Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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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

국산 저품질 고령토의 소성온도에 따른 석회석 소성점토 시멘트(LC3)의 수화물 생성 및 기계적 특성 평가

  • 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)
  • 문제근 (한양대학교 건축공학과) ;
  • 허성원 (한양대학교 건축공학과) ;
  • 조성민 (한양대학교 건축공학과) ;
  • 배성철 (한양대학교 건축공학과)
  • Received : 2022.08.31
  • Accepted : 2022.09.19
  • Published : 2022.09.30
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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.

국내에서 카올린 순도가 낮은 저품질의 고령토는 고순도의 고령토보다 월등히 많은 매장량과 우수한 경제성에도 불구하고 제품으로 활용되지 못하고 대부분 사장되고 있다. 본 연구의 목적은 국산 저품질 고령토를 석회석 소성점토 시멘트(LC3)의 원료로 활용할 수 있는 가능성과 최적의 소성온도를 도출하는 것으로, 고령토의 소성온도(600 ℃, 700 ℃, 800 ℃, 900 ℃)에 따른 LC3 페이스트의 수화물 생성과 기계적 특성을 평가하기 위해 등온 열량 측정, X-선 회절 분석, 열 중량 분석 및 압축강도 시험을 실시하였다. 결과적으로 국산 저품질 고령토 점토는 클링커의 50 %를 대체하였음에도 불구하고 수화 3일차부터 메타카올린의 포졸란 반응에 의해 카르보알루미네이트 수화물과 C(A)SH를 생성하여 OPC와 거의 동등하거나 그 이상의 강도를 나타냈으며, 소성온도에 따라 강도발현에 큰 차이가 발생하는 것으로 나타났다.

Keywords

Acknowledgement

본 연구는 한국연구재단의 연구비지원(NRF-2020R1A4A1019074)에 의해 수행되었습니다.

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