Title: CEMENTITIOUS REACTIVITY OF MUNICIPAL SOLID WASTE INCINERATION FLY ASH AND IMMOBILIZATION EFFECT BY CEMENT
Abstract: Municipal Solid Waste Incineration(MSWI) fly ash is from scrubber after incineration of municipal solid wastes, its main composition is CaO, SiO2 , Al2O3 , and Fe2O3 , similar to the blastfurnace slag and the fly ash produced by burning pul-verized coal in power stations. MSWI fly ash contains some heavy metals, which can be leached by water, so it is regarded as hazardous matter, and must be solidified/stabilized. The mechanical properties and hydration mechanism of the hardened ce-ment paste containing MSWI fly ash were studied. The effect of immobilization of cement on MSWI fly ash was investigated. And the feasibility of MSWI fly ash as auxiliary cementitious materials was indicated. The results show that the reactivity of MSWI fly ash is lower and its addition to cement causes retardation of cement hydration, the formation of ettringite during the hydration process is beneficial to enhancement the strength, but a large amount of addition of MSWI fly ash will cause the de-crease of the strength of the hardened cement paste. It is efficient to use cement for immobilization MSWI fly ash. The heavy metals can be immobilized in the structure of the hydration phases by holding, substitution or sorption.
Publication Year: 2003
Publication Date: 2003-01-01
Language: en
Type: article
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Cited By Count: 11
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