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Effect of Concrete Containing the Biochar on Properties and Thermal Insulation Performance

바이오차를 혼입한 콘크리트의 물성 특성과 단열성능에 미치는 영향

  • 김경철 (한국건설기술연구원 남북한인프라특별위원회 북방인프라특화팀) ;
  • 임광모 (한국건설기술연구원 남북한인프라특별위원회) ;
  • 손민수 (한국건설기술연구원 남북한인프라특별위원회 한반도인프라협력팀) ;
  • 류금성 (한국건설기술연구원 구조연구본부) ;
  • 고경택 (한국건설기술연구원 남북한인프라특별위원회)
  • Received : 2022.11.07
  • Accepted : 2022.11.30
  • Published : 2022.12.30

Abstract

This study intends to develop an eco-friendly concrete panel mixed with biochars. Experiments about mechanical and thermal properties were conducted on porous biochar concrete, which has insulation and carbon-capture performance. The concrete has a mixing ratio of 0, 5, 10, and 15 % for biochar and a water-binder ratio of 0.35. The unit weight, porosity, and permeability were measured to evaluate the mechanical characteristics. From the results, as the biochar mixing rate increased, the porosity and the permeability increased, but the unit weight decreased. Even though a decreased trend was observed in the compressive strength results, they satisfied the design standard. Since the thermal conductivity was decreased during the increase of contents, biochar could be considered an excellent material for insulation performance. In addition, regression analyses were conducted regarding the relationship of unit weight with porosity, compressive strength with thermal conductivity, and porous with thermal conductivity. From the regression, significant variables for expanding the scope of the application of biochar were presented.

본 연구에서는 바이오차를 혼입한 친환경 콘크리트 패널을 개발하고자 한다. 단열성능과 탄소 포집이 가능한 바이오차를 혼입시킨 다공성 콘크리트의 물리적 특성, 역학적 특성 및 열적 특성 실험을 수행하였다. 다공성 콘크리트 배합은 바이오차 혼입율 0, 5, 10 및 15 %와 물-시멘트 비를 0.35로 고정하여 배합조건을 구성하였다. 기본 역학적 특성을 평가하기 위해 단위중량, 총 공극률 및 투수계수를 측정하였다. 바이오차 혼입율이 증가함에 따라 총 공극률과 투수계수는 증가하지만 단위중량은 감소하였다. 콘크리트 압축강도는 바이오차 혼입율이 증가할수록 감소하지만 설계기준 압축강도 이상을 확보하였다. 열전도율은 바이오차 혼입율이 증가할수록 감소하는 경향을 나타내어 단열성능에 뛰어난 재료임을 증명하였다. 또한 회귀분석을 통해 다공성 콘크리트의 단위중량, 총 공극률, 콘크리트 압축강도 및 열전도율과 상관관계를 제시하였다. 상관관계 분석을 통해 바이오차의 적용 범위를 확대하기 위한 주요 변수를 제시하였다.

Keywords

Acknowledgement

본 연구는 과학기술정보통신부 한국건설기술연구원 연구운영비지원(주요사업)사업으로 수행되었습니다(과제번호 20220140-001, 남북한 공동번영을 위한 인프라 통합⋅연계 기반 구축 연구).

References

  1. Akhtar, A., Sarmah, K. (2018a). Novel biochar-concrete composites : manufacturing, characterization and evaluation of the mechanical properties, Science of The Total Environment, 616-617, 408-416. https://doi.org/10.1016/j.scitotenv.2017.10.319
  2. Akhtar, A., Sarmah, K. (2018b). Strength improvement of recycled aggregate concrete through silicon rich char derived from organic waste, Journal of Cleaner Production, 196, 411-423. https://doi.org/10.1016/j.jclepro.2018.06.044
  3. Choi, W.C., Yun, H.D., Lee, J.Y. (2012). Mechanical properties of mortar containing bio-char from pyrolysis, Journal of the Korea Institute for Structural Maintenance and Inspection, 16(3), 67-74 [in Korean]. https://doi.org/10.11112/jksmi.2012.16.3.067
  4. Choi, W.G., Park, H.R., Suh, S.J. (2004). A fundamental study for the development of building materials using the charcoal, Journal of the Architectural Institute Korea, 20(3), 185-192 [in Korean].
  5. Cosentino, I., Restuccia, L., Ferro, G.A., Tulliani, J.M. (2019). Type of materials, pyrolysis conditions, carbon content and size dimensions: the parameters that influence the mechanical properties of biochar cement-based composites, Theoretical and Applied Fracture Mechanics, 103, 102261. 1-10.
  6. Gupta, S., Wei, K.H., Dai, P.S. (2020). Effect of biochar on mechanical and permeability properties of concrete exposed to elevated temperature, Construction and Building Materials, 234, 117338, 1-16.
  7. Khushnood, R.A., Ahmad, S., Restuccia, L., Spoto, C., Jagdale, P., Tuliani, J.M., Giuseppe, A.F. (2016). Carbonized nono/microparticles for enhanced mechanical properties and electromagnetic interference shielding of cementitious materials, Frontiers of Structural and Civil Engineering, 10, 209-213. https://doi.org/10.1007/s11709-016-0330-5
  8. Kim, Y.M., Choi, H.Y., Chung, Y.G., Ryu, H.G. (2006). A study on the properties and friendly environment efficiency charcoal concrete bricks, Journal of the Korea Institute of Building Construction, 6(1), 123-130 [in Korean].
  9. Restuccia, L., Ferro, G.A. (2016). Nonoparticles from food waste: a "green" future for traditional building materials, 9th International Conference on Fracture Mechanicals of Concrete and Concrete Structures, 1-6.
  10. Restuccia, L., Reggio, A., Ferro, G.A., Kamranird, R. (2017). Fractal analysis of crack paths into innovative carbon-based cementitious composites, Theoretical and Applied Frature Mechanics, 90, 133-141.
  11. Woolf, D., Amonette, J.E., Street-Perrott, F.A., Lehmann, J., Joseph, S. (2010). Sustainable biochar to mitigate global climate change, Nature Communications, 1, 1-16.