Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Strength and CO2 Reduction of Fiber-Reinforced Cementitious Composites with Recycled Materials

자원순환형 재료를 사용한 섬유보강 시멘트 복합체(FRCCs)의 강도 및 CO2 저감에 관한 연구

  • Lee, Jong-Won (Dept. of Convergence System Engineering, Chungnam National University) ;
  • Kim, Sun-Woo (Dept. of Construction Engineering Education, Chungnam National University) ;
  • Park, Wan-Shin (Dept. of Construction Engineering Education, Chungnam National University) ;
  • Jang, Young-Il (Dept. of Construction Engineering Education, Chungnam National University) ;
  • Yun, Hyun-Do (Dept. of Architectural Engineering, Chungnam National University)
  • 이종원 (충남대학교 융복합시스템공학과) ;
  • 김선우 (충남대학교 건설공학교육학과) ;
  • 박완신 (충남대학교 건설공학교육학과) ;
  • 장영일 (충남대학교 건설공학교육학과) ;
  • 윤현도 (충남대학교 건축공학과)
  • Received : 2017.02.10
  • Accepted : 2017.06.22
  • Published : 2017.08.31
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Abstract

The objective of this study is to develop sustainable PVA fiber-reinforced cementitious composites (FRCCs) that could exhibit comparable strength level to normal PVA FRCCs with no recycled materials. To evaluate mechanical properties of the FRCCs, compressive, flexural and direct tensile tests were conducted. In addition to the test, to calculate amount of carbon dioxide ($CO_2$) emission at the stage of manufacturing the FRCCs, life cycle inventory data base (LCI DB) were referenced from domestic and Japan. From the test results, the mechanical properties such as compressive, flexural and direct tensile strengths were decreased as the replacement ratio of recycled materials increased. And it was determined that the amount of $CO_2$ emission was reduced for the specimens with higher water-binder ratio (W/B) and replacement ratios. It was also found that binder intensity ($B_i$) value was higher as replacement ratio of fly ash (FA) increased. This result means that larger amount of FA is need to deliver one unit of a given performance indicator (1 MPa of strength) of FRCCs compared to that of ordinary portland cement (OPC). As a result, it could be concluded that FRCCs with W/B 45% replaced by FA 25% and recycled sand (RS) 25% is desirable for both target performance and $CO_2$ emission.

본 연구에서는 기존 PVA 섬유보강 시멘트 복합체(fiber-reinforced cementitious composites, FRCCs) 대비 성능유지 90% 이상을 목표로 하여 자원순환형 재료를 치환한 PVA FRCCs를 제조 및 개발하고자 하였다. 자원순환형 재료를 치환한 FRCCs의 압축, 휨 및 직접인장강도 시험을 통하여 역학적 특성을 분석하였으며, 이와 더불어 FRCCs의 제조단계에서 이산화탄소($CO_2$) 배출량을 국내 외 LCI 데이터베이스를 통하여 평가하였다. 실험을 통해 역학적 특성을 평가한 결과, 자원순환형 재료의 치환율이 증가함에 따라 압축, 휨 및 직접인장강도가 감소하는 경향으로 나타났다. $CO_2$ 배출량은 물결합재비(W/B)가 높고, 플라이 애시(FA)의 치환율이 높을수록 감소하는 것으로 나타났다. FA의 치환율이 증가함에 따라 결합재 지수($B_i$) 또한 증가하여 단위 강도(1 MPa)를 발휘하기 위한 결합재의 양이 보통 포틀랜드 시멘트보다 FA가 높은 것으로 나타났다. FRCCs의 성능을 유지하기 위해 설정된 목표치와 $CO_2$ 배출량을 동시에 고려해 볼 때 W/B 45%, FA 25% 및 순환 잔골재 25%가 치환된 배합이 가장 우수한 것으로 나타났다.

Keywords

Acknowledgement

Supported by : 한국연구재단

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