Development of a new recycling process of the aggregate recovered from waste concrete

Research Project

Project/Area Number	23656484
Research Category	Grant-in-Aid for Challenging Exploratory Research
Allocation Type	Multi-year Fund
Research Field	Properties in chemical engineering process/Transfer operation/Unit operation
Research Institution	Yamagata University
Principal Investigator	HASEGAWA Masahiro 山形大学, 大学院・理工学研究科, 教授 (50007209)
Project Period (FY)	2011 – 2012
Project Status	Completed (Fiscal Year 2012)
Budget Amount *help	¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000) Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000) Fiscal Year 2011: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords	粉粒体操作 / リサイクル / 骨材 / 廃コンクリート / 酸溶液 / 劣化反応 / 撹拌ミル / コンクリート / 骨材分離 / 粉砕操作 / 分離度
Research Abstract	A new recycling process of the aggregate from waste concrete was suggested by using the chemical degradation of concrete and the grinding operation. After the waste concrete was immersed into some acid solutions and then was ground autogenously by a stirred-mill, the recovery ratio of the aggregate was investigated. The results were revealed that the recovery ratio increased effectively with the acid immersion, and especially was attained to about 70% in the case of a nitric acid immersion. The aggregate recovered was also confirmed to be high quality aggregate without usage restrictions.

Report

(3 results)