Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Study on Performance of pH Reducing Agent Applied for Wet Process of Recycled Aggregate

습식 순환골재의 생산공정에 적용 가능한 pH 저감제의 성능 검토

  • Choi, Jung-Gu (Department of Architectural Engineering, Korea National University of Transportation) ;
  • Lee, Gun-Cheol (Department of Architectural Engineering, Korea National University of Transportation)
  • 최중구 (한국교통대학교 건축공학과) ;
  • 이건철 (한국교통대학교 건축공학과)
  • Received : 2015.12.15
  • Accepted : 2015.12.24
  • Published : 2015.12.30
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Abstract

Construction waste is recycled and used for the efficient and eco-friendly disposal of construction waste increasing due to reconstruction and redevelopment project and so on. There is recycled aggregate as a typical case. And this recycled aggregate shows strong alkalinity due to calcium hydroxide, and causes many environmental problems. Therefore, this is a study on reduction in the strong alkalinity of recycled aggregate by using sodium phosphate based ammonium in order to reduce the pH of recycled aggregate. Besides, a possibility that a pH reducing agent of recycled aggregate could be applied to a site was evaluated. As a result, it was possible to verify that pH decreased as the percentage of pH reducing agent increased. It is thought that the pH reducing agent can be applied to a site by methods such as immersion and spray using the pH reducing agent in the process of producing recycled aggregates.

재건축 재개발 사업 등으로 인하여 증가하는 건설폐기물을 효율적이고 친환경적으로 처리하기 위하여 건설폐기물을 재활용하여 사용하고 있다. 대표적으로 순환골재가 있으며, 이는 수산화칼슘에 의하여 높은 강알칼리성을 나타내며 많은 환경문제를 발생시키고 있다. 따라서 본 연구는 순환골재의 pH를 저감하기 위해 인산나트륨계암모늄염을 사용하여 순환골재의 강알칼리성을 감소시키기 위한 연구이다. 또한, 순환골재 pH 저감제의 현장적용 가능성을 평가하였다. 그 결과 pH 저감제 비율이 증가할수록 pH가 감소하는 것을 확인할 수 있었으며 순환골재 생산과정 중 pH 저감제를 이용한 침지, 분사 등의 방법으로 현장적용이 가능할 것으로 판단된다.

Keywords

References

  1. Jung, M.I. (2012). Development of Duplex Screen Net Trommel with pH Reduction Function of Recycled Aggregate, Master's Thesis, Mokpo National University, Korea.
  2. Kim, J.B., Lee, S.H. (2011). pH Reduction Technology Demonstration of Recycled Aggregate [Final Report(complete version)], Ministry of Environment [in Korean].
  3. Korea Institute of Construction Technology. (2011). Recycling Basic Plan of the Second-Order Construction Waste, Korea.
  4. Korea Institute of Construction Technology. (2014). Promotion Result Report on pH Test Method Preparation of Recycled Aggregate, Korea.
  5. Lee, I.S., Bok, Y.J., Hong, S.R., Kim, J.M. (2012). An experimental study for reduction pH of recycled aggregate, Journal of the Korea Concrete Institute, 24(2), 819-820 [in Korean].
  6. Lee, J.C., Yoon, S.H., Lee, S.H., Kim, J.B. (2011). A study on the optimization of recycled aggregate alkalinity reducing facility in the field, Journal of the Korean Recycled Construction Resources Institute, 6(3), 53-60 [in Korean].
  7. Ministry of Environment. (2003). Construction Waste Recycling Promotion Act, Korea.
  8. Ministry of Environment. (2013). National Waste Generation and Treatment Status, Korea.
  9. Yoon, S.H., Lee, S.H., Lee, J.C. (2011). A study on the pH characteristic of recycle aggregate according to test methods and elapsed time, Journal of the Korean Recycled Construction Resources Institute, 6(3), 61-68 [in Korean].