Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Mechanical Properties and Resistance to Freezing and Thawing of Concrete Using Air-Cooled Ferronickel Slag Fine Aggregate

서냉 페로니켈 슬래그 잔골재를 이용한 콘크리트의 역학적 특성 및 동결 융해 저항성

  • Lee, Hong-Gik (Duksan Development Co., Ltd) ;
  • Bae, Su-Ho (Department of Civil Engineering, Andong National University) ;
  • Lee, Hyun-Jin (Department of Civil Engineering, Andong National University) ;
  • Choi, Yun-Wang (Department of Civil Engineering, Semyung University) ;
  • Cho, Bong-Suk (Energy Research Group, Research Institute of Industrial Science and Technology)
  • Received : 2018.11.02
  • Accepted : 2018.12.06
  • Published : 2018.12.30
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Abstract

Ferronickel slag is a by-product from the ferronickel smelting process and it is divided into air-cooled ferronickel slag and water granulated ferronickel slag according to cooling system. The purpose of this experimental resesrch is to investigate the mechanical properties and resistance to freezing and thawing of concrete using air-cooled ferronickel slag(ACFNS) fine aggregate. For this purpose, the concrete specimens with water-cement ratio of 50% were made with ACFNS's replacement ratios of 0%, 20%, 30%, 40%, 50%, 70%, and 100% by volume of fine aggregate. It was observed from the test results that the compressive strength and static modulus of elasticity of ACFNS fine aggregate concrete were increased with increasing replacement ratio of ACFNS and the resistance to freezing and thawing of this was similar to reference concrete which had the relative dynamic modulus of elasticity of more than 90% during the freezing and thawing of 300 cycles.

페로니켈 슬래그는 페로니켈의 제련과정에서 발생하는 산업부산물로, 냉각 방법에 따라 서냉 페로니켈 슬래그와 수쇄 페로니켈 슬래그로 구분된다. 본 연구의 목적은 서냉 페로니켈 슬래그(air-cooled ferronickel slag, ACFNS) 잔골재를 이용한 콘크리트의 역학적 특성 및 동결융해 저항성을 평가하는 것이다. 이를 위하여 물-시멘트비 50%에 대해서 ACFNS 혼입률을 잔골재용적비로 7가지 수준(0%, 20%, 30%, 40%, 50%, 70%, 100%)으로 변화시켜 ACFNS 잔골재를 이용한 콘크리트를 제작하였다. 실험결과로부터, ACFNS 잔골재 콘크리트의 압축강도 및 정탄성계수는 ACFNS의 혼입률이 증가할수록 커지고, 동결융해 저항성은 동결융해 300 사이클 동안 상대동탄성계수가 90% 이상으로 나타난 기준 콘크리트와 유사한 것으로 나타났다.

Keywords

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Fig. 1. Air-cooled ferronickel slag

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Fig. 2. Measurement of longitudinal displacement

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Fig. 3. Freezing and thawing test

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Fig. 4. Dosage of superplasticizer with replacement ratio of ACFNS

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Fig. 5. Compressive strength with replacement ratio of ACFNS

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Fig. 6. Static modulus of elasticity with replacement ratio of ACFNS

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Fig. 7. Resistance to freezing and thawing of ACFNS fine aggregateconcrete

Table 1. Physical properties of cement

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Table 2. Physical properties of aggregates

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Table 3. Chemical composition of ACFNS

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Table 4. Mix proportions of ACFNS fine aggregate concrete

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References

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