Permeability of the Special Base Used on US 63 La Plata, Missouri

Koch Industries specified an aggregate base special for the expansion of US 63 in Macon and Adair counties of Missouri. The base deviates from Missouri Department of Transportation's (MoDOT’s) standards, raising concern about its performance. The Institute for Interdisciplinary Geotechnics was contracted, specifically to evaluate the in situ permeability of the base. In situ permeability tests, laboratory gradation analyses, laboratory permeability and aging tests were performed on the base to quantify its permeability characteristics.