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팽창재 및 수축저감제를 이용한 PSC 교량용 3성분계 그라우트의 수축특성 평가

Evaluating Shrinkage Characteristic of Ternary Grout for PSC Bridge Using Expansive Additive and Shrinkage Reducing Agent

  • 원천봉 (고려대학교 건축사회환경공학부) ;
  • 안기홍 (한국건설기술연구원 구조융합연구소) ;
  • 류금성 (한국건설기술연구원 구조융합연구소) ;
  • 고경택 (한국건설기술연구원 구조융합연구소) ;
  • 윤영수 (고려대학교 건축사회환경공학부)
  • Yuan, Tian-Feng (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • An, Gi-Hong (Structural Engineering Research Division, Korea Institute of Construction Technology) ;
  • Ryu, Gum-Sung (Structural Engineering Research Division, Korea Institute of Construction Technology) ;
  • Koh, Kyoung-Taek (Structural Engineering Research Division, Korea Institute of Construction Technology) ;
  • Yoon, Young-Soo (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 투고 : 2015.12.01
  • 심사 : 2016.07.21
  • 발행 : 2016.10.30

초록

본 논문에서는 혼화제에 따른 3성분계 그라우트에 대하여 자유수축 및 구속수축에 대하여 평가하였다. 본 연구에서 3성분계 그라우트는 플라이애쉬, 지르코늄 실리카퓸을 사용하였고, 팽창재(a, b)와 수축저감제 혼화제를 병용 사용하였다. 또한 유럽규정 EN 445에 따라 그라우트의 기본재료특성 실험을 수행하여 블리딩, 체적변화량, 유동성, 압축강도 실험을 수행하여 기본재료특성 거동도 분석하였다. 실험결과, 팽창재와 수축저감제 혼입률에 따라 유동성은 다소 영향은 없었으나, 우수한 블리딩 및 침하 저감성능과 압축강도를 나타났다. 자유수축 거동에서는 팽창재와 수축저감제를 혼입한 변수들은 0.0E-0.0R 변수보다 최소 29%의 수축저감성능을 보여 주었다. 특히 팽창재 a와 수축저감제를 병용 사용한 변수에서는 수축 저감의 효과가 더욱 우수한 것으로 나타났으며, 혼화제의 혼입률이 증가할수록 텐던 구속에 의한 수축균열은 뒤늦게 발생함을 알 수 있었다. 그러나 유독 팽창재 a 2.0%, 수축저감제 0.50%를 혼입한 변수에서는 우수한 수축저감성능으로 수축균열이 발생하지 않았다. 종합하여 볼 때, 본 연구의 실험 조건에서는 팽창재 a 2.0%, 수축저감제 0.50%인 조합이 PSC 교량용 고품질 3성분계 그라우트의 최적의 혼입률인 것으로 분석된다.

This paper reports on analyzing the free and restrained shrinkage characteristic of ternary grout used cementitious admixture. In this study, the cementitious admixture was used such as fly ash, ziricania silica fume by combination of expansive additive (a, b) and shrinkage reducing agent. And a number of basic performance tests were conducted to investigate bleeding, volume change, fluidity and compressive strength behavior. According to the results, within appropriate mixing ratio, even the fluidity is not influenced by expansive additive and shrinkage reducing agent, the resistant properties of bleeding, volume change, shrinkage and compressive strength are increased. Comparing with plain grout, the free shrinkage reduced by a minimum of 29% which specimens are added expansive additive and shrinkage reducing agent. The combination of expansive additive a and shrinkage reducing agent is the most effective for reduction of shrinkage. And increasing the mixing ratio of expansive additive and shrinkage reducing agent extended cracking time. Nevertheless, combined addition of expansive additive a 2.0% and shrinkage reducing agent 0.50% has best shrinkage reduction behavior and not appeared cracking. From the above, the mixing ratio of 2.0% of expansive additive a and 0.50% of shrinkage reducing agent is high performance ternary grout for PSC bridge.

키워드

참고문헌

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피인용 문헌

  1. Evaluating Material Properties of Grout for PSC Bridge According to Admixture Type vol.18, pp.2, 2018, https://doi.org/10.9798/KOSHAM.2018.18.2.299