Investigation of Soil Suction in a Compacted Low-plasticity Clay

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Title: Investigation of Soil Suction in a Compacted Low-plasticity Clay
Author: Rorie, Dennis E
Advisors: Mohammed (Mo) Gabr, Committee Member
Roy H. Borden, Committee Chair
Shamimur Rahman, Committee Member
Abstract: The purpose of this research is to investigate soil suction in low density silty sands. Research has been performed to develop the Soil Water Characteristic Curves for both the drying and wetting phases. The research attempts to mimic the behavior of partially saturated soil compacted at various degrees of as-compacted water contents and with varying compactive efforts. Pressure plate tests (ASTM D 6836-02) were conducted on compacted specimens (brown silty-soil classified as a low plasticity clay,CL according to USCS) with as-compacted water contents of 4.8% and 11.6%, and as-compacted dry densities of 1.60 Mg⁄m3 and 1.78 Mg⁄m3. Specimens were tested under 0 and 100 kPa overburden pressure. Results showed that the air-entry value increased with increasing as-compacted water content and overburden pressure, respectively. Filter paper tests (ASTM 5298-03) for determining the matric suction were performed on compacted specimens ranging in as-compacted water content and dry density from 4.7% to 22%, and 1.53 Mg/m3 to 1.90 Mg⁄m3, respectively. Results showed that the matric suction was influenced more by the as-compacted water content then the as-compacted dry density. Collapse potential (ASTM D 5333-03) tests were conducted on specimens prepared to the same water contents and dry densities as the filter paper tests. Data showed that the collapse potential increases with decreasing as-compacted water content, and relative compaction due the change in structure that occurs from change in compaction conditions
Date: 2006-12-08
Degree: MS
Discipline: Civil Engineering

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