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

Project Details
STATE

MN

SOURCE

RIP

START DATE

06/14/16

END DATE

02/28/18

RESEARCHERS

Iowa State University

SPONSORS

MN DOT

KEYWORDS

Backslopes; Diamond grinding; Environmental impacts; Foreslopes; Roadside flora; Vegetation control

Project description

Diamond grinding of Portland Cement Concrete (PCC) highway surfaces, a maintenance operation carried out to extend the pavement service life, generates a high-pH and high alkalinity slurry (water, concrete and aggregate residue), referred to as Concrete Grinding Residue (CGR). The objective of the proposed research is to gain a stronger understanding of the CGR effects on soil, water infiltration, and vegetation through an in-situ, statistically rigorous study that will analyze inslope and/or backslope soil samples and assess soil and vegetation properties before and after placement of the CGR. Based on the study findings, Minnesota Department of Transportation's (MnDOT's) Office of Environmental Stewardship will: l) be able to better assess the need for soil amendments, either prior to or after CGR placement; 2) be in a better position to recommend possible changes to CGR slurry offloading or placement practices; and 3) be able to better assess the need for possible changes to inslope/backslope seed mixes.
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