Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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A Study on the Residual Compressive Strength of Concrete Mixed with Limestone Powder after Heating

석회석 미분말이 혼입된 콘크리트의 가열 후 잔류 압축강도에 관한 연구

  • Choi, Youn-Sung (Dept of Architectural Engineering, Chungnam University) ;
  • Kim, Gyu-Yong (Department of Smart City Architectural Engineering, Chung Nam University) ;
  • Suh, Dong-Kyun (Carbon Neutral Research Center R&D Center, Asiacement Co.) ;
  • Eu, Ha-Min (Dept of Architectural Engineering, Chungnam University) ;
  • Han, Seung-Hyeon (Dept of Architectural Engineering, Chungnam University) ;
  • Nam, Jeong-Soo (Department of Smart City Architectural Engineering, Chung Nam University)
  • Received : 2024.09.06
  • Accepted : 2024.09.30
  • Published : 2024.10.20
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Abstract

In this research, the thermal properties of limestone fine powder at high temperatures were examined, followed by an analysis of its residual compressive strength when incorporated into concrete under various thermal conditions, to determine its impact on concrete subjected to high heat. The study revealed that at 900℃, limestone micropowder undergoes a decarbonization reaction, where calcium carbonate(CaCO3) decomposes into calcium oxide(CaO), accompanied by an expansion of the limestone powder as temperature increases. This expansion leads to material cracking or crushing starting at temperatures above 500℃. Further analysis on concrete mixed with limestone powder showed that heating up to 300℃ could promote the reaction of hydrates within the concrete, thereby enhancing its strength. However, exposure to temperatures beyond 500℃ causes the limestone powder within the concrete to crack or fracture, significantly reducing the concrete's strength properties. This study highlights the dual role of limestone fine powder in influencing concrete's behavior under high-temperature scenarios, demonstrating an initial strengthening effect followed by a detrimental impact at higher temperatures.

본 연구에서는 석회석 미분말의 고온 열적 특성을 분석한 이후, 석회석 미분말을 다양한 조건에서 콘크리트에 혼입하였을 때 가열 후 잔류 압축강도에 대해 분석하였다. 이를 통해 석회석 미분말이 고온에서 콘크리트에 미치는 영향을 검토하였다. 석회석 미분말의 고온 열적 특성 결과, 석회석 분말은 900℃에서 탈 탄산화 반응이 일어나면서 열에 의해 CaCO3가 CaO로 분해되는 것을 관찰했으며, 온도가 높아질수록 석회석 분말이 점차 팽창하여 500℃ 이상의 온도부터 균열 또는 파쇄가 발생하는 것을 확인하였다. 석회석 미분말 혼입 콘크리트의 가열 후 잔류 기계적 물성을 분석한 결과, 300℃ 이하에서 시험체를 가열하면 콘크리트 내 수화물의 반응이 촉진되어 강도가 증가하였지만, 500℃ 이상의 온도로 가열한 경우 석회석 분말에 균열이나 파괴가 발생하여 콘크리트의 강도 특성이 저하시키는 것을 확인하였다.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIT)(No. RS-2023-00220921).

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