Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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A Study on Penetration Effect of Penetrating Hardener for Prevention of Scattering of Asbestos Building Materials

석면 건축자재의 비산 방지를 위한 침투성 경화제 침투 효과에 관한 연구

  • Song, Tae-Hyeob (Department of Living and Built Environment Research, KICT) ;
  • Park, Ji-Sun (Department of Living and Built Environment Research, KICT) ;
  • Shin, Hyun-Gyoo (Material Technology Center, Korea Testing Laboratory)
  • 송태협 (한국건설기술연구원 국민생활연구본부) ;
  • 박지선 (한국건설기술연구원 국민생활연구본부) ;
  • 신현규 (한국산업기술시험원 재료기술센터)
  • Received : 2018.11.12
  • Accepted : 2018.12.18
  • Published : 2018.12.30
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Abstract

In accordance with the amendment of the Industrial Safety and Health Act of 2007, Korea completely prohibited the import, distribution and manufacture of asbestos like Europe and Japan. Accordingly, the current problem of asbestos is the safe maintenance and disposal of asbestos construction material, the disposal of asbestos, and the final disposal of asbestos building materials. In the past, Korea used 100,000 tons of asbestos every year, and the building materials using it exceeded 1 million tons per year. These asbestos building materials continued to be used until 2006, and the Ministry predicted that these materials would continue to be maintained until 2044. When the permeable hardening agent is applied to the asbestos building material installed in the pre-pretreatment step for the harmless treatment of the asbestos waste and the dismantling is carried out, the scattering of the asbestos is suppressed in the disassembling step, detoxification treatment conditions can be improved. Therefore, permeable hardeners should be stably penetrated into asbestos building materials. In this study, it is suggested that pre - pretreatment methods for the harmlessization of waste asbestos building materials with medium density level can be presented. In order to efficiently perform pre - treatment for chemical harmlessness in the future, the mixing ratio of permeable hardener and middle water Optimization is the most important factor.

2007년 산업안전 보건법의 개정에 따라 우리나라도 유럽 및 일본과 같이 석면의 수입, 유통, 제조를 완전히 금지하였다. 이에 따라 현재의 석면의 문제는 기존에 시공된 석면 건축자재의 안전한 유지관리 및 친환경 해체, 그리고 폐기된 석면 건축자재의 안정적인 최종처리에 있다고 할 수 있다. 과거 우리나라는 매년 10만 톤의 석면을 사용하였으며, 이를 사용한 건축자재는 년간 100만 톤을 초과하였다. 이러한 석면 건축자재가 2006년까지 지속적으로 사용되었고, 이러한 자재는 향후 2044년까지 계속 유지될 것으로 환경부에서 예측한 바 있다. 석면 폐기물의 무해화 처리를 위한 사전 전처리 단계로 설치되어 있는 석면 건축자재에 침투성 경화제를 도포 하고, 해체 철거를 실시하면, 해체단계에서 석면의 비산을 억제하고, 무해화 단계에서 알칼리 공급 작용을 하여 무해화 처리 조건이 개선될 수 있다. 따라서 석면 건축자재에 침투성 경화제가 안정적으로 침투될 수 있어야 한다. 본 연구에서는 sodium silicate를 주성분으로 하는 침투성 경화제와 증류수의 희석 비율에 따른 침투 효과를 비교하고자 하였다. 시험결과 K성분의 침투에 따른 침투 깊이 평가가 가능할 것으로 판단되었으며, 증류수 희석 비율이 높을수록 침투효과는 커지는 것으로 나타났다. 본 연구를 통하여 중밀도 수준의 폐석면 건축자재의 무해화를 위한 사전 전처리 방법의 제시가 가능할 것으로 사료되며, 향후 화학적 무해화를 위한 사전 전처리를 효율적으로 하기 위해서는 침투성 경화제와 중류수의 혼합비율의 최적화가 가장 중요한 요소인 것으로 나타났다.

Keywords

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Fig. 1. Chrysotile asbestos

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Fig. 2. (a), (b) SEM micrographs of asbestos fibers in ceiling materials; and (c) the corresponding EDS profile analysis for the SEM image

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Fig. 4. Mimetic diagram of damaged asbestos-containing ceiling materials

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Fig. 5. PCM-asbestos fiber concentrations measured after spread-coating the scattering prevention agent and damaging the ceiling materials

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Fig. 6. EDS analyses results(wt%)

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Fig. 7. The penetration depth of diluted scattering prevention agent

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Fig. 8. The penetration depth according to type of scattering prevention agent

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Fig. 3. Asbestos aero zone concentration tester

Table 1. Classification of asbestos

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Table 2. Physical Characteristics

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Table 3. Basic properties of scattering prevention agents

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Table 4. Elemental composition of scattering prevention agents in wt% by XRF method

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Table 5. Test conditions of airozone performance evaluation

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Table 6. EDS analyses results(wt%) on asbestos-containing ceiling materials before and after spread the scattering prevention agents

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Table 7. Viscosities of diluted scattering prevention agents with different concentration of distilled water of 0, 20, 40, 60, and 80%

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