Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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Mechanical Properties of Fiber-reinforced Cement Composites according to a Multi-walled Carbon Nanotube Dispersion Method

다중벽 탄소나노튜브의 분산방법에 따른 섬유보강 시멘트복합체의 역학적 특성

  • Kim, Moon-Kyu (Department of Architectural Engineering, Chungnam National University) ;
  • Kim, Gyu-Yong (Department of Architectural Engineering, Chungnam National University) ;
  • Pyeon, Su-Jeong (Department of Architectural Engineering, Chungnam National University) ;
  • Choi, Byung-Cheol (Department of Architectural Engineering, Chungnam National University) ;
  • Lee, Yae-Chan (Department of Architectural Engineering, Chungnam National University) ;
  • Nam, Jeong-Soo (Department of Architectural Engineering, Chungnam National University)
  • Received : 2024.01.11
  • Accepted : 2024.01.31
  • Published : 2024.04.20
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Abstract

This study delves into the mechanical properties of fiber-reinforced cement composites(FRCC) concerning the dispersion method of multi-walled carbon nanotubes(MWCNTs). MWCNTs find utility in industrial applications, particularly in magnetic sensing and crack detection, owing to their diverse properties including heat resistance and chemical stability. However, current research endeavors are increasingly directed towards leveraging the electrical properties of MWCNTs for self-sensing and smart sensor development. Notably, achieving uniform dispersion of MWCNTs poses a challenge due to variations in researchers' skills and equipment, with excessive dispersion potentially leading to deterioration in mechanical performance. To address these challenges, this study employs ultrasonic dispersion for a defined duration along with PCE surfactant, known for its efficacy in dispersion. Test specimens of FRCC are prepared and subjected to strength, drawing, and direct tensile tests to evaluate their mechanical properties. Additionally, the influence of MWCNT dispersion efficiency on the enhancement of FRCC mechanical performance is scrutinized across different dispersion methods.

본 연구에서는 내열성, 화학적 안정성 등 다양한 특성으로 인해 산업 분야에서 자기감지, 균열 감지 등의 용도로 활용되고 있는 MWCNT를 활용하여 진행하였다. 하지만 MWCNT는 전기적 특성을 활용한 자기감지 및 스마트 센서에 대한 연구에 집중되어 있다. 또한, 연구자의 기술 및 장비의 차이로 인해 정량적 분산이 어렵고, 과도한 분산은 기계적 성능 저하로 이어질 수 있다. 따라서 본 연구에서는 일정 시간 초음파 분산과 분산 효과가 입증된 PCE 계면활성제를 활용하여 섬유보강 시멘트복합체 시험편을 제조하고, 각 시험편에 대해 강도 시험, 인발 시험, 직접 인장 시험을 수행하여 기계적 물성을 평가하였다. Micro-CT 촬영과 압축, 휨, 인장 강도 시험 결과 초음파 분산과 분산제를 사용한 시험체인 U-A0.5와 분산제만을 사용한 N-A0.5가 다른 시험체에 비해 높은 강도를 보이는 것을 확인하였으며 분산 방법에 따라 MWCNT의 분산 효율이 섬유보강 시멘트복합체의 기계적 성능 향상에 미치는 영향을 조사하였다.

Keywords

Acknowledgement

This study was supported by the National Research Foundation of Korea, funded by the Ministry of Science and ICT of Korea in 2020(No. 2020R1C1C101403812).

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