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hw1-soln-sp10 - water then drying the sample in an oven of...

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CE 467L Geotechnical Engineering Spring 2010 Homework 1: SOLUTION 1. What processes contribute to the surfaces of clay mineral particles being negatively charged (1.1)? Isomorphous substitution of ions of lower valency than silicon or aluminum; disassociation of hydroxyl ions; unsatisfied charges due to broken bonds at edges of particles. 2. Describe the difference between the flocculated and dispersed clay particle structures (1.1). These different structures result from different net interparticle forces during deposition. The dispersed structure refers to a face-to-face orientation between clay particles, which results if there is a net repulsion between particles during deposition. The flocculated structure refers to either edge-to-edge or edge-to-face orientations between particles, and results when there is a net attraction between particles during deposition. 3. Describe the procedure for water content, w , determination (1.5). Water content is determined by weighing a sample of soil, yielding the mass of solids plus
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Unformatted text preview: water, then drying the sample in an oven of 105 to 110 °C for 24 hours, and reweighing, yielding the mass of soil solids. The difference between the two masses is the mass of water. Water content is the mass of water divided by the mass of soil solids. 4. See attached 5. What is an “engineered fill”? How do they differ from “non-engineered” fills (1.6)? An engineered fill is a fill [a transported and manually deposited soil] in which the soil has been selected, placed and compacted to an appropriate specification, so as to achieve a particular engineering performance. Non-engineered fills are those that are placed without any regard for engineering function. percent finer (%) size (mm) Soil E Soil F Soil G Soil H 63 20 100 6.3 94 2 69 98 0.6 32 88 0.212 13 67 95 0.063 37 73 99 0.02 22 46 0.006 11 25 71 0.002 4 58 10 30 40 50 60 70 80 90 0.001 0.01 0.1 1 particle size (mm) % finer...
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