Dynamic load responses of perpetual pavement test roads on U.S. 23: Full-scale instrumentation and evaluation. (9th May 2022)

• Record Type: Journal Article
• Authors: Zhu, Junqing; Sargand, Shad; Khoury, Issam; Tarawneh, Derar; Ma, Tao; Chen, Feng
• Is Part Of: Construction & building materials. Volume 331(2022)
• Publication Date: 2022-05-09
• Subjects: Perpetual pavement -- Dynamic load response -- Instrumentation -- Test road -- Fatigue endurance limit -- Strain gage; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2022.127326
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Comprehensive instrumentation of perpetual pavement test roads is presented. A uniquely designed strain gages rosette was installed to obtain vertical stress and was found to be effective. Good agreement was found between measured and computed strain responses. Abstract: Perpetual pavement experimental roads of varying asphalt concrete thicknesses (28 cm, 33 cm & 38 cm) were constructed and instrumented on U.S. Route 23 in Delaware County, Ohio. Controlled Vehicle Load (CVL) testing was performed to obtain dynamic load responses under vehicular load and to evaluate influence of vehicle speed, tire pressure and axle configuration. CVL tests were conducted in November 2012 and July 2013 to evaluate temperature effects on pavement responses. A linear elastic finite element model program, OpenPave was used to obtain layered elastic solutions of load responses with time history to validate measured results. Paired t-tests were performed to compare mean difference between measured and calculated strain responses. Factorial ANOVA test was performed to evaluate significance of truck speed and tire pressure on measured strain responses. It was found that the calculated strain responses were overall in good agreement with the measure values. A uniquely designed strain gage rosette was installed to obtain vertical strain in the pavement and was found to be effective. However, significant differences existed between measured and calculated strain responses in summer test due to unaccountability of the FE program for viscoelasticity of asphalt concrete materials. 33 cm section with stabilized subgrade performed the best with lowest strain responses. Tandem axle truck produced strains lower than single axle truck even though total weight was heavier. Transverse strain tends to increase as lateral wheel offset increases.