Cost-effectiveness and performance of overlay systems in Illinois, volume 1 : effectiveness assessment of HMA overlay interlayer systems used to retard reflective cracking.
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2009-05-01
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Edition:Project report, 2005-2008
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Abstract:This project evaluated the ability of interlayer systems used in HMA overlays to retard reflective cracking. Field
crack surveys and forensic investigation, including video imaging and ground penetrating radar surveys as well
as laboratory testing of cored specimens, were conducted to examine the behavior of reflective cracking and
reflective cracking control systems applied in Illinois. Crack extent and severity were recorded at 24 locations
across Illinois. The performance evaluation focused on five types of interlayer systems: area- and strip-type nonwoven
fabric; two strip-type composite; and a fine, high polymer content HMA interlayer system. Two reflective
cracking indices were developed to characterize the condition of HMA overlays regarding reflective cracking as
well as transverse cracking. In addition, a performance benefit ratio parameter, PBR, was developed to assess
the performance of treated pavements relative to control sections. The study provided a quantitative assessment
for various types of reflective cracking interlayer systems. In addition, it provides a means to predict the
performance of several interlayer systems under various vehicular and environmental loading conditions through
a simple ESALs-TL chart. A companion report (volume 2) provides tools for the selection of appropriate reflective
crack control treatments based upon traffic, climate, and life cycle costs using a user-friendly life cycle cost
analysis program (CIND – Cost-effective INnterlayer system Decision program).
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