摘要: |
The Superpave mix design procedure improved mixture quality; however, it still remains a volumetric design devoid of performance tests. A mixture produced for high traffic volumes (above 10 million ESALs), results in low design asphalt content due to the increased gyrations. The lower binder content, although enhancing the rutting performance, might increase the cracking susceptibility of the mix. Modified asphalt have gotten a lot of attention during the past few years due to the promise of enhanced mixture performance. This study consolidated work done in Florida with polymer-modified asphalts-mainly Ground Tire Rubber (GTR) and styrene butadiene styrene. Issues with the use of modifiers as well as their relative performance have been examined and summarized. Information reviewed included data from the Heavy Vehicle Simulator, laboratory experiments-Asphalt Pavement Analyzer, Servopac, and Indirect Tension Test-as well as field results. |