针对目前沥青混合料受动水压力影响机理和动水压力模拟研究存在的不足,在设计以气压方式激发动水压力试验装置的基础上,对沥青混合料在60 ℃高温、定向动水冲刷模式下的沥青膜剥落规律进行试验研究。结果表明:沥青混合料在定向动水压力作用下,沥青胶浆粘度降低,对集料的粘结力降低,导致试件剪切破坏;沥青层底部存水导致受动水压力作用时间变长,在车轮荷载的补充压实作用下可能发生沥青向上迁移的现象。
Abstract
Aimed at shortage of research on mechanical mechanism and simulation of asphalt mixture influenced by dynamic water pressure, based on designed test equipment of activating dynamic water pressure with vapour-pressure type, asphalt stripping rule of asphalt mixture was studied at 60 ℃ under oriented dynamic water pressure erosion. The results show that decreases of viscosity of asphalt binder and the adhesion of asphalt binder to aggregate cause shearing failure of specimen under the oriented dynamic water pressure of asphalt mixture. The bottom of the asphalt layer is water-filled which makes the acting time of dynamic water pressure longer. The asphalt probably migrates upward under supplementary compaction of wheel load.
关键词
道路工程 /
沥青路面 /
模拟试验 /
水损坏机理 /
动水压力 /
定向动水冲刷
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Key words
road engineering /
asphalt pavement /
simulation test /
mechanism of water damage /
dynamic water pressure /
oriented dynamic water pressure erosion
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中图分类号：
U416.217
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参考文献
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脚注
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基金
国家西部交通建设科技项目(2006 318 812 16);道路灾变防治及交通安全教育部工程研究中心开放基金项目(kfj090306)
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