期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 188, 期 -, 页码 860-873出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2018.08.182
关键词
Alkali-activation; Blast furnace ferronickel slag; Reaction products; Autogenous shrinkage; Heavy metals leaching
资金
- National Natural Science Foundation of China [51778334]
- State Key Joint Laboratory of Environment Simulation and Pollution Control [16K06ESPCT]
Blast furnace ferronickel slag (BFFS) is a kind of heavy metal-bearing slag with moderate calcium content that is obtained from the production of ferronickel in a blast furnace. The reaction mechanism, engineering properties, and leaching behaviors of alkali-activated BFFS materials were investigated. The results show that the main crystalline phase of the reaction products is stratlingite, and the gel phase is a kind of C-A-S-H with Ca/Si and Al/Si ratios of 0.64-1.65 and 0.57-1.44, respectively. The reaction of BFFS greatly depends on the alkalinity and silicon modulus, with a high alkalinity and low silicon modulus resulting in a rapid initial exothermic rate, a high reaction degree, and a denser pore structure in the alkali-activated BFFS materials. In addition, the compressive strength of the alkali-activated BFFS mortar is comparable to that of the alkali-activated blast furnace slag (BE); furthermore, the alkali-activated BFFS shows more continuous strength gains from 7 days to 90 days and much lower 7-day autogenous shrinkage. More importantly, the alkali-activation treatment can significantly decrease the leaching amount of Mn, Cr(VI) and Cr(III), and it converts the hazardous BFFS to non-toxic construction materials. (C) 2018 Elsevier Ltd. All rights reserved.
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