使用生态水泥、再生骨料制备再生混凝土.分别通过快速浸出实验和长期连续浸出实验对混凝土中的重金属进行浸取,并采用原子吸收光谱法检测浸出溶液中的重金属含量,对比研究再生混凝土与普通混凝土重金属浸出性能差异.研究发现,快速浸出实验条件下,再生混凝土浸出液各重金属浸出浓度高于普通混凝土浸出浓度,但仍低于《危险废物鉴别标准浸出毒性鉴别》(GB5085.3-2007)标准规定的限值.快速浸出实验条件下重金属浸出量与重金属总量相关性不显著,说明快速实验方法有局限性.长期连续浸出实验结果表明,再生混凝土各重金属元素的扩散系数高于普通混凝土(除Zn外),这是由再生混凝土独特的显微结构引起的.%The recycled concrete was prepared by eco-cement and recycled aggregate. The recycled concrete and ordinary concrete was leached by rapid leaching test and long-term leaching test. The heavy metals concentration in leachate was detected by atomic absorption spectrometry. The results of rapid leaching test demonstrated that heavy metals concentration in leachate of recycled concrete was higher than that of ordinary concrete. However, the heavy metals concentration in leachate of recycled concrete was still lower than the limitation of identification standard for hazardous wastes (GB 5085. 5-2007). The correlation between leaching content of heavy metals with the total amount of heavy metals was not significant , which indicated that the rapid leaching method had some limitations. The results of long-term leaching test showed that the diffusion coefficient of heavy metals in recycled concrete was higher than that of ordinary concrete, which was caused by the unique microstructure of recycled concrete.
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