基于试验验证的旋转压实仪内部角标定研究

Research on Calibrating Internal Angle of SGC Based on Experimental Verification

为确定旋转压实仪（SGC）内部角标定的主要参数,采用国内常见的4台不同种品牌或型号SGC进行了内部角测试,研究了试模温度、偏心距大小和单一偏心距以及3个偏心距对测试结果的影响,并对5种Superpave混合料压实试验进行了验证。结果表明：相同偏心距下,不同SGC的顶部内角与底部内角的大小关系不一,但均随偏心距的增大近似线性减小;测试精度和混合料压实验证试验结果证实可采用常温试模和单一22.07mm偏心距对SGC内部角进行标定;内部角标定后,压实试样毛体积密度的标准差小于0.008g/cm3、空隙率偏差小于0.15%,无系统误差。

In order to determine the main parameters for calibrating internal angle of SGC, the internal angle tests are carried out using 4 different brands or models of SGC in China, the effects of test mode temperature, eccentricity size and using a single eccentricity or 3 eccentricity on test results are studied. Verifications are made against the 5 types of superpave mixtures compaction tests. The result shows that： the top internal angle is smaller or may be larger than the bottom internal angle for different SGCs with the same eccentricity, but both top internal angles and bottom internal angles decrease approximately linear with the increase of the eccentricity for all SGCs; the measuring accuracy of internal angle and the results of compaction experiments show that SGCs can be calibrated using room temperature mold and the eccentricity of 22. 07mm; after the internal angles have been calibrated with room temperature molds, standard deviation of bulk density for compaction samples is less than 0. 008 g/cm3, voids deviations is less than 0.15%, and no system error exists.