Evaluation of Moisture Damage on Warm Mix Asphalt with Reclaimed Asphalt Pavement Material
| Autor: | Tzu-Wei Hou, 侯此威 |
|---|---|
| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 The use of reclaimed asphalt pavement (RAP) helps saving natural resources and money. More than ninety-seven percent of the roads surface in Taiwan is paved with hot-mix asphalt (HMA). Recycling of RAP is a crucial necessity to save precious nature aggregates, and reduce the use of costly asphalt binder. But the higher production temperature limits the amount of RAP. To avoid deterioration of the aged binder, RAP should not be exposed to too high temperatures. The introduction of warm-mix asphalt (WMA) technologies, however, provides the opportunity to mix and compact asphalt mixtures at a lower than conventional temperature, and hence could increase the percentage of RAP usage to save more energy and natural resources. Moisture susceptibility of mixtures, generally called stripping, is a major form of distress in asphalt concrete pavements. High temperature, humidity and massive rainfall in summer characterize the climate in Taiwan. Moisture susceptibility of recycled HMA with warm mix asphalt technologies may be a critical problem due to incompletely dried aggregates resulting from its lower mixing and compacting temperature, especially in Taiwan’s climate. This study investigated the effects of WMA additives on moisture susceptibility of recycled HMA containing RAP by using several major stripping tests. Results from our laboratory study indicated that the use of Rediset® WMX provided better performance in reducing mixing temperature and stripping resistance, compared to Sasobit® H8. No significant difference was found between moisture susceptibility with and without Sasobit® H8. The results of stripping tests showed that Rediset® WMX did have good performance in resisting moisture damage even with 70% of RAP. The use of Rediset® WMX in recycled HMA to increase RAP content at a lower mixing and compacting temperature seemed feasible based on the results of our study. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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