基于模量及温度应力的硬质沥青稳定碎石低温性能研究
Research on Low Temperature Performance of Hard Asphalt Treated Broken Stone Based on Modulus and Temperature Stresses
姚锐 1王黎明 1孙永卓 1张道明1
作者信息
- 1. 东北林业大学土木与交通学院,黑龙江哈尔滨 150040
- 折叠
摘要
大粒径沥青稳定碎石的冻断或弯曲试验实现较为困难,为了研究硬质沥青稳定碎石的低温性能,设计了宽温度范围模量主曲线及低温开裂温度两种评价方法.基于模量主曲线,发现硬质沥青稳定碎石的动态模量在35℃环境下比普通沥青稳定碎石高112％,而在-20℃时则仅比普通沥青稳定碎石高19％;通过温度应力和抗拉强度计算的低温开裂温度发现,硬质沥青和普通沥青稳定碎石的低温开裂温度均达到了-20℃以下,前者仅比后者高3℃.模量和低温开裂温度两方面的分析评价表明,硬质沥青稳定碎石的低温性能比普通沥青稳定碎石略低,但应用于非严寒环境时不会明显提高路面低温开裂的可能.
Abstract
It is more difficult to realize freeze fracture or bending test for large-size asphalt treated broken stone.In order to study the low-temperature performance of hard asphalt treated broken stone,two evaluation methods,namely,modulus master curve for a wide range of temperatures and low-temperature cracking temperature,were designed.Based on the modulus master curve,it was found that the dynamic modulus of hard asphalt treated broken stone was 112％higher than that of ordinary asphalt treated broken stone at 35 ℃,while it was only 19％higher than that of ordinary asphalt treated broken stone at-20 ℃.It was found that the low-temperature cracking temperatures calculated by temperature stress and tensile strength of both hard asphalt and ordinary asphalt treated broken stone reached the low-temperature cracking temperatures of less than-20 ℃,with the former was only 3 ℃ higher than the latter.The analysis and evaluation of both modulus and low-temperature cracking temperature show that the low-temperature performance of hard asphalt treated broken stone is slightly lower than that of ordinary asphalt treated broken stone,but it does not significantly increase the possibility of low-temperature cracking of pavements when they are applied to non-cold environments.
关键词
硬质沥青/沥青稳定碎石/动态模量/温度应力Key words
hard asphalt/asphalt treated broken stone/dynamic modulus/temperature stresses引用本文复制引用
基金项目
国家自然科学基金面上项目(52278449)
黑龙江省交通运输厅科技项目(20210027)
出版年
2024
国家科技期刊平台
NSTL
万方数据