United States Department of Transportation
i
Phase II evaluation of waste concrete road materials for use in oyster aquaculture - field test.
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2015-02-01
[PDF-391.92 KB]
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Abstract:The overall objective of this study was to determine the suitability of recycled concrete aggregate
(RCA) from road projects as bottom conditioning material for on-bottom oyster aquaculture in the
Chesapeake Bay. During this Phase of the study, the research team placed RCA on test plots in the
Chesapeake Bay to evaluate the impact on the benthic community. Miniature oyster reefs were also
built to determine potential impacts or disruptions of RCA on the use of traditional harvesting gear.
The results of this project showed that 1.) There was no significant difference between substrate
type (RCA, oyster shell) on benthic community structure, oyster recruitment, and the abundance and
size distribution of key faunal species, demonstrating that RCA, as an alternative material, was
generally similar to natural oyster shell with regard to ecosystem services provided, and 2.) RCA
makes a suitable substrate for supporting oysters for aquaculture operations but would require a
veneer of old shell to be placed on top so as not to introduce additional weight to the catch when
using shaft tongs.
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