AN ELEVEN-YEAR EVALUATION OF ARIZONA'S PRESTRESSED PAVEMENT

Abstract

This study evaluates the performance of a post-tensioned prestressed concrete pavement (PCCP) section on the Superstition Freeway in Phoenix, Arizona, eleven years post-construction. Originally designed to address joint-related distresses common in jointed concrete pavements, the prestressed pavement concept applies continuous compressive stress to counteract flexural stresses, theoretically improving durability and smoothness. The Arizona Department of Transportation's experiment involved various secondary factors, including polyethylene sheet layers between the base and slab and varied slab lengths. Through extensive evaluation, including visual distress surveys, deflection testing, and roughness measurements, the study provides insights into the performance and durability of the prestressed pavement compared to conventional concrete pavements. Findings indicate that while prestressed pavements hold promise for enhanced performance through reduced joint-related distresses, practical challenges in construction and maintenance have impacted their overall effectiveness. The experimental section exhibited significant distress, particularly at gap slabs and joints, alongside a high degree of roughness and longitudinal cracking. These issues were compounded by extreme traffic loads far exceeding design expectations, leading to accelerated deterioration. The evaluation underscores the necessity for improved construction practices, design modifications, particularly around gap slabs and joints, and further research to harness the full potential of prestressed concrete pavements. Despite the high initial costs and maintenance challenges, the study acknowledges the potential for cost savings and performance benefits in specific applications, suggesting a continued role for prestressed pavements in future infrastructure projects. (Abstract generated by AI tool ChatGPT 4)