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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: The Stabalization of Aqueous Heavy Metal Species Using Recycled Concrete Fines
Author(s): N. J. Coleman, D. C. Johnson, 0.1. Shtepenko, and
C. D. Hills
Publication: Special Publication
Appears on pages(s): 207-224
Keywords: crushed concrete fines; demolition waste; heavy metal
stabilization; leaching; recycling; sorbent
Abstract:The crushing of reclaimed concrete-based demolition waste in the production of recycled aggregate produces a large volume of fine material which is rich in hydrated cement paste phases, the coarser fraction being predominantly composed of aggregate. It is the coarse fraction which is of use in construction and the fine fraction which is destined for landfill. Heavy metal-bearing wastewater and sludge arise from a number of industrial processes including; electroplating, galvanising, metal finishing and battery production. Treatment procedures for aqueous heavy metal-contaminated waste streams include; precipitation, adsorption, ion exchange, membrane filtration and soliditication/stabilisation using cement or lime-based materials. The removal of heavy metal species from aqueous media by the cement-rich fraction of ordinary portland cement-based waste concrete is demonstrated herein. Crushed concrete waste in the particle size range 1 - 2 mm is shown to be effective in the exclusion of a range of heavy metal nitrates (Pb2’, Cr3+, Cu’+, NiZf and Zn*‘) from solution. The leaching characteristics of the metal-impregnated cement matrices are also reported.
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