MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Effect of CO2 Carbonation on the Chemical Properties of Waste Cement: CEC and the Heavy Metal Adsorption Ability
Kwang-Suk YouSeong-Ho LeeSun-Ho HwangJi-Whan Ahn
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2011 Volume 52 Issue 8 Pages 1679-1684

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Abstract

This study investigated changes in the chemical properties of carbonated waste cement, including the phase transformation, gel polymerization, and specific surface area, as well as cation exchange capacity (CEC) and the adsorption ability of heavy metal ions (Cr6+ and Cu2+). Highly crystalline calcite and highly polymerized silica gel with a three-dimensional network were found to form in carbonated waste cement. The specific surface area and the CEC of waste cement increased with an increase in the carbonation percentage. In addition was a linear relationship between the specific surface area and the carbonation percentage of the waste cement. When the carbonation percentage of waste cement was 35%, the CEC of the carbonated waste cement reached approximately 22 meq/100 g (The unit of [meq/100 g] is milliequivalent per 100 gram. The unit indicates the concentrations of electrolytes.). The increase of the CEC confirmed that carbonated waste cement could adsorb heavy metals.

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© 2011 The Japan Institute of Metals and Materials
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