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Paper 1: This study covers a condition survey in Indiana of 328.5 mi. of rigid pavements constructed with granular bases. Paper 2: All new concrete pavement in Illinois has been placed on granular subbase where the natural soil is fine-grained and heavy truck traffic is expected. The lower cost of constructing the trenched undrained subbase was a deciding factor in the preference shown for this type of subbase.
In report 1 the location, design, materials, construction, traffic, and early performance are described of an experimental concrete pavement built in Indiana to study the effectiveness of subbases in the control of pumping. The second report tells of a project which was built in the summer and fall of 1952 in an attempt to determine the performance of various thicknesses of subbase on a main truck route.