Characterization of mercury- and zinc-doped alkali-activated slag matrix: Part I. Mercury |
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Authors: | Guangren Qian Darren Delai Sun |
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Affiliation: | a School of Environment Engineering, Shanghai University, No. 149, Yanchang Road, 200072 Shanghai, PR China b Environmental and Engineering Research Center, School of Civil and Environment Engineering, Nanyang Technological University, Singapore, Singapore |
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Abstract: | The physical properties, pore structure, hydration process and hydration products of mercury-doped (Hg-doped) alkali-activated slag (AAS) matrixes have been evaluated by examination of physical properties, pore structure analysis and XRD, TG-DTG, FTIR and TCLP methods. Low concentrations of Hg2+ ions had little effect on the compressive strength, pore structure and degree of hydration of AAS matrixes. The addition of 2% Hg2+ ions into the AAS matrix brought out an evident retardation on early hydration and reduction of early compressive strength, but no negative effects were noticed after hydration for 28 days. The results also show that up to 2% of Hg2+ ions can be effectively immobilized in the AAS matrix, with the leaching meeting the TCLP mercury limit. Two mechanisms, physical encapsulation and chemical fixation, are assumed to be responsible for the immobilization of mercury in the AAS matrix. |
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Keywords: | Mercury Immobilization Alkali-activated slag matrix Hydration products and physical properties |
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