KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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NOx-removal and Sound-absorption Performances of Photocatalytic Porous Concrete Prepared by Various TiO2 Application Methods

TiO2 적용방법에 따른 포러스 콘크리트의 질소산화물 제거성능 및 흡음특성

  • Yoon, Hyunno (Korea Advanced Institute Science and Technology) ;
  • Seo, Joonho (Korea Advanced Institute Science and Technology) ;
  • Kim, Seonhyeok (Korea Advanced Institute Science and Technology) ;
  • Jang, Daeik (Korea Advanced Institute Science and Technology) ;
  • Bae, Jinho (Korea Advanced Institute Science and Technology) ;
  • Lee, Haeng-Ki (Korea Advanced Institute Science and Technology)
  • 윤현노 (한국과학기술원 건설및환경공학과) ;
  • 서준호 (한국과학기술원 건설및환경공학과) ;
  • 김선혁 (한국과학기술원 건설및환경공학과) ;
  • 장대익 (한국과학기술원 건설및환경공학과) ;
  • 배진호 (한국과학기술원 건설및환경공학과) ;
  • 이행기 (한국과학기술원 건설및환경공학과)
  • Received : 2021.10.28
  • Accepted : 2022.01.25
  • Published : 2022.04.01
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Abstract

The present study investigates NOx-removal and sound-absorption performances of photocatalytic porous concrete prepared by various TiO2 application methods. Photocatalytic porous concrete samples were prepared by one of the following: 1) mechanically mixing TiO2 during casting; 2) mixing bottom ash aggregate pretreated with TiO2 during casting; and 3) spraying TiO2 solution to the normally fabricated porous concrete. The test results indicated that the mechanical mixing of TiO2 decreased the compressive strength as the added TiO2 content increased. The use of pretreated bottom ash aggregate reduced the porosity, yet the compressive strength of the concrete was similar to that measured from the former method. Porous concrete samples sprayed with the TiO2 solution exhibited enhanced compressive strength, while the porosity was analogous to those measured from other methods. The NOx-removal performance was the highest in the samples sprayed with the TiO2 solution, followed by the samples using pretreated bottom ash aggregate and mechanically mixed TiO2. The samples with mechanically mixed TiO2 identified a relationship between soundabsorption performance and porosity. However, no particular tendency was observable in the samples with other TiO2 application methods.

본 연구에서는 다양한 TiO2 적용방법이 포러스 콘크리트의 질소산화물 제거성능 및 흡음특성에 미치는 영향을 조사하였다. 포러스 콘크리트 배합과정에서 TiO2를 단순 혼입하는 방법, 바텀애쉬 골재에 TiO2를 전처리하고 이를 이용하여 포러스 콘크리트를 제조하는 방법, 마지막으로 제조된 포러스 콘크리트에 TiO2 용액을 도포하는 방법으로 TiO2 적용 포러스 콘크리트를 제조하였다. 실험결과 TiO2의 단순 혼입은 TiO2의 함량이 증가함에 따라 압축강도를 감소시켰으며, 공극률은 증가시키는 것으로 관찰되었다. TiO2 함침 바텀애쉬 골재를 이용하는 경우 압축강도는 기존 포러스 콘크리트와 유사하지만 공극률이 감소하는 것으로 나타났다. 마지막으로 표면 도포 방법의 경우 공극률은 유사하였으나 강도가 증가하였다. 질소산화물 제거성능에서 TiO2를 표면 도포한 샘플이 가장 높은 효율을 보였으며, TiO2를 단순 혼입한 샘플들보다 바텀애쉬 골재에 전처리한 샘플에서 더 높은 질소산화물 제거성능이 관찰되었다. 흡음성능의 경우 TiO2를 단순 혼입한 경우 공극률과의 상관관계를 확인할 수 있었지만, 다른 적용방법의 경우 일정한 경향이 발견되지는 않았다.

Keywords

Acknowledgement

본 연구는 국토교통부/국토교통과학기술진흥원의 지원으로 수행되었습니다(과제번호: 21SCIP-B149189-04).

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