Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Durability Properties of Ultra Rapid Hardening Mortar Produced with Alumina-based Binder for Repairing Sewage Treatment Pipes

하수관거 보수용 알루미나계 결합재 초속경 모르타르의 내구 특성

  • Eun-Ho, Kim (Department of Civil Engineering, Chungnam National University) ;
  • Byung-Jae, Lee (Department of Civil Engineering, Daejeon University) ;
  • Sun-Mok, Lee (Technolgy Sales & Maketing, JW Materials Co., Ltd.) ;
  • Yun-Yong, Kim (Department of Civil Engineering, Chungnam National University)
  • 김은호 (충남대학교 토목공학과) ;
  • 이병재 (대전대학교 토목공학과) ;
  • 이선목 ((주)정우소재 기술영업부) ;
  • 김윤용 (충남대학교 토목공학과)
  • Received : 2022.11.13
  • Accepted : 2022.12.14
  • Published : 2022.12.30
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Abstract

In this study, the durability of ultra rapid hardening mortar for sewage pipe was evaluated by type of mortar binder. As a result of analyzing the internal structure for each type of mortar, it was confirmed that Al2(OH)3 was generated in the internal structure of the CAC-based mortar, and its corrosion resistance was superior to that of other types of mortar. As a result of the compressive strength test, OPC had the tsmallest strength, followed by CAC100 > CAC100P > CAC80. This trend was similar to the previous study results. Chloride ion penetration resistance and freeze-thaw test showed similar trends. That is, CAC and C12A7 were better than OPC, and CSA was worse than OPC. This is mostly beacuse of cracks caused by expansion of CSA-based mortar. CAC100P mix showed the best chemical resistance. It is thought that this is because the alumina gel formed inside the mortar and the polymer combine to make the internal structure more dense.

이 연구에서는 하수관거에 대한 수중불분리성 보수재료 개발을 위해 결합재 조성에 따른 내구성능을 평가하였다. 배합조건에 따른 모르타르의 내부 구조 분석 결과, CAC 배합의 경우 내식성 문제가 야기될 수 있는 Ca(OH)2를 형성하지 않고 알루미나겔(Al2(OH)3)를 형성 함으로서 내식성이 우수한 것으로 확인되었다. 압축강도 시험결과, OPC가 가장 낮은 강도를 나타내었으며, CAC100 > CAC100P > C12A7 > CSA > CAC80순으로 나타나 기존연구결과와 유사한 경향을 나타내었다. 염소이온침투저항성 및 동결융해시험 결과 동일한 내구성능을 나타내었으며 알루미나시멘트(CAC 및 C12A7의) 계열은 OPC보다 우수한 경향을 나타내었지만 CSA는 내부 팽창균열로 인해 내구성능이 낮은 것으로 판단된다. 화학저항성 시험결과, CAC100P 배합이 가장 우수한 화학저항성을 나타내었다. 이는 보수재 내부에 형성된 알루미나겔과 폴리머 분자가 결합하여 매트릭스가 치밀해졌기 때문으로 판단된다.

Keywords

Acknowledgement

이 논문은 2020년도 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업임(NRF-2020R1A2C1101465).

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