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

提出了一种利用混凝土化学降解和粉磨工序回收废弃混凝土骨料的新工艺。将废弃混凝土浸泡在酸性溶液中，然后用搅拌磨机进行自磨，考察了骨料的回收率。结果表明，浸酸能有效地提高回收率，尤其是硝酸浸泡时，回收率可达70%左右。回收的骨料也被证实是没有使用限制的优质骨料。

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.