Homework 1 - F2011 - 101 pcf. The specific gravity of...

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The University of Missouri Department of Civil Engineering Assigned: Friday, August 26, 2011 Due: Wednesday, August 31, 2011 CE 3400 – Fall 2011 Homework No. 1 – Weight-Volume Calculations 1. A cube of moist soil weighs 215 lb and has a volume of 2.00 ft 3 . Its moisture content is 25.0% and the specific gravity of solids is 2.70. Compute the void ratio, porosity, degree of saturation, and the unit weight of this soil. 2. A specimen of saturated soil has a water content of 145 percent and a total unit weight of 84 pcf. Find the void ratio and the specific gravity of solids. 3. A sand has a dry unit weight of 105 pcf and a specific gravity of solids of 2.65. What water content will give the sand a degree of saturation of 35 percent? 4. A particular soil has a total (moist) unit weight of 122 pcf and a dry unit weight of
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Unformatted text preview: 101 pcf. The specific gravity of solids is unknown; you may assume that it is 2.70. Calculate the water content and the degree of saturation. 5. A compacted fill is to be constructed to support a new highway. The fill material will be taken from a location (borrow pit) where the in-place dry unit weight is 105 pcf and the water content is 9%. The soil will be excavated from the borrow pit, moistened to increase the water content to 13.5% and then compacted to a final dry unit weight of 118 pcf. The total final volume of the compacted fill will be 250,000 yd 3 . a. How many cubic yards of soil must be excavated from the borrow pit? b. How many gallons of water must be added to the excavated soil to raise the water content to the proper value?...
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