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A Study on the pH Reduction of Controlled Low Strength Material with Coal Ash  

Kim, Youngil (한양대학교 대학원 건설환경공학과)
Jee, Sunghyun (한양대학교 대학원 건설환경공학과)
Chun, Byungsik (한양대학교 건설환경공학과)
Publication Information
Journal of the Korean GEO-environmental Society / v.11, no.9, 2010 , pp. 39-45 More about this Journal
Abstract
Controlled low strength material(CLSM) is produced by mixing portland cement, fine aggregates, water and chemical admixtures. Sand is the most commonly used as the fine aggregates in the conventional CLSM. It is getting more and more difficult to obtain sand in Korea so it is required that the alternative materials be developed as the replacement of sand. Since the engineering characteristics of coal ash are similar to the sand, it becomes necessary to examine the application of the coal ash as the alternative material for CLSM and as the environment-friendly material. When the results meet the optimum pH level that plants can live, it can be expanded the scale of application of the study on the plant as the important field. This study was subjected to present the method to reduce the pH range of CLSM to a suitable condition that plants can survive. To verify this method, the care of neutralization was conducted by immersing the specimen to Ammonium monohydrogen phosphate. Before curing and neutralization, the maximum pH of developmental CLSM is approximately 11. However, the pH value of developmental CLSM has under 9.5 after peaceful curing and neutralization management.
Keywords
Contolled Low Strength Material(CLSM); Coal Ash; Neutralization; Cure method; pH;
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Times Cited By KSCI : 3  (Citation Analysis)
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