真空密封法测定沥青混合料毛体积相对密度试验

使用真空密封法,测定了不同碾压次数成型试件的毛体积相对密度,探讨了测定时产生误差的原因;与传统表干法以及蜡封法测定的结果进行对比分析。结果表明:真空密封状态与密封袋的材质是影响试验误差的主要因素;使用真空密封法测定的结果重复性较好,其测定值与表干法以及蜡封法测定值间有良好的线性关系,但测定值间存在显著性差异。

Research on Asphalt Mixture Bulk Specific Gravity by Vacuum Sealing Method

Through vacuum sealing method,bulk specific gravity of rutting core samples after being rolled different times was measured,reasons for the errors were discussed;comparative analysis was made between results by conventional method of saturated-surface dry method and by wax-enveloped method.Results showed that the vacuum sealed condition and quality of sealed bag were the main factors for the error.The result by vacuum sealing method had good reproducibility,and its measured value had good linear relationship with the values measured by saturated-surface dry method and by wax-enveloped method;however,there were significant differences between values.