한국건설순환자원학회논문집 (Journal of the Korean Recycled Construction Resources Institute)

한국건설순환자원학회 (Korean Recycled Construction Resources Institute)
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CO2 반응경화 시멘트 활용 모르타르의 양생조건에 따른 역학적 특성

Mechanical Properties According to Curing Conditions of Mortar Using CO2 Hardening Cement

  • 서지석 ((재)한국건설생활환경시험연구원 대전충남센터) ;
  • 태선규 ((재)한국건설생활환경시험연구원 대전충남센터) ;
  • 이준 ((재)한국건설생활환경시험연구원 대전충남센터) ;
  • 이봉춘 ((재)한국건설생활환경시험연구원 스마트건설재료센터)
  • Ji-Seok Seo (Daejeon & Chungnam Center, Korea Conformity Laboratories) ;
  • Sun-Gyu Tae (Daejeon & Chungnam Center, Korea Conformity Laboratories) ;
  • Jun Lee (Daejeon & Chungnam Center, Korea Conformity Laboratories) ;
  • Bong-Chun Lee (Daejeon & Chungnam Center, Korea Conformity Laboratories)
  • 투고 : 2023.09.22
  • 심사 : 2023.10.04
  • 발행 : 2023.12.30
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초록

이 연구에서는 CO2 반응경화 시멘트인 CSC와 일반 시멘트인 OPC의 혼합비율에 따라 모르타르 시험체를 제작하고 1차 양생온도 및 2차양생 CO2 압력을 제어하여 역학적 특성과 탄산화 특성에 대해 평가하였다. 모든 양생조건에서 CSC 비율이 높을수록 역학적 특성이 감소하는 것으로 나타났다. 1차 양생온도가 60 ℃인 경우가 20 ℃인 경우보다 더 높은 역학적 특성을 나타냈으며 탄산화 침투 깊이 또한 더 큰 것으로 나타났다. 2차 CO2 양생의 양생압력과 휨 강도는 반비례하였으나 압축강도는 비례하는 관계로 나타났다. 이는 과도한 탄산화가 오히려 역학적 특성을 감소하는 것에 기인한 것과 휨 강도가 압축강도에 비해 이러한 특성에 더 민감하기 때문인 것으로 판단된다. 다만, 제한 양생조건에 대한 평가결과로 향후 시험조건을 확장하여 면밀한 검토가 필요하다.

In this study, mortar test specimens were produced by varying the mixing ratio of CO2 reaction hardening cement (CSC) and general cement (OPC), and the mechanical and carbonation characteristics were evaluated by controlling the primary curing temperature and secondary curing CO2 pressure. Under all curing conditions, it was observed that the higher the CSC ratio in the binder, the lower the mechanical properties. Specifically, a first curing temperature of 60 ℃ yielded higher mechanical properties compared to the case of 20 ℃, and a greater carbonation penetration depth was also observed. At a first curing temperature of 60 ℃, it was noted that the curing pressure and bending strength during the second CO2 curing were inversely proportional, while the compressive strength showed a proportional relationship. This phenomenon is believed to be due to excessive carbonation, which reduces mechanical properties, and the fact that flexural strength is more sensitive to these properties compared to compressive strength. However, based on the evaluation of the limited curing conditions, it is evident that future test conditions need to be expanded and reviewed more thoroughly.

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과제정보

본 연구는 산업통상자원부 이산화탄소반응경화 시멘트제조기술사업의 지원에 의해 수행되었습니다. (과제번호 RS-2022-00155521)

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