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首页> 美国政府科技报告 >Development of a New Method for Assessing Asphalt Binder Durability with Field Validation
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Development of a New Method for Assessing Asphalt Binder Durability with Field Validation

机译：利用现场验证开发一种评价沥青结合料耐久性的新方法

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This project was a comprehensive study directed at developing an improved method of screening asphalt binders for long-term pavement performance. A new dynamic shear rheometer (DSR) function and a new aging procedure should warn of premature asphalt hardening and resulting fatigue cracking. For unmodified asphalts the new DSR function GN/(0N/GN) correlated well with ductility (at 15 degrees C, 1 cm/min) below 10 cm. The correlation was originally developed for DSR measurements at 15 degrees C and 0.005 rad/s. These conditions were time-temperature superposition shifted to 44.7 degrees C and 10 rad/s to produce a method that is easily accessible to standard laboratory rheological equipment and methods. The recommended aging procedure uses the pressure aging vessel (PAV) apparatus but takes advantage of the higher average aging rate when the asphalt is aged in thinner films. This change, combined with somewhat longer aging, results in a more rigorous test of durability than the standard PAV method. At the same time, the resulting rankings of aged materials are more representative of rankings that are obtained from aging at atmospheric air pressure and 60 degrees C.

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