Concrete Grinding Slurry Effects on Soil pH, Cation Content and Electrical Conductivity.

Concrete grinding residue (CGR) is the byproduct slurry of diamond grinding and has high pH, calcium, potassium, magnesium, and sodium concentrations. Determining the amount of CGR which can be safely applied to roadside will allow discharging the removed material slurry from concrete diamond grinding operations onto adjacent roadside to reduce the cost of the operation. This research evaluated the effect of one-time application of different CGR rates (0, 20, 30, 40 t/acre) to roadside soil properties, existing vegetation, and runoff water quality. Results of soil pH, EC, and soil cations after CGR application will be presented.