Abstract
Basic engineering properties including fluidity, breeding characteristics, unconfined compression strength and hydraulic conductivity are evaluated for soil-cement mixtures for diaphragm wall construction. The specific objective is to assess the effects of 1) adding three different recycled fine additives including foundry dust, concrete powder and gypsum-rich slag, and 2) mixing with seawater on these engineering properties. Although addition of these fine additives decreased the fluidity of soil-cement slurry, adding the appropriate amount of fine additives increased the unconfined compression strength and decreased the hydraulic conductivity of soil-cement mixture after 28 days aging. Furthermore, using seawater instead of fresh water can also improve the strength and hydraulic barrier performances of soil-cement mixture. These results verify the applicability of these recycled fine additives and seawater to soil-cement diaphragm wall construction.
