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The leachability of heavy metals in hardened fly ash cement and cement-solidified fly ash |
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| Authors: | Qijun Yu S. Nagataki T. Saeki |
| Affiliation: | a College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, PR China b Research Institute for Industrial Technology, Aichi Institute of Technology, Toyota-shi 470-0392, Japan c Department of Civil Engineering and Architecture, Niigata University, Niigata 950-2181, Japan d Public Works Research Institute, Minamihara, Tsukuba-shi 305-8516, Japan |
| Abstract: | 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. |
| Keywords: | Toxic metal Leaching Heavy metals Cement Fly ash |
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