Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Physiochemical Characteristics and its Applicable Potential of Blast Furnace Slag Grout Mixtures of Sodium Silicate and Calcium Hydroxide

규산소다 및 수산화칼슘을 적용한 고로슬래그 그라우트의 적용성 및 물리화학적 특성

  • Received : 2018.09.27
  • Accepted : 2019.01.04
  • Published : 2019.01.31
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Abstract

Cement is one of the most commonly used materials in the construction and civil engineering industry. However, emissions of carbon dioxide generated during the production of cement have been linked to climate change and environment pollutants. In order to replace cement, many studies have been actively performed research to utilizing Blast Furnace Slag(BFS), which is a byproduct of the steel industry. This study aims to investigate the physiochemical properties of the BFS powder based grout to determine whether it can be used as an environment-friendly grout material. As a fine powder, BSF can be used instead of cement grout due to its potential hydraulic property. BSF has also been known for its ability to strengthen materials long-term and to densify the internal structure of concrete. In order to investigate the physicochemical properties of the BFS powder based grout as a grout material, in this study assessment tests were performed through a gel-time measurement, uniaxial compressive strength, and chemical resistance tests, and heavy-metal leaching test. Characteristics and advantages of the slag were studied by comparing slag and cement in various methods.

토목 및 건설업에서 시멘트는 대표적인 재료로써 가장 많이 쓰이며 생산되고 있다. 시멘트의 생산에 따른 이산화탄소의 배출로 인해 지구온난화 및 환경오염 문제는 오래 전부터 해결하지 못한 문제이다. 이러한 시멘트의 대체재로써 철강사업의 산업부산물인 고로슬래그를 활용하여 건설재료 및 토목재료로써 활용하기 위해 많은 연구가 활발하게 진행되고 있다. 이에 대한 일환으로 이 연구에서는 고로슬래그 분말을 활용하여 친환경 그라우트의 개발 및 활용성을 위하여 물리화학적 특성을 규명하는 것을 연구목적으로 정하였다. 고로슬래그는 분말자체가 가지고 있는 잠재수경성으로 인해 시멘트 그라우트 대체 재료로 활용되며 장기강도의 증진과 내부조직의 치밀화 등이 가능하다는 장점을 가지고 있으며, 매년 대량 생산되는 산업부산물인 고로슬래그를 그라우트재로 활용한다면 친환경성과 더불어 큰 경제성을 확보 가능하다는 장점이 있다. 그라우트재로서 고로슬래그의 물리화학적 특성을 알아보기 위해 겔화타임 측정 실험, 일축압축강도실험과 내구성 실험, 중금속 용출시험 등을 통하여 환경성 평가실험을 진행하여 고로슬래그를 활용한 무시멘트 그라우트의 최적 배합비 및 물리적 특성에 대하여 고찰하였다.

Keywords

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Fig. 1. Gel time test (a) A&B solution (b) Repetitive mixing

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Fig. 2. Gel time with concentrate of slaked lime

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Fig. 2. Fabrication of test specimens (a) Specimen(A&B) (b) Grout curing

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Fig. 3. Underwater curing

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Fig. 4. Uniaxial compressive strength test

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Fig. 5. Uniaxial compressive strength according to the slaked lime ratio

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Fig. 6. Uniaxial compressive strength average according to the slaked lime ratio

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Fig. 7. Durability change test

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Fig. 8. Initial state of test specimen (a) Slag specimen (b) Cement specimen

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Fig. 9. After 4 weeks state of test specimen (a) Slag specimen (b) Cement specimen

Table 1. KS of Blast Furnace Slag(BFS)

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Table 2. Rapidly hardening mixing for field

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Table 3. Mixing ratio by conditions of cement and BFS

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Table 4. Durability change of Cement and BFS

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Table 5. Heavy metal test

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