광촉매-분산 실리카 함침 콘크리트의 내구성 및 정화성능 평가
Evaluation of Durability and Self-clearing in Concrete Impregnated with Photocatalyst-colloidal Silica
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초록
콘크리트는 장기간 사용환경에 노출되면서 다양한 표면열화과정을 거친다. 실리케이트 기반 함침제는 콘크리트 표면에 적용되어불용성 수화물을 형성하는데, 이 과정에서 다양한 공학적 장점을 기대할 수 있다. 본 연구는 분산형 실리케이트를 사용하여 표면의 내구성능을강화하고 이후 광촉매를 분무함으로서 표면 함침된 콘크리트의 자기정화능력을 평가하는 것이다. 이를 위해 실리케이트 함침 콘크리트에 대하여 압축강도 뿐 아니라, 흡수성, 건조 수축, 염소이온저항성, 황산저항성, 동결융해 저항성 등과 같은 내구성 실험이 수행되었다. 또한 아세트알데이드 및 메틸렌블루 반응 평가를 통하여 독성카스의 제거와 자기정화성능을 평가하였다. 실리케이트 함침 후 광촉매 도포를 함으로서 광촉매의 부착성을 확보할 수 있었으며, 콘크리트의 내구성 개선과 광촉매 고유의 정화성능을유지할 수 있었다.
Abstract
Concrete undergoes various deterioration on surface. Impregnant with silicate is usually applied to concrete surface and forms insolublehydrates, which can provide many engineering advantages. In the work, concrete impregnated with colloidal silicate is used for durability enhancementin surface and self-clearing performance is evaluated with photocatalyst-TiO2 spraying. For the work, various tests are performed both for strengthevaluation and durability evaluation such as absorption ratio, drying shrinkage, chloride penetration, sulfate resistance, and freezing/ thawing action. Furthermore, removal and self-clearing performance are evaluated with Acetaldehyde decomposition and Methylene blue decolorization. Throughsilicate impregnation and photocatalyst spraying, the impregnated concrete can have not only durability enhance but also self-clearing performance.
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