在全尺度加速测试下,对具有常规和高RAP含量的BMD表面混合物的化性能评估
Bilin Tong1, Jhony Habbouche2, Gerardo W Flintsch1
1Virginia Tech Transportation Institute, Blacksburg, VA 24061, USA.
Materials (Basel, Switzerland)
|December 23, 2023
概括
在高回收青路面 (HRAP) 的平衡混合设计 (BMD) 中,青路面呈现出更多的. 这项研究建议降低道深度值,以提高青性能.
科学领域:
- 土木工程 土木工程是指土木工程.
- 材料科学 材料科学 材料科学
- 铺路工程 铺路工程 铺路工程
背景情况:
- 平衡混合设计 (BMD) 提供了超越传统体积要求的创新青混合设计.
- 高回收青路面 (HRAP) 的整合为可持续路面施工提供了机会.
研究的目的:
- 研究不同HRAP含量的BMD表面混合物 (SMs) 的永久变形 (化) 行为.
- 评估环境老化对加快载荷下路性能的影响.
- 评估弗吉尼亚州交通部 (VDOT) 的BMD特殊规定对HRAP混合物的适用性.
主要方法:
- 在增量负载下进行全面加速路面测试 (APT).
- 设计和生产45%和60%RAP含量的HRAP SM.
- 青路面分析仪 (APA) 在生产样本上进行路试验和压力扫描路试验.
- 在APT和实验室路线测试之间的相关性分析.
主要成果:
- 所有的BMD HRAP混合物都显示出比对照混合物更大的深.
- 在HRAP混合物中含有较高的粘合剂含量,用于抗裂性,有助于增加化.
- 在APT和实验室路线测试之间发现了显著的正相关性.
结论:
- 该研究建议改进VDOT BMD APA的车道深度值,从8毫米提高到7毫米.
- 这种调整旨在确保在使用BMD和HRAP的青混合物中获得更好的路径性能.
- 这些发现支持在BMD中需要基于性能的标准,以实现可持续的路面工程.
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