Subgrade Support Characteristics: Technical Paper

In 1949 the State Highway Department of Indiana and the Bureau of Public Roads constructed an experimental road for the purpose of investigating means of pavement pumping on highway that carry a high traffic volume with normal distribution of heavy axle loads. This project is located n the Northwest corner of Indiana on a section of US Road No. 41. The test road is entirely within the Valparaiso morainic area and the underlain by mixtures of silt and clay deposited during the Wisconsin glacial stage. Each mile of the project has nine subbase sections. In order to determine the differences in performance of the concrete pavements on the various subbase treatments many types of observations have been made. Among these are pavement roughness, differential levels, visual inspections and moisture cell readings.