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Analysis of Injection Efficiency for Cement Grouts by Model Test of Permeation in Soil  

Song, Young-Su (Geotech Engineering Corporation, Daewoo dio-valley)
Lim, Heui-Dae (Department of Civil Engineering, Chungnam National University)
Choi, Dong-Nam (Samsung C&T Corporation, Daechung E. Spilway Con.)
Publication Information
Economic and Environmental Geology / v.43, no.2, 2010 , pp. 177-184 More about this Journal
Abstract
When cement grout is used for waterproofing of grounds, important roles are played by fluidity, particle size and bleeding. The most important element which determines their characteristics is the water/cement ratio of grout. Moreover in order to improve the efficiency of soil permeation, micro cement with a smaller average diameter is used in addition to ordinary portland cement. Besides the mixing ratio and cement diameter, the condition of ground is also of fundamental importance in the efficiency of permeation. In order to evaluate grout in terms of permeation ability into ground, we need a field test of grounting, which is cost and time consuming. In this paper we present a laboratory test method in which the suitability and efficiency of grouts are simply and more practically tested. In Korea neither a test standard nor devices are available to simulate grouting in a laboratory. We devised a grout injection equipment in which grouting was reproduced in the same condition with different materials, and suggested a standard for the production of specimens. Our tests revealed that the efficiency of injection increases with the water/cement ratio. We also found that more efficiently injected is the grout with the order of decreasing size; MS8000, micro cement, and ultra fine cements, and colloidal super cement.
Keywords
cement grout; water/cement; pressure permeation test; injection; efficiency of permeation;
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