DOI QR코드

DOI QR Code

A Study on the Quality Properties When Applying Recycled Aggregate Concrete for the Construction Standard Mitigation

건축기준 완화를 위한 순환골재 콘크리트 적용 시의 품질 특성 연구

  • 우경섭 (건국대학교 건축공학과) ;
  • 김정호 (한라엔컴(주) 기술연구소) ;
  • 이세현 (한국건설기술연구원) ;
  • 오중근 (건국대학교 건축공학과)
  • Received : 2020.04.07
  • Accepted : 2020.05.21
  • Published : 2020.06.30

Abstract

The volume of construction waste material from the entire waste material volume in Korea is approximately 47.3% to take the biggest ratio, and from them, the waste concrete takes up approximately 62.8% that recycling is an urgent issue to address. Therefore, the government recommends more diverse and broader facilitation of the recycled aggregate in order to promote recycling the construction waste materials. In addition, when using concrete recycled aggregate in building, building standard such as floor area ratio and building height are being mitigation. The standard is a condition that mitigation the floor area ratio by up to 15% when using up to 25% of concrete recycled aggregate. Therefore, this study reviewed the relaxation of construction of construction standards when using concrete recycled aggregate in order to actively recommend the use of concrete recycled aggregate. And using the recycled coarse aggregate among the recycled aggregate, the appropriate mixing time in the batch plant according to the substitution rate was derived. In addition, using recycled aggregate admixture in order to improve the drying shrinkage, did comparative analysis about physical and mechanical property of concrete.

우리나라는 전체 폐기물 발생량 중 건설폐기물 발생량은 약 47.3%로 가장 많은 비중을 차지하고 있고 그 중 폐콘크리트가 약 62.8%로 재활용이 시급한 상황이다. 이에 정부는 건설폐기물의 재활용을 촉진하기 위해 순환골재의 다양하고 폭넓은 활용을 권장하고 있다. 또한 건축물에 콘크리트용 순환골재를 사용할 경우 용적률, 건축높이 등 건축기준을 완화해주고 있다. 그 기준은 콘크리트용 순환골재 최대 25% 사용 시 용적률을 최대 15% 완화해 주는 조건이다. 이에 본 연구는 순환골재의 콘크리트용으로의 사용을 적극 권장하고자 콘크리트용 순환골재 사용 시 건축기준의 완화 내용을 검토하였고 순환골재 중 순환굵은골재을 사용하여 치환율에 따른 배치플랜트에서의 적정 혼합시간을 도출하였다. 또한 건조수축 개선을 위해 순환골재용 혼화제를 사용하여 순환굵은골재 치환율별 콘크리트의 물리, 역학적 특성에 대해 비교 분석하여 건조수축 개선 효과를 나타내어 향후 현장에 안정적으로 적용이 가능할 것으로 판단된다.

Keywords

References

  1. Lee, J., Lee, B. C., Cho, Y. K., and Jung, S. H. (2016), Chloride diffusivity of concrete using recycled aggregate by strength levels, Journal of the Korea Institute for Structural Maintenance and Inspection, 20(2), 102-109. https://doi.org/10.11112/jksmi.2016.20.2.102
  2. Ryou, J. S. (2003), An experimental study on the effect of recycled aggregate on concrete properties, Magazine of concrete Research, 54(1), 7-12. https://doi.org/10.1680/macr.2002.54.1.7
  3. Silva, R. V., de Brito, J., and Dhir, R. K. (2014), Properties and composition of recycled aggregates from construction and demolition waste suitable for concrete production, Construction and Building Materials, 65(29), 201-217. https://doi.org/10.1016/j.conbuildmat.2014.04.117
  4. Katz, A. (2003), Properties of concrete made with recycled aggregate from partially hydrated old concrete, Cement and Concrete Research, 33, 703-711. https://doi.org/10.1016/S0008-8846(02)01033-5
  5. Korean Ministry of Environment (2014), Basic plan for recycling construction waste (2nd).
  6. Lee, W. S., Yun, H. D., Kim, S. W., Choi, K. S., You, Y. C., and Kim, K. H. (2007), The Effect of replacement ratio of recycled coarse aggregate on shear strength of reinforced concrete beams without shear reinforcement, Journal of the Architectural Institute of Korea Structure & Construction, 23(10), 3-10.
  7. Nam, J. W., Kim, H. J., Kim, S. B., Kim, J. H. Jay and Byun, K. J. (2007), Evaluations of Structural Performance of Recycled Aggregate Concrete According to Replacement Ratios, Journal of the Korean Recycled Construction Resources Institute, (4), 54-64.