基于X-ray CT的沥青混合料空隙测试精度影响因素分析

发布时间：2018-09-06 19:21

【摘要】：为了分析细观尺度下沥青混合料空隙率测试精度的影响因素,采用德国Phoenix v|tome|x S240型工业X-ray CT机,结合正交试验设计与方差分析,研究不同CT参数及级配类型对沥青混合料三维重构体积参数的影响.通过对不同级配类型马歇尔试件扫描并进行三维重构与体积分析,建立影响因素与空隙率测试结果之间的关系,进而确定最优扫描参数.试验结果表明,基于细观尺度对沥青混合料进行三维体积分析是可行的;扫描电压、电流及级配类型对重构结果有不同程度的影响;适当提高电压、电流及选择恰当的滤波片可提高测试结果的准确性;在恰当的设备参数条件下,基于细观尺度与宏观尺度下得到的沥青混合料空隙率具有良好的相关性,有助于提高测试结果的准确性与试验的经济性.
[Abstract]:In order to analyze the influence factors of voidage testing precision of asphalt mixture on mesoscale scale, German Phoenix v tome x S240 industrial X-ray CT machine was adopted, combined with orthogonal test design and variance analysis. The effects of different CT parameters and gradation types on the volume parameters of asphalt mixture were studied. The relationship between the influence factors and the voidage test results was established by scanning the Marshall specimen with different gradation types, and the 3D reconstruction and volume analysis were carried out, and the optimal scanning parameters were determined. The experimental results show that 3D volume analysis of asphalt mixture based on mesoscale is feasible, scanning voltage, current and grading type have different effects on reconstruction results, and the voltage is increased appropriately. The accuracy of the test results can be improved by selecting the appropriate filter current and the porosity of asphalt mixture based on mesoscale and macroscopic scale is well correlated with the appropriate equipment parameters. It is helpful to improve the accuracy of the test results and the economy of the test.
【作者单位】：哈尔滨工业大学交通科学与工程学院;辽宁省交通科学研究院;
【基金】：国家杰出青年科学基金资助项目(51225803)
【分类号】：U414

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