Material Recycling Process for Waste Concrete

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  • Iizuka Atsushi
    Research Center for Sustainable Materials and Engineering, Institute of Maltidisciplinary Reseach for Advanced Materials, Tohoku University
  • Yamasaki Akihiro
    Department of Materials and Life Science, Faculty of Science and Technology, Seikei University
  • Yanagisawa Yukio
    Department of Environment Systems, Graduate School of Frontier Sciences, the University of Tokyo

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  • 廃コンクリートのマテリアルリサイクルプロセス
  • ハイコンクリート ノ マテリアルリサイクルプロセス

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Abstract

Development of a material recycling process for waste concrete is an urgent issue. This paper summarizes the current situation of the issue, and introduces new waste concrete recycling processes via carbonic acid treatment. In the processes, alkaline calcium compounds in the hydrated cement part of waste concrete are extracted and precipitated as calcium carbonate (CaCO3). By utilizing this reaction, CaCO3 and clay alternative material can be produced from waste cement particles. Furthermore, combined use of the carbonic acid treatment and conventional mechanical grinding allows fine aggregates to be recycled from waste concrete. The process does not need any additional materials except water and carbon dioxide (CO2). The process is considered to be a promising option for waste concrete recycling.

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