𝑀𝑆 − 𝑀𝐶𝐷𝑆 (3) Determine the water content. 𝑤= 𝑀𝑤 𝑀𝑠 𝑥 100 WATER CONTENT DETERMINATION BY GRAVIMETRIC METHODS DATA SHEET Date Tested: Tested By: Project Name: Sample Number: Sample Description: 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 2 REFERENCES Krishna Reddy (2002). Engineering Properties of Soils Based on Laboratory Testing. Department of Civil and Materials Engineering. University of Illinois at Chicago. Date Tested: 1/12/18 Tested By: Brendan & Ibrahon Project Name: Sample Number: Sample Description: checked anlu/18 @ 10 a Left for 24+ hours Specimen number 1 2 Moisture can and lid number G-1-2 GHI 0.020 kg 0.0zolg 0₂ 042 /0,042 0.042 0.042 Mc = Mass of empty, clean can + lid (grams) MCMS = Mass of can, lid, and moist soil (grams) Mcps = Mass of can, lid, and dry soil (grams) Ms = Mass of soil solids (grams) Mw = Mass of pore water (grams) w = Water content, w% 0.022 0.022 0 O o O a Empty the pycnometer and clean it. Then fill it with distilled water (7) only (to the mark). Clean the exterior surface of the pycnometer with a clean, dry cloth. Determine the weight of the pycnometer and distilled water, WA. 2 2 르 340 Empty the pycnometer and clean it. (8) 2 은 Data Analysis: Calculate the specific gravity (G) of the soil solids using the following formula: G W. W. + (WA – WB) = where Wo is the weight of sample of oven-dry soil, g = Wps – Wp Wa is the weight of pycnometer filled with water WB is the weight of pycnometer filled with water and soil 2 Wo = g = 1624 – 1523 Wo = ga =9= 3664-126608 = w.lo = 10.1 10.1 os W.1+(340.4- 3 98.4) G= 1016 418 10.64(2993.-933.0) = 3.65
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