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PERFORMANCE OF RUBBERIZED ASPHALT PAVEMENTS IN ILLINOIS
| 题名： | PERFORMANCE OF RUBBERIZED ASPHALT PAVEMENTS IN ILLINOIS |
| 作者： | Tessa H. Voile |
| 关键词： | crumb rubber modifier (CRM), rubberized asphalt, wet process, dry process, performance, distress surveys, friction. International Roughness Index (IRI), rut values |
| 摘要： | In 1991, the Illinois Department of Transportation began a program to incorporate scrap tire rubber as a modifier in selected hot-mix asphalt (HMA) paving projects. This effort was a response to the requirements of the Intermodal Surface Transportation Efficiency Act (ISTEA) of 1991. In 1995, when the department ended its efforts In crumb rubber modifier (CRM) usage, eleven crumb rubber projects had been constructed. By that time. Section 1038 of ISTEA was modified by subsequent federal legislation and the mandate was repealed. Two methods were used in Illinois to combine CRM with HMA: the wet process and the dry process. Two terms have been used in Illinois to define the various quantities of CRM added to HMA: variable rate and fixed rate. Variable rate defines a small quantity of CRM added to the HMA: no more than five pounds of CRM per ton of HMA. Fixed rate defines a larger quantity: no less than twenty pounds of CRM per ton of HMA. This report includes a cost summary In which .he final bid prices of HMA containing CRM for each project are compared to costs of conventional HMA in Illinois. However, the main purpose of this report is to summarize the performance monitoring of the eleven crumb rubber modified HMA projects in Illinois through March 31,1999. Performance monitoring of most of the rubberized asphalt pavements Includes the following: visual distress surveys and surface property characteristics. |
| 报告类型： | 科技报告 |
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