AC-13改性沥青混合料劈裂强度的影响因素及其与马歇尔性能指标的相关性

应用正交试验设计和统计分析方法研究了AC-13改性沥青混合料在15℃时的劈裂强度的影响因素和排序,以及与马歇尔性能指标的相关性。结果表明,细集料级配对劈裂强度影响显著,其筛孔通过率的排序为2.36mm筛孔4.75mm筛孔0.075mm筛孔油石比9.5mm筛孔。其中,2.36mm筛孔通过率对劈裂强度影响接近高度显著,而油石比和9.5mm筛孔通过率对劈裂强度影响不显著;劈裂强度与马歇尔性能指标之间存在较为明显的线性相关性,绝对相关系数均大于68%,随空隙率的逐渐增大,劈裂强度衰减近30%。

Factors affecting splitting strength for AC-13 modified asphalt mixture and Marshall performance standard correlation

The affecting factors of the 15 ℃ splitting strength of AC-13 modified asphalt mixture,their significantly order and their correlation with the Marshall performance index were investigated by means of the orthogonal test design and the statistical analysis method.The results showed that the fine aggregate gradation affects significantly the 15 ℃ splitting strength,the significance order of the factors is:2.36 mm passing rate>4.75 mm passing rate>0.075 mm passing rate>OAC>9.5 mm passing rate.The 2.36 passing rate shows highly significant effect on the splitting strength,while the OAC and the 9.5 mm passing rate have no significant effect.The splitting strength is obviously linearly correlated with the Marshall performance index with an absolute correlation coefficient of more than 68%.Along with the gradual increase of VV,the splitting strength of the asphalt mixture decays nearly by 30%.