Proceedings of the Korean Institute of Building Construction Conference (한국건축시공학회:학술대회논문집)

The Korean Institute of Building Construction (한국건축시공학회)
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Changing Features of pH at the Cyclic Aggregate According to Mixing Ratio of Sodium Phosphate and Ammonium Chloride

인산나트륨과 염화암모늄의 혼입 비율에 따른 순환골재의 pH 변화특성

  • Gao, Shan ;
  • Lee, Gun-Cheol ;
  • Lee, Gun-Young ;
  • Chio, Jung-Gu ;
  • Ko, Dong-Guen
  • 高 (한국교통대학교 건축공학과) ;
  • 山 (한국교통대학교 건축공학과) ;
  • ;
  • 이건철 (한국교통대학교 건축공학과) ;
  • 이건영최중구고동근 (한국교통대학교 건축공학과)
  • Published : 2015.11.14
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Abstract

Recycled aggregate used in a site is strong alkali due to calcium hydroxide attached on its surface. Accordingly, many environmental problems arise. Therefore, as basic research to reduce pH of recycled aggregate, this study tries to reduce the strong alkalinity of recycled aggregate by using mixture solution based on sodium phosphate and ammonium chloride. As a result, original aggregate has the strong alkalinity of pH 11.23, whereas pH of recycled aggregate immersed in mixture solution decreased as more mixture rate increased, and mostly pH 9.8 or less was found.

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