Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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Mechanical and Electrical Properties of Self-sensing Grout Material with a High-Volume Ultrafine Fly Ash Replacement

초고분말 플라이 애시를 다량 치환한 자기감지형 그라우트재의 역학적 및 전기적 특성

  • Lee, Gun-Cheol (Department of Architectural Engineering, Korea National University of Transportation) ;
  • Kim, Young-Min (Department of Architectural Engineering, Korea National University of Transportation) ;
  • Im, Geon-Woo (Department of Architectural Engineering, Korea National University of Transportation)
  • Received : 2024.02.02
  • Accepted : 2024.03.28
  • Published : 2024.04.20
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Abstract

This study presents an experimental investigation into the performance of self-sensing grout formulated with a high volume of ultra-fine fly ash(UHFA). To explore the potential benefits of alternative cementitious materials, the research examined the effect of substituting UHFA with equal parts of blast furnace slag(BFS) fine powder. Both UHFA and BFS are byproducts generated in significant quantities by industrial processes. The evaluation focused on the fresh properties of the grout, including its flow characteristics, as well as the hardened properties such as compressive strength, dimensional stability(length change rate), and electrical properties. The experimental results demonstrated that incorporating UHFA resulted in a substantial reduction in the plastic viscosity of the grout, translating to improved flowability. Additionally, the compressive strength of the UHFA-modified grout surpassed that of the reference grout(without UHFA substitution) at all curing ages investigated. Interestingly, the electrical characteristics, as indicated by the relationships between FCR-stress and FCR-strain, exhibited similar trends for both grout mixtures.

본 연구에서는 초고분말 플라이 애시가 다량 치환된 자기감지형 그라우트의 성능을 검토하기 위하여 실험적 연구를 진행하였다. 또한 기존의 대표적인 산업부산물인 고로슬래그 미분말과 플라이 애시를 동일한 양으로 치환하여 굳지 않은 그라우트의 유동특성, 경화 그라우트에서 압축강도, 길이변화율, 전기적 특성을 평가하였다. 실험결과 초고분말 플라이 애시 치환시 소성점도가 크게 낮아져 유동성이 향상되었으며, 압축강도도 플레인보다 초기재령에서부터 높게 나타났다. 또한 전기적 특성에서도 FCR-Stress, FCR-Strain의 관계가 유사하게 나타났다.

Keywords

Acknowledgement

This research was supported by through the National Research Foundation of Korea(NRF), (No. 2023R1A2C2006400 and 2021R1A4A2001964).

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