United States Department of Transportation
i
Evaluation of waste concrete road materials for use in oyster aquaculture – phase 3 : research summary.
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2016-08-01
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Abstract:The use of recycled materials has gained increased attention for the environmental benefits, and the reuse of industrial by-products and waste materials can provide a stream of revenue for producers and a durable, cost-effective material option for end users. Recycled concrete aggregate (RCA) is one of the recycled materials that the Maryland Department of Transportation, State Highway Administrative (SHA) is exploring its alternative uses. For example, using RCto condition portions of the Chesapeake Bay bottom to support spat-on-shell aquaculture projects. The RCA is created by crushing and milling old concrete pavement or other structure elements. For RCA to be used within the aquatic setting of the Chesapeake Bay, its chemical behavior under saturated conditions must be evaluated to avoid potential adverse impacts to the aquatic ecosystem. The major concern was that accidental spills onto the road surface from vehicles could contaminate the pavement and structure elements.
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