The primary objective of this research was to quantify the improvement inservice life of a flexible pavement constructed using full-depth reclamation (FDR) in conjunction with cement stabilization when specified reductions in the spatial variability of specific construction-related parameters are achieved. This study analyzed pavement data obtained through field and laboratory testing of a reconstruction project in northern Utah. Data analyses included multivariate regression, Monte Carlo simulation, and mechanistic-empirical analyses of a model pavement structure. The results of the research show a steadily increasing trend in 28-day unconfined compressive strength with increasing reductions in variability for cement content, moisture content, and RAP content across each of five different reliability levels. The most significant increases in pavement strength occurred with reductions in the standard deviations of moisture content and RAP content. Decreasing the variability of cement content did not provide significant additional strength to the cement-treated base (CTB) layer. Therefore, when involved on FDR projects, members of the pavement industry shouldfocus energy on reducing the variability of both moisture content and RAPcontent, which both significantly impact pavement life, to achieve high-quality, long-lasting pavements.
Samenvatting