Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Validation of Test Methods for Chloride Penetration Durability of Alkali Activated Slag

알칼리 활성 슬래그의 염해 내구성 평가 시험 방법 유효성

  • Lim, Min-Hyuk (Department of Civil Engineering, Chungnam National University) ;
  • Lee, Do-Keun (Department of Civil Engineering, Chungnam National University) ;
  • Shin, Kyung-Joon (Department of Civil Engineering, Chungnam National University) ;
  • Song, Keum-Il (Department of Architectural Engineering, Chonnam National University) ;
  • Song, Jin-Kyu (Department of Architectural Engineering, Chonnam National University)
  • Received : 2018.11.06
  • Accepted : 2019.02.21
  • Published : 2019.03.30
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Abstract

Recently, studies on alkali activated slag(AAS) binders that do not use cement have been actively conducted. It is known that AAS concrete is highly resistant to chloride damage based on the test method used for ordinary concrete. However, it is fully not understood whether the test method used for concrete can be applied to AAS mixtures. Therefore, in this study, we verified the consistency of NT Build 492 and ASTM C 1202 test methods by applying various experimental variables. According to the experimental results, the two tests yielded opposite results. Therefore, the chloride durability of AAS mortar can be different depending on the evaluation method.

최근 시멘트를 사용하지 않는 알칼리 활성 슬래그(AAS) 결합재에 대한 연구가 활발히 이루어지고 있다. AAS 콘크리트는 염해 저항성은 주로 기존의 콘크리트에 대한 실험법을 차용하여 평가하고 있으며, 염해에 대한 저항성이 매우 높은 것으로 알려져 있다. 그러나 콘크리트에 적용하던 시험 방법을 AAS 배합에 유효하게 적용하고 있는지에 대한 검증은 정확하게 알려져 있지 않다. 따라서 본 연구에서는 다양한 실험 변수를 적용하여 NT Build 492와 ASTM C 1202 시험 방법에 대한 일관성을 검증하였다. 실험결과에 따르면 두 시험 방법은 상반된 결과를 도출하고 있었다. 따라서 AAS 모르타르의 염해 내구성은 평가 방법에 따라 다른 경향을 나타낼 수도 있을 것이다.

Keywords

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Fig. 1. Pre-treatment of specimens

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Fig. 2. Set-up for NT build 492 test

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Fig. 3. Arrangement of migration test set-up

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Fig. 4. Test set-up for rapid chloride penetration test

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Fig. 5. Chloride diffusion coefficient

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Fig. 6. Relative ratio of chloride diffusion coefficient with respect toaverage value

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Fig. 7. RCPT test result

Table 1. Chemical composition of the source material(% by mass)

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Table 2. Mixture proportions of tested mortar

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Table 3. Test conditions for chloride migration test

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Table 4. Test conditions for chloride migration test

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Table 5. Measured chloride diffusion coefficients

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Table 6. Test conditions for chloride migration test

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