The behavior of cement stabilized sludge in East Lake
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Abstract:
This paper uses a combination treatment of cement, chemical stabilization and mechanical dehydration to stabilize the East Lake sludge. The effect of cement content, curing age and compaction degree on soil engineering properties has been researched by limit moisture test, strength test (including CBR and direct shear test) and permeability test. The results showed that the East Lake sludge stabilized by chemical stabilization and mechanical dehydration is high liquid limit silt with low CBR strength, and cannot meet the requirements of subgrade. Cement can effectively improve the CBR strength and cohesion of the secondary modified cement stabilized soil. Curing age contributes little to CBR strength. Cement content, curing age and compaction degree have little effect on internal friction angle. In addition, permeability coefficient increased at first and then decreased in the process of cement content increasing from 0% to 8%. The cement content is 2% when permeability coefficient reaches the maximum. According to the comprehensive analysis in the process of sludge modified by cement, the cement content should be 8%, and compaction degree should be more than 92% to meet the requirements of subgrade filling.
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