Minnesota Department of Transportation

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Concrete Grinding Residue: Its Effect on Roadside Vegetation and Soil Properties

Status:  Complete
Report Date:  01/24/2019

Summary:

This MnDOT study determined that depositing concrete grinding residue (CGR) slurry at specific rates on roadside vegetation and soil may not cause lasting harm to plant growth and soil quality. Study results showed that CGR did not appear to hinder vegetation growth or soil quality, but did change soil chemistry. At some roadside areas, the increase in soil pH enhanced plant growth. Results cannot be generalized for all soil types, plant communities, concrete residues or water sources in Minnesota. Access to real-time slurry disposal activity is needed for a thorough investigation.

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