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Evaluation of Crumb Rubber in Hot Mix Asphalt.
| 题名： | Evaluation of Crumb Rubber in Hot Mix Asphalt. |
| 作者： | bennert, t. maher, a. smith, j. |
| 关键词： | *Hot-mix-paving-mixtures; *Asphalt-pavements; *Rubber-.;Dynamic-modulus; Evaluation-; Binders-Materials; Tire-recycling; Aggregrates-; Viscosity-; Road-materials; Performance-tests. |
| 摘要： | An asphalt-rubber hot mix asphalt (AR-HMA) design was created using a Superpave 12.5mm gradation and a no. 30 (-) mesh crumb rubber at 20%total weight of the asphalt binder. At this point in time, asphalt rubber has only been used with HMA that contains a more open graded nature, such as open graded friction course (OGFC). However, OGFC is limited on it use due to its potential problems (i.e. clogging and winter maintenance). However, a 12.5mm Superpave mix may be used on almost any roadway in New Jersey and is most commonly found as the surface course. It is used for both new construction and rehabilitation projects. Therefore, this mix type has the largest potential for usage, meaning that more tires can eventually be recycled. However, two factors need to be considered prior to acceptance; performance and cost. Four HMA mixes were constructed and tested in this study. Three baseline mixes using a PG64-22, PG70-22, and a PG76-22 asphalt binder, as well as the AR-HMA mix which used crumb rubber blended with the same PG64-22 asphalt binder. The influence of crumb rubber particle size on the compaction properties during the mixture design procedure was also evaluated. |
| 报告类型： | 科技报告 |
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