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Effect of Warm Mix Asphalt (WMA) Low Mixing and Compaction Temperatures on Recycled Asphalt Pavement (RAP) Binder Replacement.
| 题名： | Effect of Warm Mix Asphalt (WMA) Low Mixing and Compaction Temperatures on Recycled Asphalt Pavement (RAP) Binder Replacement. |
| 作者： | Faheem, A.; Abboud, B.; Coe, J.; Alsalihi, M. |
| 关键词： | Warm mix asphalt(WMA), Reclaimed asphalt pavement (RAP), Construction densification index, Traffic densification index, Semi-circular bend (SCB), Evotherm |
| 摘要： | The use of Warm Mix Asphalt (WMA) technologies in asphalt concrete production allows for economic and environmental benefits. Incorporating high Reclaimed Asphalt Pavement (RAP) contents in mixes at WMA temperatures poses a challenge in the ability to attain the quality of produced pavements. It is unknown if WMA production conditions influence the full integration of RAP in the mixes, thus its overall performance. This study examines the effect of six factors including mixing/compaction temperatures, RAP content and source, WMA type, binder grade, and conditioning duration on mixture compaction, and cracking resistance. The results show that at 15% RAP WMA mixes can meet volumetric limits at the warm production temperature level. However, at 30% RAP, hot production temperature is required to achieve the same level of compaction. Binder grade, conditioning duration, and WMA additive types considered in this study showed minimal influence on the compaction results. Cracking resistance of the mixes is shown to be overwhelmingly influenced by the RAP content. The study results show that meeting the mix design volumetric requirements did not necessary translate into improved cracking performance. The interaction between the WMA and higher RAP level (30%) is complex as it is dependent on RAP source, production temperature, and binder grade. |
| 报告类型： | 科技报告 |
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