水对沥青混合料疲劳性能影响的试验模拟研究

研究水对沥青混合料疲劳性能的影响，初步分析水使混合料抗疲劳性能下降的力学机理。本研究采用试验模拟的方法，采用4种级配沥青混合料，对试件设计了两种水处理条件，与未经水处理试件的疲劳试验结果进行对比，并运用统计分析方法对试验数据进行处理。与未经水处理试件相比，经两种水处理条件处理后试件的疲劳寿命均缩短。水使沥青混合料力学性能发生改变而使其疲劳寿命缩短，初步分析水使沥青混合料力学性能发生改变而使其疲劳寿命缩短的原因可能与水的作用使沥青混合料劲度模量指标减小有关。

Test Simulation and Study on Effect of Water on Fatigue Properties of Asphalt Mixtures

The study is aimed to identify how the moisture affects fatigue properties of asphalt mixtures.On the basis of the test results, fundamental mechanics mechanism of the attenuation of fatigue properties of mixtures is analyzed.Test simulation method is used in this study. Asphalt mixtures with four different aggregate grades are chosen and two kinds of moisture conditions designed to treat the specimens before the fatigue test of asphalt mixtures. Statistic analysis principles are utilized to analyze the test results and the fatigue life of the specimens that have been marinated by water and those original specimens without any treatment.Results compared with the fatigue life of those original specimens, the fatigue life of specimen treated with different moisture condition is short.The preliminary conclusion is that the moisture can influence mechanical properties of asphalt mixtures and therefore shorten their fatigue life. According to the analysis, the reason of this phenomenon may be that the stiffness modulus of asphalt mixtures has been diminished with the effect of moisture.