Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Effects of Nanoparticles on the Fracture Toughness of Cement Mortar

나노 입자가 시멘트 모르타르의 파괴인성치에 미치는 영향

  • Seung Won Choi (Department of Civil and Environmental Engineering, Sejong University) ;
  • Cho Won Baek (Department of Civil and Environmental Engineering, Sejong University) ;
  • Seon Yeol Lee (Department of Civil and Environmental Engineering, Sejong University) ;
  • Van Thong Nguyen (Department of Civil and Environmental Engineering, Sejong University) ;
  • Dong Joo Kim (Department of Civil and Environmental Engineering, Sejong University)
  • 최승원 (세종대학교 건설환경공학과) ;
  • 백초원 (세종대학교 건설환경공학과) ;
  • 이선열 (세종대학교 건설환경공학과) ;
  • 뉘엔 반 통 (세종대학교 건설환경공학과) ;
  • 김동주 (세종대학교 건설환경공학과)
  • Received : 2023.10.06
  • Accepted : 2023.12.18
  • Published : 2023.12.30
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Abstract

This study investigated the effects of nanoparticles on the fracture toughness of cement mortar. Three-point bending tests, compressive tests, and slump tests were conducted on cement mortars reinforced with carbon nanotubes(CNTs), nanosilica(NS), and nano calcium carbonate(NC), respectively. Cement mortar with a water-to-cement ratio and a sand-to-cement ratio of 0.45 and 1.5, respectively, and reinforced with 0 and 2 vol.% of 19.5 mm steel fibers, respectively, was used. Reinforcement with nanoparticles partially improved the fracture toughness and compressive strength of the cement mortar. However, in the case of cement mortar reinforced with steel fibers, the reinforcement with nanoparticles was found to reduce the flowability of the mortar, adversely affecting the dispersion of steel fibers, and ultimately leading to a decrease in fracture toughness, contrary to the intended enhancement. Additional research is needed to improve the decrease in mortar fluidity caused by the reinforcement with nanoparticles.

이 연구는 나노 입자의 혼입이 시멘트 모르타르의 파괴인성치에 미치는 영향을 조사하였다. 탄소나노튜브 (carbon nanotube, CNT), 나노실리카 (nanosilica. NS), 그리고 나노 탄산칼슘 (nano calcium carbonate, NC)가 각각 혼입된 시멘트 모르타르의 3점 재하 휨강도, 압축강도, 슬럼프 실험을 수행하였다. 물시멘트비, 잔골재시멘트비가 각각 0.45, 1.5인 모르타르에 19.5 mm 강섬유가 0, 2 vol.% 혼입된 시멘트 모르타르를 사용하였다. 나노 입자 혼입은 시멘트 모르타르의 파괴인성치와 압축강도를 일부 향상시켰다. 그러나 강섬유가 보강된 시멘트 모르타르의 경우 나노 입자 혼입은 모르타르 유동성을 저하하여 강섬유의 분산도에 부정적 영향을 초래하여 오히려 파괴인성치를 감소시키는 결과를 확인할 수 있었다. 나노 입자의 혼입으로 인한 모르타르의 유동성 저하를 개선할 수 있는 추가적인 연구가 필요하다.

Keywords

Acknowledgement

본 연구는 국토교통부/국토교통과학기술진흥원의 지원으로 수행되었습니다(과제번호 23NANO-C156177-04).

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