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Laboratory Performance Evaluation Of Gtr-modified Sma Mixtures With Fractionated Rap

机译:分级Rap的Gtr改性Sma混合物的实验室性能评估

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In 2006, the Illinois Tollway initiated a trial of hot mix asphalt (HMA) surface mixes modified with ground tire rubber (GTR). These mixes originally were intended to improve pavement noise, and they proved to have additional benefits for stone matrix asphalt (SMA) and open graded asphalt mixtures. In 2007, the Tollway embarked on a field trial and laboratory pavement performance validation of an SMA asphalt surface mixture that uses fractionated recycled asphalt pavement (FRAP) and GTR. This highly recycled material was evaluated during mix design, field production, and laboratory performance testing. The Tollway selected a demonstration project site on a rural interstate highway with high truck traffic, then proceeded with mix designs, field production, and strict quality testing. The mix design and field production documentation shows that GTR-modified SMA mixes with FRAP can be designed and produced with success. The use of GTR eliminates the need for the fibers that often are required using other modifiers. The laboratory evaluation of performance included such tests as dynamic modulus, beam fatigue, stability, rut testing, and tensile strength testing. The results of these tests indicate that the performance of the GTR-modified mixes is similar to other SBS modified HMA mixes commonly used in Illinois. These performance test data are the first validation of the use of GTR and FRAP in SMA mixtures under heavy interstate traffic.
机译:2006年,伊利诺伊州收费公路启动了用磨碎轮胎橡胶(GTR)改性的热拌沥青(HMA)表面混合物的试验。这些混合物最初旨在改善路面噪声,并被证明对石基质沥青(SMA)和开放级沥青混合物具有其他好处。在2007年,收费公路开始对使用分馏再生沥青路面(FRAP)和GTR的SMA沥青表面混合物进行现场试验和实验室路面性能验证。在混合物设计,现场生产和实验室性能测试期间对这种高度回收的材料进行了评估。收费公路选择了卡车通行量高的乡村州际公路上的示范项目,然后进行了混合料设计,现场生产和严格的质量测试。混合物设计和现场生产文档显示,可以成功设计和生产GTR改性SMA与FRAP混合物。使用GTR消除了对使用其他改性剂经常需要的纤维的需求。实验室对性能的评估包括动态模量,梁疲劳,稳定性,车辙测试和拉伸强度测试等测试。这些测试的结果表明,GTR改性混合物的性能类似于伊利诺伊州通常使用的其他SBS改性HMA混合物。这些性能测试数据是在州际交通繁忙的情况下在SMA混合物中使用GTR和FRAP的首次验证。

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