Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
권호 표지
DOI QR코드

DOI QR Code

Analysis of carbonation characteristics on waste concrete

폐콘크리트의 탄산화 특성 분석

  • Kim, Nam Il (Low-carbon & DX R&D Division, Korea Institute of Ceramic Engineering & Technology) ;
  • Lee, Jong Tae (Low-carbon & DX R&D Division, Korea Institute of Ceramic Engineering & Technology) ;
  • Chu, Yong Sik (Low-carbon & DX R&D Division, Korea Institute of Ceramic Engineering & Technology)
  • 김남일 (한국세라믹기술원 저탄소&디지털 전환사업단) ;
  • 이종태 (한국세라믹기술원 저탄소&디지털 전환사업단) ;
  • 추용식 (한국세라믹기술원 저탄소&디지털 전환사업단)
  • Received : 2022.07.28
  • Accepted : 2022.08.16
  • Published : 2022.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, the waste concrete sample obtained as various particle size (0~2.36 mm) was carried out the basic measurements and carbonation for analyzing the possibility of its carbonation. It was then investigated some analysis such as crystallization (XRD pattern), microstructure (SEM), and the production of CaCO3 through the ignition loss (TG-DTA). The content of CaCO3 in the waste concrete sample before carbonation was found in 14.51 % and 28.52 % after carbonation in 24 hours. Moreover, the content of CaCO3 carbonated in 24 hours with fine grinded waste concrete sample was 32.73 %. The carbonation of the waste concrete sample was rapidly performed up to 6 hours, but gradually increased from 12 to 24 hours. Especially, the amount of CaCO3 between 12 and 24 hours was only produced 2.32 %. The calcite-shaped CaCO3 crystals after carbonation of the waste concrete sample were found in microstructure and their peaks were strongly detected on XRD pattern.

본 연구에서는 폐콘크리트 분쇄물의 탄산화 가능성 검토를 위해 폐콘크리트 분쇄물의 기초물성 측정 및 탄산화를 실시하였으며, 탄산화 시료의 CaCO3 생성량, 결정성 분석 및 미세구조를 관찰하였다. 폐콘크리트 분쇄물의 탄산화 전 CaCO3 함량은 14.51 %이었으며, 24시간 탄산화 시 CaCO3 함량은 28.52 %, 미분쇄 후 24시간 탄산화 시의 CaCO3 함량은 32.73 %이었다. 탄산화 시간에 따른 폐콘크리트 분쇄물의 탄산화는 초기 6시간까지 급격히 이루어졌으나, 12시간 이후 24시간까지의 탄산화는 서서히 진행되었다. 특히 12시간 이후 24시간까지의 CaCO3 생성량은 2.32 % 수준에 불과하였다. 폐콘크리트 탄산화 후 미세구조 관찰 시 calcite 형상의 CaCO3 결정을 발견할 수 있었으며, 또한 XRD 패턴에서도 동일 결정 피크를 검출할 수 있었다. 따라서 본 연구에서 생성된 CaCO3 결정은 calcite라는 것을 확인할 수 있었다.

Keywords

References

  1. Generation of construction waste and waste concrete in korea, National statistics portal, Korea statistical office Homepage.
  2. H.Y. Shin, S.W. Ji, J.Y. Woo, G.O. Ahn and S.H. An, "A feasibility study on the utilization of by-product sludge generated from waste concrete recycling process", J. KIRR 25 (2016) 29.
  3. C.S. Na and J.H. Park, "Production facilities and manufacturing technology of recycled aggregate", J. Rec. Const. Resources 5 (2010) 15.
  4. D.G. Kim, K.H. Yang, E.A. Seo and H.S. Yoon, "Assessment on the physical and chemical properties of granulated ground waste concrete powders compiled from waste concrete and mortar", JKCI 33 (2021) 327.
  5. J.C. Ahn, J.H. Lee and B.H. Kang, "Properties of recycle cement made of cementitious powder from concrete waste by conditions of burning", AIK 19 (2003) 109.
  6. X. Chen, Y. Li, Z. Zhu and L. Ma, "Evaluation of waste concrete recycled powder on the preparation of low exothermic cement", J. Bulid. Eng. 53 (2022) 104511.
  7. Y. Wu, H. Mehdizadeh, K.H. Mo and T.C. Ling, "High-temperature CO2 for accelerating the carbonation of recycled concrete fines", J. Bulid. Eng. 52 (2022) 104526.
  8. Y. Zhang, H. Chen and Q. Wang, "Accelerated carbonation of regenerated cementitious materials from waste concrete for CO2 sequestration", J. Bulid. Eng. 55 (2022) 104701.
  9. M. Zajac, J. Skibsted, F. Bullerjahn and J. Skocek, "Semi-dry carbonation of recycled concrete paste", J CO2 Util. 63 (2022) 102111.
  10. X. Xian, D. Zhang and Y. Shao, "Flue gas carbonation curing of cement paste and concrete at ambient pressure", J. Clean. Prod. 313 (2021) 127943.
  11. L. Liu, Y. Liu, X. Tian and X. Chen, "Superior CO2 uptake and enhanced compressive strength for carbonation curing of cement based materials via flue gas", Constr Build Mater. 346 (2022) 128364.
  12. K. Okano, S. Miyamaru, A. Kitao, H. Takano, T. Aketo, M. Toda, K. Honda and H. Ohtake, "Amorphous calcium silicate hydrates and their possible mechanism for recovering phosphate from seawater", Sep. Purif. Technol. 144 (2015) 63.
  13. D. Wang, Y. Fang, Y. Zhang and J. Chang, "Changes in mineral composition, growth of calcite crystal, and promotion of physico-chemical properties induced by carbonation of β-C2S", J CO2 Util. 34 (2019) 149.