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Effect of Acidic Leachate on the Cement-based Landfill Soil Liner System  

Cho, Jae-Beom (Department of Soil and Ground Water, Environmental Management Corporation)
Hyun, Jae-Hyuk (Department of Environmental Engineering, Chungnam National University)
Lee, Jong-Deuk (Department of Soil and Ground Water, Environmental Management Corporation)
Park, Joung-Ku (Department of Soil and Ground Water, Environmental Management Corporation)
Publication Information
Journal of Korean Society of Environmental Engineers / v.28, no.3, 2006 , pp. 265-269 More about this Journal
Abstract
This study was to investigate the effect of acidic leachate on the landfill liner system and healing of cracks by using industrial by-products; BFS(Blast Furnace Slag) and FA(Fly Ash). From the results of pH measurement, for OPC(Ordinary Portland Cement) and DM(Dredged Mud) mixtures immersed acidic leachate, the initial pH($4.5{\sim}5.5$) was heavily increased to approximately 10 after 60 days experiment due to the production of 2 mole $OH^-$ which was occurred by hydrolysis of CaO and MgO etc.. Meanwhile, the initial pH of acidic leachate immersed DM mixtures with BFS and FA respectively was lasted for longer period as compared to the comparison. The reason was that production of low Ca C-S-H hydrates which stabilized in acidic liquid. The physical properties(compressive strength, hydraulic conductivity) of DM mixtures added BFS and FA was improved. It was concluded that the dissolution of hydrates was disturbed by high alkalinity of BFS and FA.
Keywords
Blast Furnace Slag; Fly Ash; Dredged Mud;
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