Portland cement gives concrete support to solidification/stabilization technology
- Portland Cement Association, Skokie, IL (United States). Public Works Dept.
One waste-treatment method that advanced in the wake of the Resource Conservation and Recovery Act`s land-disposal restrictions--cement-based solidification and stabilization technology--rests on a concrete premise. Calcium hydroxide and calcium silicate hydrate formed during hydration of portland cement have chemical and physical properties that can safely stabilize hazardous compounds and solidify the varied waste forms in which they occur. Due to the complexity of waste streams, cement-based solidification-stabilization offers no single recipe for all wastes and conditions, and its precise chemical reactions have yet to be determined. However, reports from the federal government, waste generators and treaters underscore the utility of portland cement as a reagent for stabilizing and solidifying waste. Like most solidification systems, cement-based treatment economically eliminates free liquids, reduces hazardous constituent mobility by lowering waste permeability, minimizes constituent leachability, and provides physical stability for handling, transport and disposal. Inorganic wastes amenable to cement-based stabilization include: arsenic, barium, cadmium, chromium, lead, mercury, selenium, silver, copper, nickel, and zinc.
- OSTI ID:
- 46029
- Journal Information:
- Environmental Solutions, Journal Name: Environmental Solutions Journal Issue: 5 Vol. 8; ISSN ESOLE7; ISSN 1077-2537
- Country of Publication:
- United States
- Language:
- English
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