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Development of Laboratory Mix Design Procedures for RAP Mixes.
| 题名： | Development of Laboratory Mix Design Procedures for RAP Mixes. |
| 作者： | Cooley, L. A.; Williams, K. |
| 关键词： | Aggregates; Asphalt Concretes; Asphalt Pavements; Design; Durability; Evaluation; Film Thickness; Hot Mix Paving Mixtures; Recycled Asphalt; Road Materials; Superpave; Voids |
| 摘要： | The objective of this study was to evaluate the amount of blending that occurs between RAP and virgin asphalt binders in plant produced HMA in which RAP is incorporated. This objective was accomplished by testing plant produced mixture from three different on-going HMA projects. Two of the three projects incorporated 15 percent RAP while the third project incorporated 30 percent. Samples were brought back to the laboratory and subjected to a staged extraction/recovery process. Asphalt binder recovered from each stage was subjected to Dynamic Shear Rheometer testing in order to determine the high failure temperature using a criterion of 2.20 kPa. Based upon the research approach, it was concluded that majority of asphalt binder was extracted and recovered from the first stage of washing. The amount of asphalt binder extracted/recovered from successive washes decreased, except for the last stage. For mixes containing 15 percent RAP, the asphalt binder was not significantly affected by the RAP though there was a slight increase in failure temperature through the staged washes, except for the last stage. The majority of the asphalt binder from the 30 percent RAP mixture was removed during the first stage of washing. The stiffness of the asphalt binder after Wash 1 was higher for this 30 percent RAP mix than for the 15 percent RAP mix; however, the increase in stiffness was not large. The increase in stiffness for successive washes was higher for the 30 percent RAP mix than for the 15 percent RAP mixes. Based upon these findings, it was concluded that partial blending between RAP and virgin asphalt binders when RAP is incorporated into plant produced HMA |
| 报告类型： | 科技报告 |
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