新材料・新工法(材料)2／ジオポリマー・アルカリ活性材料1

[1279] 析出型炭酸カルシウムコンクリート製造プロセス中のアラゴナイト生成と微細構造変化

周青松¹, 王偉¹, 丸山一平¹, 野口貴文¹ (1.The University of Tokyo)

キーワード：demolished concrete、heterogeneous precipitation、Ca extraction、wet carbonation、binder distribution

A calcium carbonate concrete (CCC) was made based on recycled concrete fines (RCFs) and CO2. Results showed that the hardening mechanism of RCFs-based CCC is due to the entangled aragonite crystals generated at the contacting areas of particles. A dual precipitation process happened in the CCCmaking process, while the hardening mechanism is ascribed to the precipitation from the Ca(HCO3)2 solution. The RCFs with a cement paste layer structure tend to have a higher affinity for combining the precipitated aragonite crystals.