混凝土在重金属环境中的暴露研究

摘要

Aimed at providing basic data in management of heavy metal polluted construction and demolition waste (C&DW), this paper establishes the exposure of concrete to heavy metal. Immersion of C20 concretes in Zn, Cu, Pb, Cr, Cd solution and their mixed solution was conducted in research, and analyzing the heavy metal distribution in different depths of concrete was followed. The results showed that heavy metals were concentrated at concrete surface depth of less than 1cm, heavy metal concentrations in depth beyond 1cm were close to the background value. Distinguished approaches can be executed to separate the surface part and dispose safely in heavy metal polluted C&DW treatment.%研究了混凝土暴露在重金属环境中的污染特征，采用Zn、Cu、Pb、Cr、Cd单一溶液及混合溶液浸泡C20混凝土试块，分析了重金属在混凝土剖面的分布规律。结果表明，重金属主要分布于混凝土表层1 cm内，>1cm深度混凝土中重金属含量接近背景含量，建议在受重金属污染的混凝土构筑物拆除无害化处理处置中，可对其进行表层剥离。