Journal of the Architectural Institute of Korea (대한건축학회논문집)

Architectural Institute of Korea (대한건축학회)
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Impact of Binder Combinations on Concrete Compressive Strength and Durability of Concrete Utilizing Coal Gasification Slag Aggregate

결합재 조합이 석탄 가스화 용융 슬래그 잔골재사용 콘크리트의 압축강도 및 내구성에 미치는 영향

  • Park, Sang-Won (Dept. of Architectural Engineering, Cheong-ju University) ;
  • Han, Jun-Hui (Dept. of Architectural Engineering, Cheong-ju University) ;
  • Han, Min-Cheol (Dept. of Architectural Engineering, Cheong-ju University)
  • Received : 2023.12.12
  • Accepted : 2024.02.19
  • Published : 2024.03.30
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Abstract

This study examines the potential use of coal gasification slag (CGS) as a fine aggregate in concrete mixtures, considering different combinations of cement types and mix designs. Test results revealed that concrete flowability increases with changes in cement composition and CGS replacement ratio, while reducing air content necessitates higher doses of air-entraining agent. The initial compressive strength of concrete is notably high with cement, with greater long-term strength observed in combinations involving binary or ternary blended mineral admixtures. However, a slight decrease of 1-5% in compressive strength is noted with an increased CGS replacement ratio. Durability fluctuations, mostly minor, vary with cement type, generally showing positive results associated with the CGS replacement ratio. Nonetheless, reduced frost resistance is observed only in the TBC+CGS 50% mixture, suggesting air content's predominant influence over CGS's impact on frost resistance. Overall, CGS use as a fine aggregate of up to 50% poses no adverse effects on concrete's comprehensive physical properties and durability. However, additional research is necessary to devise methods for maintaining optimal air content in CGS materials.

Keywords

Acknowledgement

이 연구는 한국연구재단의 정부지원(과학기술정보통신부)으로 진행되었습니다. 과제번호 : NRF-2020R1A2C1015162

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