Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Non-destructive Analysis of Nano-Cementitious Composites Using Ultrasonic and Electrical Resistance

초음파 및 전기저항을 활용한 나노-시멘트 복합체의 비파괴 분석

  • Shin, Yangsub (Department of Civil Engineering, KyungHee University) ;
  • Lee, Heeyoung (Department of Civil Engineering, Chosun University) ;
  • Cho, Sanghyeon (Department of Civil Engineering, KyungHee University) ;
  • Park, Sohyeon (Department of Civil Engineering, KyungHee University) ;
  • Chung, Wonseok (Department of Civil Engineering, KyungHee University)
  • 신양섭 (경희대학교 사회기반시스템공학과) ;
  • 이희영 (조선대학교 토목공학과) ;
  • 조상현 (경희대학교 사회기반시스템공학과) ;
  • 박소현 (경희대학교 사회기반시스템공학과) ;
  • 정원석 (경희대학교 사회기반시스템공학과)
  • Received : 2021.08.27
  • Accepted : 2021.09.24
  • Published : 2021.09.30
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Abstract

Nano-cementitious composites may have defects due to poor dispersion of nanomaterials and fabrication process. These defects can cause critical problems for nano-cementitious composites, but studies related to non-destructive analysis of defects sizes inside nano-cementitious composites are insufficient. This study aims to perform non-destructive analysis of nano-cementitious composites by utilizing ultrasonic and electrical resistance. Various sizes of defects were implemented inside the specimens and the specimens were subjected to ultrasonic non-destructive analysis and electrical resistance non-destructive analysis depending on the size of defects and curing days. As a result of the experiment, ultrasonic pulse velocity decreased by up to 11% as the defects size increased, and the electrical resistance increased by up to 14% depending on the defects size. For this reason, this study concluded that non-destructive analysis using ultrasonic and electrical resistance can predict defects inside nano-cementitious composites.

나노-시멘트 복합체는 나노재료 분산 불량 및 제작과정 불량으로 인하여 내부에 결함이 발생할 수 있다. 이러한 내부 결함은 나노-시멘트 복합체에 치명적인 문제를 야기할 수 있으나 국내외에서의 나노-시멘트 복합체 내부의 결함 크기에 따른 비파괴 분석 관련 연구는 미비한 실정이다. 본 연구는 초음파와 전기저항을 활용하여 나노-시멘트 복합체의 비파괴 분석을 수행하고자 한다. 시편 내부의 결함은 다양한 크기로 구현되었으며, 시편은 양생일 및 결함 크기에 따라 초음파 비파괴 분석과 전기저항 비파괴 분석이 수행되었다. 실험 결과, 초음파 전파 속도는 결함 크기가 증가할수록 최대 11% 감소하였으며, 전기저항은 결함 크기에 따라 최대 14%까지 증가하였다. 이러한 이유로 초음파와 전기저항을 이용한 비파괴 분석을 활용하여 나노-시멘트 복합체 내부의 결함을 예측할 수 있는 것으로 판단된다.

Keywords

Acknowledgement

본 연구는 국토교통부/국토교통과학기술진흥원(No.21NANO-B156177-02)의 지원에 의해 수행되었습니다.

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