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http://dx.doi.org/10.4334/JKCI.2015.27.4.419

An Experimental Study on the Optimum Mix Design and Site Application Case of Soil Mixing Wall for Trench Stability  

Kwon, Yeong-Ho (Dept. of Architecture and Fire Service Administration, Dong Yang University)
Publication Information
Journal of the Korea Concrete Institute / v.27, no.4, 2015 , pp. 419-426 More about this Journal
Abstract
The purpose of this study is to investigate experimentally the optimum mix design and site application case of soil mixing wall (SMW) method which is cost-effective technique for construction of walls for cutoff wall and excavation support as well as for ground improvement before constructing LNG storage tank typed under-ground. Considering native soil condition in site, main materials are selected ordinary portland cement, bentonite as a binder slurry and also it is applied $1,833kg/m^3$ as an unit volume weight of native soil, Variations for soil mixing wall are as followings ; (1) water-cement ratio 4cases (2) mixing velocity (rpm) 3levels (3) bleeding capacity and ratio, compressive strength in laboratory and site application test. As test results, bleeding capacity and ratio are decreased in case of decreasing water-cement ratio and increasing mixing velocity. Required compressive strength (1.5 MPa) considering safety factors in site is satisfied with the range of water-cement ratio 150% below, and test results of core strength are higher than those of specimen strength in the range of 8~23% by actual application of element members including outside and inside in site construction work. Therefore, optimum mix design of soil mixing wall is proposed in the range of unit cement $280kg/m^3$, unit bentonite $10kg/m^3$, water-cement ratio 150% and mixing velocity 90rpm and test results of site application case are satisfied with the required properties.
Keywords
excavation support; cutoff wall; bentonite; mixing velocity; bleeding ratio; rpm;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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