石头青混合物的机械疲劳性能评估:青性能等级和弹性恢复的影响
Jongsub Lee1, Sungjin Lee2, Yujoong Hwang1
1Pavement Research Division, Korea Expressway Corporation Research Institute, Hwaseong 18489, Republic of Korea.
Polymers
|September 14, 2024
概括
这项研究表明,改性青粘合剂提高了石头青 (SMA) 的裂抵抗力. 测试证实增强弹性回收和减少在高温和低温下破裂.
科学领域:
- 材料科学 材料科学 材料科学
- 土木工程 土木工程是指土木工程.
- 铺路工程工程 铺路工程
背景情况:
- 石头青 (SMA) 在路面施工中广泛使用.
- 评估改性青粘合剂的裂变性能对于路面的耐用性至关重要.
- 现有的方法需要对粘合剂和混合物特性进行全面评估.
研究的目的:
- 为了评估石青 (SMA) 混合物与改性青结合剂的破裂性能.
- 通过使用青性能等级 (PG) 和多重应力爬行和恢复 (MSCR) 测试来评估粘合剂性能.
- 用动态模量和直接张力循环疲劳试验分析混合物裂变行为,并结合粘弹性连续损伤 (VECD) 理论.
主要方法:
- 准备和测试了六种SMA聚合物分级 (10毫米NMAS) 的改性青混合物.
- 使用MSCR测试 (AASHTO M 320,T 350) 评估了结合剂的性能.
- 通过动态模量和直接张力循环疲劳测试 (AASHTO T 378,T 400) 和VECD理论来评估混合物破裂性能.
主要成果:
- 基于的PG76-28粘合剂在MSCR测试中显示出最少的初始应变和最高的弹性恢复.
- 的修改增强了高温弹性模块,降低了低温模块,改善了夏季和冬季的性能.
- 该研究发现,VECD明显损伤能力 (Sapp) 和弹性恢复 (0.87) 和混合物疲劳寿命 (0.76) 之间存在强烈的相关性.
结论:
- 用改性青粘合剂显著提高了SMA混合物的抗裂性能.
- PG分级和MSCR测试有效地描述了路面应用中的粘合剂性能.
- VECD理论为混合物疲劳性能和允许的重型车载负载提供了宝贵的见解.
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