Proceedings of the IEEK Conference (대한전자공학회:학술대회논문집)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Quality Improvement of Recycled Aggregates from Waste Concrete by the heating and grinding

  • Kim, Hyung-Seok (Korea Institute of Geoscience and Mineral Resources) ;
  • Han, Gi-Chun (Korea Institute of Geoscience and Mineral Resources) ;
  • Ahn, Ji-Whan (Korea Institute of Geoscience and Mineral Resources) ;
  • Park, Jae-Seok (Korea Institute of Construction Materials) ;
  • Kim, Hwan (School of Materials Science and Eng., Seoul National University) ;
  • Kim, Kyung-Soo (Ministry Construction & Transportation)
  • Published : 2001.10.01
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Abstract

To examine the grinding effect through preheating of waste concrete as a way of retrieving coarse aggregates from waste concrete, the removal rates of cement mortar and paste of both recycled aggregates and heated and grinded ones were investigated. As the preheating temperature increased, the removal rate of cement mortar from waste concrete was raised, and this kind of removal hardly affected the abrasion rate and specific gravity of aggregates. On the other hand, when it was treated over 40$0^{\circ}C$ of preheating temperature, the absorptance was reduced to less than 2.17, and cement mortar was effectively separated from waste concrete. It could meet the Korean Standards on recycled aggregates for concrete, and it is expected to expand the scope of utilization by making it possible to retrieve the aggregates which have the properties close to natural aggregates.

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