United States Department of Transportation
i
Evaluation of Joint and Crack Load Transfer Final Report
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2003-05-01
[PDF-1.19 MB]
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Abstract:This report documents an evaluation of load transfer efficiency (LTE) of cracks and joints for rigid pavements included in the Long-Term Pavement Performance (LTPP) program. LTE is an important parameter affecting pavement performance. This study presents the first systematic analysis of the deflection data collected under the LTPP program related to LTE. Representative LTE indexes and joint stiffnesses were calculated for all General Pavement Studies (GPS), Special Pavement Studies (SPS), and Seasonal Monitoring Program (SMP) rigid test sections. Data tables that include computed parameters were developed for inclusion in the LTPP Information Management System (IMS). Trend analysis was performed to evaluate the effect of design features and site conditions on LTE. Key findings from this study:
1. Large amounts of high quality LTE data have been collected under the LTPP program. This data will be a valuable resource in improving understanding of load transfer effect and improving pavement design and rehabilitation procedures.
2. LTE is a complex parameter, which depends on many factors, including falling weight deflectometer (FWD) load plate position, testing time (FWD LTE testing must be conducted in the early morning in cool weather to provide realistic estimation of LTE), season.
3. LTE of CRCP cracks was found to be higher than LTE of joint in JCP pavements.
4. LTE of doweled joints was found to be higher than LTE of nondoweled joints.
5. Nondoweled sections with a high level of LTE are less likely to develop significant faulting than sections with low LTE.
6. LTE from leave and approach side deflection testing data was found to be statistically different for a large number of JCP sections.
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