United States Department of Transportation
i
Concrete debris assessment for road construction activities : final report.
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2016-08-01
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[PDF-2.66 MB]
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Edition:Final report
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Abstract:Two distinct but related issues of importance to FDOT were investigated: (1) the possible impact of
recycled concrete aggregate (RCA) used as road base on the subsurface environment and (2) the
management of concrete grinding residuals (CGR) resulting from grooving and grinding operations for
Portland cement concrete pavements. Results from the literature and from testing on Florida-specific
RCA indicate that the leachate produced by the contact of water with RCA is elevated in pH. Several
factors were demonstrated to reduce leachate pH in the environment, but the extent to which this
reduction will occur depends on environmental conditions that require additional testing to evaluate.
CGR produced from concrete grinding operations is not hazardous waste, but is elevated in pH and
requires appropriate management. Best management practices should be implemented for CGR, and
examples of such practices are available. Management of CGR with concrete truck washout is a viable
option. If CGR is discharged adjacent to roadways, care must be taken to avoid impact on ecosystems.
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