原文传递
Development of a Suitable Procedure for Simulating Aging Effects of Hot-
Mixing on Modified Asphalts for Use in Superpave Binder Specifications
| 题名： | Development of a Suitable Procedure for Simulating Aging Effects of Hot- Mixing on Modified Asphalts for Use in Superpave Binder Specifications |
| 作者： | Mang Tia, Okan Sirin & Chuang-Tsair Shih |
| 关键词： | Superpave binder specification, rotavapor, Morton flask, RTFOT, PAV, TFOT, crumb rubber- modified asphalt. Reflux asphalt extraction |
| 摘要： | Prior studies have shown that asphalts modified with coarse crumb rubber and SBR tended to spill out from the bottles during the Rolling Thin Film Oven Test (RTFOT) process. When the standard Thin Film Oven Test (TFOT) was used, a thin skin tended to form on the surface of some modified asphalt samples, which reduced the homogeneity and the aging of the samples. In this study, the rotavapor apparatus, which was originally used for recovery of asphalt from solution (ASTM D5404), was modified to work as an aging device for asphalt, and evaluated for its suitability as a replacement for the standard RTFOT procedure for simulation of short-term aging of both pure asphalts and modified asphalts. The modified rotavapor aging procedure was found to be a versatile and effective method for aging of pure asphalts and modified asphalts. It has advantages over the standard RTFOT and TFOT procedures in that (1) there was no spillage and skin formation problem, (2) a large sample size can be used, and (3) different levels of aging of the asphalt samples can be achieved. It is recommended that the possible implementation of this aging method for simulation of short-term aging in place of the RTFOT process and long-term aging in place of the RTFOT + PAV process be pursued. This study also resulted in some better understanding of the asphalt extraction process. It was found that the extracted aggregate from the Reflux extraction tended to absorb moisture from the air after it was taken out of the drying oven to cool to room temperature before weighing. This could cause a substantial error in the computation of asphalt content. The problem was solved when the extracted aggregate was left to cool in a desiccator before weighing |
| 报告类型： | 科技报告 |
相关文献
- EVALUATION OF STABILITY, NATURE OF MODIFIER, AND SHORT-TERM AGING OF MODIFIED BINDERS USING NEW TESTS: LAST, PAT, AND MODIFIED RTFOT.
- DEVELOPMENT OF A MODIFIED ROTAVAPOR APPARATUS AND METHOD FOR SHORT-TERM AGING OF MODIFIED ASPHALTS.
- EVALUATION OF LABORATORY METHODS SIMULATING AGING EFFECTS OF ASPHALT BINDER.
- APPLICABILITY OF SUPERPAVE BINDER TESTING PROTOCOLS TO MODIFIED BINDERS.
- EVALUATION OF PHYSICAL PROPERTIES OF FINE CRUMB RUBBER-MODIFIED ASPHALT BINDERS.
- DEVELOPMENT OF A STIRRED AIRFLOW TEST PROCEDURE FOR SHORT-TERM AGING OF ASPHALTIC MATERIALS.
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