KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Evaluation of Hydration Characteristics and NOx-removal Performances of Cement Paste Containing Refined TiO2 Obtained from Waste Sludge

폐수 슬러지에서 정제된 TiO2를 혼입한 시멘트 페이스트의 수화특성 및 질소산화물 제거 성능 평가

  • Yoon, Hyunno (Korea Advanced Institute Science and Technology) ;
  • Seo, Joonho (Korea Advanced Institute Science and Technology) ;
  • Kim, Seonhyeok (Korea Advanced Institute Science and Technology) ;
  • Bae, Jinho (Korea Advanced Institute Science and Technology) ;
  • Kil, Taegeon (Korea Advanced Institute Science and Technology) ;
  • Lee, Haeng-Ki (Korea Advanced Institute Science and Technology)
  • 윤현노 (한국과학기술원 건설및환경공학과) ;
  • 서준호 (한국과학기술원 건설및환경공학과) ;
  • 김선혁 (한국과학기술원 건설및환경공학과) ;
  • 배진호 (한국과학기술원 건설및환경공학과) ;
  • 길태건 (한국과학기술원 건설및환경공학과) ;
  • 이행기 (한국과학기술원 건설및환경공학과)
  • Received : 2020.10.28
  • Accepted : 2021.01.14
  • Published : 2021.08.01
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Abstract

The present study investigated the hydration properties and NOx-removal performances of the cement pastes containing three different types of TiO2. Two commercially available TiO2 (P-25 and NP-400) and refined TiO2 (GST) obtained from waste sludge were incorporated to cement paste at levels of 0, 5, 10, and 20 wt%. Isothermal calorimetry test results indicated that the TiO2 incorporation induced a notable influence on the reaction kinetics of cement paste, showing the highest cumulative heat release in the samples containing P-25, followed by NP-400 and GST. Quantitative X-ray diffractometry as calculated by the Rietveld method identified that the incorporated TiO2 promoted the formation of C-S-H, ultimately leading to the enhancement in the 28 day-compressive strength of cement pastes. As revealed by SEM/EDS analysis, the content of distributed Ti elements on the surface of the samples was in the order of P-25, GST, and NP-400. Regardless, the NOx-removal performance was the highest in the sample containing P-25, followed by NP-400 and GST.

본 연구에서는 서로 다른 종류의 TiO2 혼입이 시멘트 페이스트의 수화특성 및 질소산화물 제거성능에 미치는 영향에 대해 조사하였다. 상용 제품인 P-25와 NP-400, 폐수 슬러지에서 제조된 GST, 총 세 종류의 TiO2를 시멘트 무게대비 0, 5, 10, 20 % 첨가하여 시멘트 페이스트의 수화특성 및 질소산화물 제거성능을 분석하였다. 미소수화열 측정결과 TiO2의 혼입은 시멘트 페이스트의 초기 수화반응에 큰 영향을 미치는 것이 확인되었으며, P-25, NP-400, GST 순으로 더 높은 누적 발열량을 나타내었다. 이로 인해 Rietveld 분석결과 TiO2 혼입 샘플에서 더 많은 C-S-H의 생성량이 관찰되었으며, 이는 TiO2 혼입 시멘트 페이스트의 28일 압축강도 증가에 영향을 미친 것으로 판단된다. SEM/EDS 분석결과 P-25, GST, NP-400 순으로 페이스트 샘플 표면에 더 많은 Ti 원소의 함량이 관찰되었지만, NOx 제거 성능은 P-25, NP-400, GST 순으로 우수한 것으로 확인되었다.

Keywords

Acknowledgement

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

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