Guidance for improving foundation layers to increase pavement performance on local roads.
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2014-11-01
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Abstract:This document is the second of two deliverables for the project Optimizing Pavement Base, Subbase, and Subgrade Layers
for Cost and Performance on Local Roads (TR-640). The first deliverable is the 454-page Final Field Data Report. The field
data report describes test results and comparative analysis from 16 different portland cement concrete (PCC) pavement sites
on local city and county roads in Iowa. At each site the surface conditions of the pavement (i.e., crack survey) and
foundation layer strength, stiffness, and hydraulic conductivity properties were documented. The field test results were
used to calculate in situ parameters used in pavement design methodologies for AASHTO (1993) and Iowa’s Statewide
Urban Design and Specifications (SUDAS). Overall, the results of the study demonstrate how in situ and lab testing can be
used to assess the support conditions and design values for pavement foundation layers and how the measurements
compare to the assumed design values. This guide summarizes the study results and outlines general guidelines for
applying them to optimize pavement bases, subbases, and subgrade layers of local roads with PCC pavements and thus
their performance.
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