Cement Science and Concrete Technology
Online ISSN : 2187-3313
Print ISSN : 0916-3182
ISSN-L : 0916-3182
Durability
THERMODYNAMIC MODELING OF STABILIZATION AND LEACHING PROCESSES OF HEXAVALENT CHROMIUM IN CEMENTED SOILS
Yuya TAKAHASHITetsuya ISHIDA
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2014 Volume 67 Issue 1 Pages 472-479

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Abstract

The purpose of this research is to simulate and predict the stabilization and leaching process of hexavalent chromium from cement-solidified soil. An existing analytical system named DuCOM, which principally deals with cementitious materials, is expanded to apply to soil materials in this study. Firstly, mass conservation equation of chromium is formulated and added to the existing system. The binding model is identified with the past research, considering the ion adsorption on the surface of Ca(OH)2 and C-S-H hydrates and the solid solution formation in the AFm hydrates. After verification of the models with the experiment using cement paste specimens which contains K2CrO4 solutions, tank leaching tests and medium-size soil tank test in the previous research are simulated with the proposed analytical model. Leached amounts of chromium from cement-solidified soil are calculated and the results show that the system can simulate the tank leaching test under various conditions reasonably.

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