Evaluation of Repeated Creep and Recovery Test Method as an Alternative to SHRP+ Requirements for Polymer Modified Asphalt Binders
Evaluation of Repeated Creep and Recovery Test Method as an Alternative to SHRP+ Requirements for Polymer Modified Asphalt Binders
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发表时间：
2006-11
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通讯作者：
J. D'angelo;R. Dongre;G. Reinke
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作者：
J. D'angelo;R. Dongre;G. Reinke
SuperpaveTM性能分级（PG）沥青结合料系统现在在美国被普遍使用。有些状态还需要额外的经验测试，如弹性恢复，低温延展性，力延展性，韧性和韧性，以及其他变化。这些额外的测试，称为SHRP+规范，用于确保沥青粘合剂含有弹性体改性剂。联邦公路管理局（FHWA）一直在评估重复蠕变和恢复试验（RCRT）作为各种SHRP+试验的可能替代方案。除了表征基本特性外，RCRT还是一种易于使用的性能相关测试。RCRT在高PG温度下进行，所用时间与当前Superpave动态剪切流变仪（DSR）测试大致相同。RCRT和弹性恢复之间的测试结果的比较表明，许多粘合剂的良好的相关性。目前已有一个标准做法草案，美国各用户、生产者团体和主要州机构正在使用该草案，以验证多重应力RCRT准则。本文详细介绍了多应力RCRT，并给出了数据分析结果。建议实施本试验方法，作为SHRP+试验的可能替代品。有关本次会议的封面摘要，请参阅ITRD编号E215112。（一）
The SuperpaveTM Performance Graded (PG) asphalt binder system is now being universally used in the United States. Some states also require additional empirical tests such as elastic recovery, lowtemperature ductility, force ductility, toughness and tenacity, and other variations. These additional tests, referred to as SHRP+ specifications, are employed to ensure that asphalt binders contain elastomeric modifiers. The Federal Highway Administration (FHWA) has been evaluating the Repeated Creep and Recovery Test (RCRT) as a possible alternative to the various SHRP+ tests. In addition to characterizing fundamental properties, the RCRT is an easy to use performance related test. The RCRT is conducted at the high PG temperatures and takes approximately the same amount of time as the current Superpave Dynamic Shear Rheometer (DSR) test. Comparison of test results between the RCRT and elastic recovery has shown a good correlation for many binders. A draft standard practice is available and is being used in the United States by various user producer groups and lead state agencies to verify the multiple stress RCRT criterion. This paper describes the multiple-stress RCRT in detail and presents the results of data analysis. Recommendations are made for implementation of this test method as a possible replacement of the SHRP+ tests. For the covering abstract of this conference, see ITRD number E215112. (A)