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http://dx.doi.org/10.7843/kgs.2007.23.8.97

Effect of pH Level on the Characteristics of a Landfill Clay Liner Material  

Jung, Soo-Jung (Korea Infrastructure Safety & Technology Corporation)
Lee, Yong-Su (Dept. of Civil Engrg., Korea Maritime Univ.)
Kim, Tae-Hyung (Division of Civil and Environmental Engrg., Korea Maritime Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.23, no.8, 2007 , pp. 97-106 More about this Journal
Abstract
In this study, experiments are conducted to find out the effect of waste leachate on landfill clay liner system. Tensile test, hydrometer analysis and crack pattern test were conducted on sand-bentonite mixtures with different pH values of water. The tensile strength of specimen compacted with pH 9 of water is smaller than that of specimen compacted with for pH 3 and 6 of water. That is, the higher the pH value, the smaller the tensile strength, because a higher pH solution decreases flocculation phenomenon. The percent finer also increased with high pH value in particle size distribution of fine grained soil (<0.075 mm), because the velocity of particles settling decreases. This trend becomes the clearer as the content of bentonite, becomes the larger, because the higher pH value decreases flocculation structure of fine soils. The results of the crack pattern tests also showed the effect of pH values of water.
Keywords
Clay liner; Crack; pH; Sand-bentonite mixture; Waste leachate;
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