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为定量描述矿料级配对沥青混合料高低温性能紫外线老化的影响,该文以AC-13S1、S2、S3、S4、S5和AC-16S1、S2、S3、S4、S5共10种级配为研究对象,通过室内紫外线老化试验,研究了紫外线老化前后不同级配沥青混合料动稳定度和低温劈裂强度的变化规律,并按分形几何基本原理,以集料粒径分布分形维数D作为表征不同级配特征的参数,建立了动稳定度降幅、低温劈裂强度降幅与粒径分布分维数D的相关关系。研究结果表明:紫外线老化后沥青混合料动稳定度及低温劈裂强度的降幅与粒径分布分维数D之间存在着较强的线性相关性;粒径分布分维数D越大,沥青混合料动稳定度受紫外线老化作用的影响越强烈,动稳定度降幅越大;粒径分布分维数D越小,沥青混合料低温劈裂强度受紫外线老化作用的影响越强烈,低温劈裂强度降幅越大。
In order to quantitatively describe the effect of aggregate gradation on the UV aging of high and low temperature properties of asphalt mixtures, 10 grades of AC-13S1, S2, S3, S4, S5 and AC- 16S1, S2, S3, S4, The object of the study was to study the variation law of dynamic stability and low-temperature splitting strength of asphalt mixtures with different gradations before and after UV aging by indoor UV aging test. According to the basic principle of fractal geometry and the fractal dimension D of aggregate size distribution, The parameters of different gradation characteristics were characterized and the relationship between the dynamic stability and the fractal dimension D of particle size distribution was established. The results show that there is a strong linear correlation between the drop of dynamic stability and the low-temperature splitting strength of asphalt mixture and the fractal dimension D of the particle size distribution after UV aging. The larger the fractal dimension D of asphalt mixture is, The dynamic stability of the mixture is more affected by UV aging, and the dynamic stability decreases more. The smaller the fractal dimension D of asphalt mixture, the stronger the low temperature splitting strength of asphalt mixture is affected by ultraviolet aging. The low temperature splitting The greater the drop in intensity.