Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Hydration properties of OPC with Synthesized Calcium Alumino Ferrite(CAF)

합성 Calcium Alumino Ferrite(CAF) 치환량에 따른 시멘트 수화 특성

  • Woong-Geol Lee (Research Center of Advanced Convergence Process on Materials, Kangwon University) ;
  • Myong-Shin Song (Research Center of Advanced Convergence Process on Materials, Kangwon University)
  • 이웅걸 (강원대학교 삼척캠퍼스 재료융합공정연구소) ;
  • 송명신 (강원대학교 삼척캠퍼스 재료융합공정연구소)
  • Received : 2022.11.28
  • Accepted : 2023.02.24
  • Published : 2023.03.30
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Abstract

The cement is a typical CO2 emission industry. Manufacturing process improvements and increased use of alternative materials are needed to reduce energy consumption and CO2 emissions. This study confirmed the basic characteristics of cement hydration by sintering CAF at low temperature as a CO2 adsorbent material. For the hydration product of the synthetic CAF, crystal phase analysis, porosity, and structural images were confirmed, and the compressive strength was measured. The replacement rate of SCAF was 10, 20, and 100 %, and the compressive strength tended to decrease as the replacement rate increased. In addition, when the SCAF substitution rate is 100 %, the hydration products of the early age are calcium aluminum oxide hydrate (Ca3Al2O6 x H2O) and calcium iron hydroxide (Ca3Fe(OH)12), and at substitution rates of 10 and 20 %, CAF compounds other than general cement hydrates brownmillerite was observed. As for the porosity, the pore size increased and the porosity increased with the increase of the replacement ratio. As a result of this study, CAF manufactured by low-temperature sintering seems to be difficult to use alone and general curing for utilization as a CO2 adsorbing material.

시멘트는 대표적인 이산화 탄소 배출 산업이다. 에너지 소비와 CO2 배출 저감을 위해 제조 공정 개선 및 대체 재료의 사용확대가 필요하다. 따라서 본 연구는 CO2 흡착형 재료인 CAF을 저온 소성하여 시멘트에 적용하여 시멘트 수화의 기본 특성을 확인하였다. 합성 CAF의 수화 생성물에 대한 결정상 분석과 공극 분포, 그리고 구조 이미지를 확인하고, 압축강도를 측정하였다. SCAF는 치환율은 10, 20, 100 %으로 하였으며, 치환율의 증가에 따라 압축강도는 저하되는 경향을 보인다. 또한, SCAF 치환율 100%인 경우, 초기 재령의 수화 생성물은 calcium aluminum oxide hydrate (Ca3Al2O6·xH2O)와 calcium iron hydroxide (Ca3Fe(OH)12)이며, 치환율 10, 20 %에서는 일반적인 시멘트 수화물 외에 CAF 화합물인 Brownmillerite가 관찰되었다. 또한, 공극율은 치환율의 증가에 따라 공극 크기가 크고 공극율이 높았다. 본 연구 결과 저온 소성으로 제조된 CAF는 CO2 흡착형 재료로 활용을 위해 단독 사용 및 일반 양생은 어려울 것으로 보인다.

Keywords

Acknowledgement

본 연구는 국토교통부/국토교통과학기술진흥원의 지원으로 수행되었음(과제번호: 21CTAP-C163942-01).

References

  1. Alarcon-Ruiz, L., Platret, G., Massieu, E., Ehrlacher, A. (2005). The use of thermal analysis in assessing the effect of temperature on a cement paste, Cement and Concrete Research, 35(3), 609-613. https://doi.org/10.1016/j.cemconres.2004.06.015
  2. Bae, S.C., Moon, J.H., Nam, J.S. (2022). Global status of cement comcrete carbon neutrality, Magazine of the Korea Conctre Institure, 34(1), 50-57 [in Korean].
  3. Carlson, E.T. (1964). Action of water on calcium aluminoferrites, Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry, 68(5), 453.
  4. Chen, C.H., Chiou, J., Wang, K.S. (2006). Sintering effect on cement bonded sewage sludge ash, Cement and Concrete Composites, 28(1), 26-32. https://doi.org/10.1016/j.cemconcomp.2005.09.003
  5. Damtoft, J.S., Lukasik, J., Herfort, D., Sorrentino, D., Gartner, E.M. (2008). Sustainable development and climate change initiatives, Cement and Concrete Research, 38(2), 115-127. https://doi.org/10.1016/j.cemconres.2007.09.008
  6. Hanein, T., Glasser, F.P., Campbell Bannerman, M.N. (2015). Thermodynamics of Portland cement clinkering, Proceedings of 14th International Congress on the Chemistry of Cement. ICCC, Beijing, China.
  7. Hwang, K.R. (2002). Current technical tendency of concrete using fly ash, Magazine of the Korea Concrete Institute, 14(5), 96-103 [in Korean]. https://doi.org/10.22636/MKCI.2002.14.6.96
  8. Juenger, M.C.G., Winnefeld, F., Provis, J.L., Ideker, J.H. (2011). Advances in alternative cementitious binders, Cement and Concrete Research, 41(12), 1232-1243. https://doi.org/10.1016/j.cemconres.2010.11.012
  9. Kim, I., Seol, S.Y., Kim, H.S., Lee, J.Y. (2020). Comparison of comparison of environmental performance for 3 types of cement by EU PEF guide, Korean Journal of Life Cycle Assessment), 21(1), 23-26 [in Korean].
  10. Lee, W.G., Song, M.S. (2022). CO2 adsorption reactions of synthetic calcium aluminum ferrite (CAF), Applied Sciences, 12(13), 6677 [in Korean].
  11. Malhotra, V.M. (2002). Introduction: sustainable development and concrete technology, Concrete International, 24(7), 22.
  12. Rose, J., Benard, A., El Mrabet, S., Masion, A., Moulin, I., Briois, V., Olivi, L., Bottero, J.Y. (2006). Evolution of iron speciation during hydration of C4AF, Waste Management, 26(7), 720-724. https://doi.org/10.1016/j.wasman.2006.01.021
  13. Song, K.I., Yang, K.H., Lee, B.Y., Song, J.K. (2012). Carbonation characteristics of alkali activated balst furnace slag mortar, Journal of the Korea Concrete Institute, 24(3), 315-322 [in Korean]. https://doi.org/10.4334/JKCI.2012.24.3.315