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首页> 美国政府科技报告 >PPRC11 SPE 4.41.2: Laboratory and Accelerated Pavement Testing (APT) of Gap-Graded Rubberized Mixes (Hot Mix Asphalt and Warm Mix Asphalt) for the Department of Resource Recycling and Recovery (CalRecycle). Subtitle: Warm-Mix Asphalt Study - Evaluation of Hot and Warm Mix Asphalt with Respect to Binder Aging.
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PPRC11 SPE 4.41.2: Laboratory and Accelerated Pavement Testing (APT) of Gap-Graded Rubberized Mixes (Hot Mix Asphalt and Warm Mix Asphalt) for the Department of Resource Recycling and Recovery (CalRecycle). Subtitle: Warm-Mix Asphalt Study - Evaluation of Hot and Warm Mix Asphalt with Respect to Binder Aging.

机译：ppRC11 spE 4.41.2：用于资源回收和再生（CalRecycle）部门的间隙级橡胶混合物（热拌沥青和温拌沥青）的实验室和加速路面测试（apT）。副标题：暖拌沥青研究 - 热粘土和温拌沥青在粘结剂老化方面的评价。

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Warm-mix asphalt (WMA) technologies are added to asphalt binders to lower production and construction temperatures, reduce emissions, allow for increase haul distances, and improve the workability. Reduced temperatures at the plant and during laydown and compaction are hypothesized to impact long-term oxidative aging behavior. This study attempted to quantify these impacts through characterization of field-aged unmodified and rubber-modified binders extracted and recovered from cores sampled from 13 test sections representing seven different WMA technologies and associated hot-mix controls. A dynamic shear rheometer (DSR) was used to evaluate the binder rheological properties at high temperatures with respect to expected rutting performance. The cup-and-bob DSR testing procedure was assessed as an alternative approach for testing rubberized binders. A bending beam rheometer (BBR) was used to characterize low-temperature properties. Test results did not appear to be influenced by the warm-mix technology chemistry. However, the organic wax additive consistently showed better rutting resistance across all tests, and this was attributed to the residual crystallization wax structure in the binder. All test results appeared to be influenced by production and placement temperatures, indicating that some mixes produced at very low temperatures could be more susceptible to early rutting on pavements experiencing high ambient temperatures and high traffic loading. Air-void content appeared to have very little effect on the rheological properties of the extracted binder over the aging period assessed, which was not expected. The results indicated that zero shear viscosity (ZSV) is a good indicator of the rheological behavior of asphalt binders with respect to rutting performance, as observed from accelerated load testing.

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