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고로슬래그미분말을 사용한 콘크리트의 염화물이온에 의한 철근부식 저항성 연구

A Study on Corrosion Resistance of the Reinforement in Concrete Using Blast-Furnace Slag Powder

  • 김은겸 (서울산업대학교 토목공학과) ;
  • 김진근 (KAIST 토목공학과) ;
  • 이동혁 (서울산업대학교 토목공학과) ;
  • 김영웅 (인천국제공항공사 건설시험소) ;
  • 김용철 (인천국제공항공사 건설시험소)
  • Kim Eun-Kyun (Dept. of Civil Engineering, Seoul National University of Technology) ;
  • Kim Jin-Keun (Dept. of Civil Engineering, Korea Advanced Institute of Science and Technology) ;
  • Lee Dong-Hyuk (Dept. of Civil Engineering, Seoul National University of Technology) ;
  • Kim Young-Ung (Research & Analysis Office, Inchon International Airport Corp.) ;
  • Kim Yong-Chul (Research & Analysis Office, Inchon International Airport Corp.)
  • 발행 : 2004.02.01

초록

본 논문은 고로슬래그미분말을 혼화한 콘크리트의 염화물 침투 및 철관 발청 성능을 평가한 것이다. 실험에는 1종 보통포틀랜드시멘트와 5종 내황산염시멘트 사용하였으며, 고로슬래그는 이들 시멘트 대신에 각각 $25\%$, $40\%$$55\%$를 치환하였다. 촉진 염화물 침투 시험결과에 대한 평가는 ASTM C 1202에 규정에 따랐으며, 철근 발청은 건습반복에 의한 촉진 시험에 의해 수행되었다. 시험체는 콘크리트로 제작하였으며, 각각 수중양생 28일, 56일 및 91일간 실시하였다. 모든 콘크리트 시험체는 3일간 염수 침지한 후 4일간 건조로에서 건조시키는 것을 1 cycle로 정하여 30 cycle에서 시험을 종료하는 것으로 하였다. 염수 침지 조건은 수온 $40^{\circ}C$, NaCl $3^{\circ}C$로 하였으며, 시험체의 건조는 건조로를 사용하여 $60^{\circ}C$에서 건조시키는 것으로 하였다. 시험결과, 고로슬래그미분말을 혼화한 1종 시멘트를 사용한 콘크리트 시험체의 염소이온 확산계수는 무치환의 경우에 비해 상당히 감소하였으며, 5종 시멘트를 사용한 경우에 있어서는 1종 시멘트를 사용한 시험체에 비해 염소이온의 확산계수는 증가하는 것으로 나타났다. 촉진시험에 의한 철근 발청은 고로슬래그미분말의 사용에 의해 상당한 저항성을 갖고 있으며, 5종 시멘트를 사용한 경우에는 철근 발청이 증가하는 현상을 나타내었다.

This paper represents the permeability of chloride ions and the corrosion performance in the concrete blended with granulate blast furnace slag exposed to chloride environment. An ordinary cement (type I ) and sulfate resisting cement(type V) were used for the experiment. The two cements were combined with $0\%$, $25 \%$, $40\%$, and $55\%$ of the granulated blast furnace slag. The accelerated permeability tests of chloride ions were performed in accordance with ASTM C1202, and the accelerated corrosion tests of steel were carried out by using the method of immersion/drying cycles. After water curing 28 days, 56 days and 91 days, these tests were conducted until 30 cycles. In every cycle, test specimens were wetted in $3\%$ NaCl solution for three days and dried again in $60^{\circ}C$ air for four days. As an experimental results, the diffusion coefficient of chloride ions of the ordinary cement Concrete Combined granulated blast furnace slag was much lower than that of non granulated blast furnace slag concrete. Moreover, the diffusion coefficient of chloride ions of sulfate resisting cement concrete was higher than that of ordinary cement concrete. On the basis of the results of accelerated corrosion tests, corrosion resistance of the concrete mixed with granulated blast furnace slag shows good to corrosion resistance, however, the concrete with sulfate resisting cement shows bad to corrosion resistance.

키워드

참고문헌

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피인용 문헌

  1. Performance Based Evaluation of Concrete Chloride Diffusion Resistance from Wind Speed-Sunlight Exposure Time Curing Conditions of Climate Change vol.28, pp.5, 2016, https://doi.org/10.4334/JKCI.2016.28.5.601
  2. Structural Capacity of Water Channel Fabricated of Blast Furnace Slag Concrete vol.4, pp.4, 2016, https://doi.org/10.14190/JRCR.2016.4.4.446