Validation of SHRP Performance Graded Binder Specifications Using Field Simulation Testing Equipmentby Gayle N. King, Koch Materials Co,
Helen W. King, Koch Materials Co,
Abstract: The Strategic Highway Research Program (SHRP) was initiated to improve the effectiveness of laboratory test methods in predicting field performance. European highway agencies are using sophisticated laboratory testing equipment, such as rutting testers, designed to mimic pavement failure conditions as closely as possible. Characterizing binder performance has become complicated with the increasing use of modified asphalts to address binder-related pavement failures. Modifiers, especially polymers, are being used to increase the temperature range over which an asphalt resists both rutting and thermal cracking, as well as fatigue failure by improving viscoelastic properties. While conventional test methods such as penetration and viscosity may have adequately compared asphalts in the past, they are not accurate in predicting relative performances of modified materials. In this study, test results from the SHRP binder procedures are compared to test results from the European LCPC (French Government Highway Laboratory) rut tester, the German wheel tracking device (Helmut-Wind) and the Thermal Restrained Specimen Tensile Test (TRSTT) developed by Professor Arand in Germany. The methods are then used to evaluate the West Coast User-Producer PBA specification, which was also intended to be performance based.
Subject Headings: Laboratory tests | Pavement rutting | Highways and roads | Failure analysis | Asphalt pavements | Material failures | Field tests | Equipment and machinery
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