DEVELOPMENT OF LOAD TRANSFER COEFFICIENTS FOR USE WITH THE AASHTO GUIDE BASED ON FIELD MEASUREMENTS

Abstract

This study aims to refine the load transfer coefficients employed in the design of rigid pavements, particularly continuously reinforced concrete pavements (CRCP), within the AASHTO Guide framework. Initiated due to the limitations in scope of the AASHO Road Test, which underpins current AASHTO pavement design guidelines, this research seeks to incorporate broader conditions reflective of varied pavement structures encountered in Texas. Through extensive field measurements and analysis, new load transfer coefficients were developed to better predict CRCP performance, factoring in variables such as slab configurations, joint types, and environmental conditions not previously accounted for. The methodology involved assessing in-service pavements for load transfer efficiency using the falling weight deflectometer (FWD) data, followed by statistical analysis to establish more accurate and regionally tailored coefficients. Findings indicate a notable deviation from the traditional AASHTO Guide recommendations, advocating for revised coefficients that cater to local materials, climatic variations, and traffic conditions. This adaptation promises to enhance pavement longevity and performance, ensuring more cost-effective and reliable pavement structures. The study’s outcomes are poised to influence future revisions of the AASHTO Guide, aligning pavement design practices with the evolving demands of infrastructure development and maintenance. (Abstract generated by AI tool ChatGPT 4)