Optimization of Geometry and Material Properties in Jointed Plain Concrete Pavement (JPCP)

Abstract

This study evaluates the influence of slab geometry and subbase type on the fatigue performance of jointed concrete pavements, using allowable load repetitions as the primary performance indicator. Four design scenarios featuring different slab widths, lengths, and subbase materials were analyzed using EverFE finite element modeling and the PCA fatigue criteria. The results demonstrate that pavements with a stabilized crushed stone subbase consistently achieve higher allowable repetitions compared to those with a lean concrete subbase. Furthermore, configurations with three slabs outperform two-slab setups regarding fatigue resistance. Optimal performance within each scenario is associated with a low length-to-thickness ratio, which in this study was limited to a minimum value of 25, and a length-to-width ratio close to 1.14. The highest fatigue performance overall was observed for a length-to-width ratio of 1.24 combined with the lowest length-to-thickness ratio tested. These findings highlight the significant impact of slab configuration and subbase selection on pavement fatigue life, providing valuable guidance for early-stage pavement design to enhance durability.