The leachability of heavy metals in hardened fly ash cement and cement-solidified fly ash

被引：84
作者：
Yu, QJ [1 ]
Nagataki, S
Lin, JM
Saeki, T
Hisada, M
机构：
[1] S China Univ Technol, Coll Mat Sci & Engn, Guangzhou 510640, Peoples R China
[2] Aichi Inst Technol, Ind Technol Res Inst, Toyota 4700392, Japan
[3] Niigata Univ, Dept Civil Engn & Architecture, Niigata 9502181, Japan
[4] Publ Works Res Inst, Tsukuba, Ibaraki 3058516, Japan
来源：
CEMENT AND CONCRETE RESEARCH | 2005年 / 35卷 / 06期
基金：
日本学术振兴会; 中国国家自然科学基金;
关键词：
toxic metal; leaching; heavy metals; cement; fly ash;
D O I：
10.1016/j.cemconres.2004.03.031
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The effect of mix proportion, leachant pH, curing age, carbonation and specimen making method etc. on the leaching of heavy metals and Cr(VI) in fly ash cement mortars and cement-solidified fly ashes has been investigated. In addition, a method for reducing the leaching of Cr(VI) from cement-solidified fly ashes is proposed. The results mainly indicate that: (1) either Portland cement or fly ash contains a certain amount of heavy and toxic metals, and the leaching of them from hardened fly ash incorporated specimens exists and is increased with fly ash addition and water to cement ratio; (2) the leachability of some heavy metals is greatly dependent on leachant pH; (3) when carbonation of cement mortars occurs the leaching of chromium ions is increased; (4) the amount of heavy metals leached from cement-solidified fly ashes depends more on the kind of fly ash than their contents in fly ash; and (5) with ground granulated blast furnace slag addition, the leaching of Cr(VI) from solidified fly ashes is decreased. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1056 / 1063
页数：8
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