Journal of the Korean GEO-environmental Society (한국지반환경공학회 논문집)

Korean Geo-Environmental Society (한국지반환경공학회)
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Effect of Steel Fiber Addition on the Mechanical Properties and Durability of High-Flowable Retaining Wall Material

고유동 흙막이 벽체 재료의 역학적 성능 및 내구성에 대한 강섬유 혼입률의 영향

  • Donggyu Kim (Underground Space Safety Center, Korea Institute of Civil Engineering and Building Technology) ;
  • Seungtae Lee (Dept. of Civil Engineering, Kunsan National University)
  • Received : 2023.05.07
  • Accepted : 2023.05.30
  • Published : 2023.06.01
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Abstract

This paper is aimed to evaluate the mechanical properties and durability of high-flowable retaining wall material (RWM) with different levels of steel fiber (SF) content. To produce the specimens of RWM, some chemical agents such as superplasticizer (SP), air-entrained agent (AEA) and viscosity modifying agent (VMA) were added in the fresh RWM. The compressive and split tensile strength measurements were performed on the hardened RWM specimens at the predetermined periods. Additionally, surface electric resistivity and absorption tests according to ASTM standards were carried out to examine mechanical properties of RWM mixes. The durable performances such as chloride ions penetrability and freezing-thawing resistance of RWM mixes were experimentally investigated. As resutls, it was found that the performance of RWM mix with SF were much better than that without SF, especially at the 2% addition of SF. Thus, it is noted that the proper addition of SF in the RWM mix may have a beneficial effect to improve mechanical properties and durability of RWM mixes.

본 연구는 강섬유(SF) 혼입률에 따른 고유동 흙막이 벽체 재료(RWM)의 역학적 성능 및 내구성을 평가하기 위한 것으로써, 흙막이 벽체 재료의 재료분리저항성, 유동성, 연행공기량을 확보하기 위하여 적정량의 고성능감수제(SP), 공기연행제(AEA) 및 증점 안정화제(VMA)를 사용하였다. 흙막이 벽체 재료 경화체의 압축 및 쪼갬 인장강도를 소정의 재령에서 측정하였으며, 흙막이 벽체 재료의 역학적 성능은 표면전기저항성 및 흡수율 실험을 통하여 고찰하였다. 또, 염소이온 침투저항성 및 동결융해 저항성 실험을 통하여 흙막이 벽체 재료의 내구성능을 고찰하였다. 실험결과에 의하면, 강섬유를 적용한 배합이 강섬유 무혼입 배합에 비하여 우수한 성능을 나타내었으며, 2% 적용 배합이 경제성 및 성능 관점에서 상대적으로 효과적인 것으로 관찰되었다. 따라서, 적절한 SF의 적용은 흙막이 벽체 재료의 성능 향상에 기여할 것으로 판단된다.

Keywords

Acknowledgement

본 논문은 한국건설기술연구원 주요사업 "인공지능을 활용한 대심도 지하 대공간의 스마트 복합 솔루션 개발" 연구과제에서 연구비를 지원받아 수행된 결과입니다. 이에 감사드립니다.

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