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http://dx.doi.org/10.14190/JRCR.2022.10.3.252

Experimental Evaluation of Hydrate Formation and Mechanical Properties of Limestone Calcined Clay Cement (LC3) According to Calcination Temperature of Low-Quality Kaolin Clay in Korea  

Moon, Jae-Geun (Department of Architectural Engineering, Hanyang University)
Her, Sung-Wun (Department of Architectural Engineering, Hanyang University)
Cho, Seong-Min (Department of Architectural Engineering, Hanyang University)
Bae, Sung-Chul (Department of Architectural Engineering, Hanyang University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.10, no.3, 2022 , pp. 252-260 More about this Journal
Abstract
In Korea, low-quality kaolin has significantly greater reserves and superior economic efficiency than high-purity kaolin. However, the utilization is low because it does not match the demand conditions of the market, and it is difficult to find a suitable source of demand. The purpose of this study is to derive the possibility and optimal calcination temperature of domestic low-quality kaolin that can be used as a raw material for limestone plastic clay cement (LC3). Isothermal calorimetry, X-ray diffraction analysis, Thermogravimetric Analysis, and compressive strength tests were conducted to evaluate hydrate generation and mechanical properties of LC3 paste according to calcination temperatures (600 ℃, 700 ℃, 800 ℃, 900 ℃). As a result, although 50 % of the clinker was replaced, the domestic low-quality kaolin clay produced calboaluminate hydrate and C(A)SH from the 3rd day of hydration, showing almost equal or higher strength to OPC, and there was a big difference in strength depending on the firing temperature.
Keywords
$LC^3$; Low $CO_2$ cement; Limestone; Calcined clay; Low-quality kaolin clay;
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Times Cited By KSCI : 1  (Citation Analysis)
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