排水沥青混合料永久变形性能试验研究

发布时间：2018-10-24 17:46

【摘要】：采用单轴重复加载蠕变试验研究不同温度和不同应力条件下PA-13排水沥青混合料永久变形性能,给出了采用不同集料类型的PA-13排水沥青混合料永久变形曲线,分析了不同试验条件下材料永久变形及蠕变率曲线的特征参数变化规律,以此对排水沥青混合料高温稳定性进行评价。研究结果表明:不同集料的排水沥青混合料永久变形曲线呈现两阶段变化规律,迅速破坏的第三阶段只在高温高应力水平下才较为明显;随着温度及应力水平变化,永久变形曲线斜率b和蠕变率曲线截距a的变化规律能够表征材料高温性能,两个指标具有较好的区分度;采用石灰岩集料的排水沥青混合料由于较好的级配使其初始高温性能较好,但对于温度和应力水平影响的敏感性更大。
[Abstract]:The permanent deformation behavior of PA-13 drainage asphalt mixture under different temperature and stress was studied by uniaxial repeated loading creep test. The permanent deformation curve of PA-13 drainage asphalt mixture with different aggregate types was given. The variation law of characteristic parameters of permanent deformation and creep rate curves of materials under different test conditions is analyzed to evaluate the high temperature stability of drainage asphalt mixture. The results show that the permanent deformation curve of drained asphalt mixture with different aggregates presents a two-stage variation law, and the third stage of rapid failure is obvious only at high temperature and high stress level, and changes with temperature and stress level. The variation of the slope b of the permanent deformation curve and the intercept a of the creep rate curve can characterize the high temperature properties of the material, and the two indexes have a good degree of distinction. The asphalt mixture with limestone aggregate has better initial high temperature performance due to its better gradation, but it is more sensitive to the influence of temperature and stress level.
【作者单位】：云南省交通规划设计研究院陆地交通气象灾害防治技术国家工程实验室;
【基金】：云南省科技厅科技创新强省国际科技合作专项(2009AC009) 云南省交通规划设计研究院自立科技项目(KXYM-2013-10) 云南省交通运输厅科技项目(云交科教[2014]231号-(二))
【分类号】：U414

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