机场SMA高温变形中集料倾角变化规律
发布时间：2019-02-12 22:23
【摘要】：为探究机场重载下SMA(沥青玛蹄脂碎石混合料)的车辙变形特性,同时为建立沥青混合料细观模型提供数据支持,针对SMA高温变形过程中集料倾角的变化规律开展研究.采用车辙试件取芯方式,研究沥青混合料在高温及高荷载作用下集料倾角随碾压次数的变化规律.基于X-射线CT技术获取并重构了碾压前后沥青混合料的三维数字图像,提取了数字试件沿轮迹方向和垂直轮迹方向的二维图像,采用MATLAB编写图像的批量处理程序,获取二值化图像,进行集料倾角的计算和统计.结果表明:沥青混合料集料倾角的累计分布概率符合三参数威布尔分布;混合料集料倾角在0°~20°分布最多;碾压后,沿轮迹方向0°~20°区间集料倾角概率保持增大,垂直轮迹方向40°~60°区间集料倾角概率保持增大;沿轮迹方向集料倾角变化与车辙变形线性相关;掺加70#沥青的SMA集料较掺加SBS改性沥青的SMA集料倾角更易偏转.
[Abstract]:In order to investigate the rutting deformation characteristics of SMA (bituminous maleic macadam mixture) under heavy load of airport and to provide data support for the establishment of mesoscopic model of asphalt mixture, the variation law of aggregate inclination during high temperature deformation of SMA was studied. The change of aggregate dip angle with rolling times under high temperature and high load was studied by means of rutting sample coring method. The 3D digital image of asphalt mixture before and after rolling is acquired and reconstructed based on X- ray CT technology. The 2D image of digital specimen along the direction of wheel track and vertical direction of wheel track is extracted, and the batch processing program of image is compiled by MATLAB. The binary image is obtained and the aggregate dip angle is calculated and counted. The results show that the cumulative distribution probability of aggregate dip angle of asphalt mixture accords with the Weibull distribution of three parameters, and the aggregate inclination angle of asphalt mixture is the most distributed between 0 掳and 20 掳. After rolling, the probability of aggregate dip increases in the range of 0 掳~ 20 掳along the wheel track direction, and the probability of the aggregate dip angle increases in the range of 40 掳~ 60 掳in the vertical wheel track direction, and the change of aggregate dip angle along the wheel track direction is linearly related to the rutting deformation. SMA aggregate with 70# asphalt is easier to deflect than SMA aggregate with SBS modified asphalt.
【作者单位】： 哈尔滨工业大学交通科学与工程学院;四川省交通运输厅公路规划勘察设计研究院;辽宁省交通科学研究院;中国民航机场建设集团公司;
【基金】：国家杰出青年基金资助项目(51225803) 国家自然科学基金资助项目(51208154)
【分类号】：U414;V351.11
，
本文编号：2420847
[Abstract]:In order to investigate the rutting deformation characteristics of SMA (bituminous maleic macadam mixture) under heavy load of airport and to provide data support for the establishment of mesoscopic model of asphalt mixture, the variation law of aggregate inclination during high temperature deformation of SMA was studied. The change of aggregate dip angle with rolling times under high temperature and high load was studied by means of rutting sample coring method. The 3D digital image of asphalt mixture before and after rolling is acquired and reconstructed based on X- ray CT technology. The 2D image of digital specimen along the direction of wheel track and vertical direction of wheel track is extracted, and the batch processing program of image is compiled by MATLAB. The binary image is obtained and the aggregate dip angle is calculated and counted. The results show that the cumulative distribution probability of aggregate dip angle of asphalt mixture accords with the Weibull distribution of three parameters, and the aggregate inclination angle of asphalt mixture is the most distributed between 0 掳and 20 掳. After rolling, the probability of aggregate dip increases in the range of 0 掳~ 20 掳along the wheel track direction, and the probability of the aggregate dip angle increases in the range of 40 掳~ 60 掳in the vertical wheel track direction, and the change of aggregate dip angle along the wheel track direction is linearly related to the rutting deformation. SMA aggregate with 70# asphalt is easier to deflect than SMA aggregate with SBS modified asphalt.
【作者单位】： 哈尔滨工业大学交通科学与工程学院;四川省交通运输厅公路规划勘察设计研究院;辽宁省交通科学研究院;中国民航机场建设集团公司;
【基金】：国家杰出青年基金资助项目(51225803) 国家自然科学基金资助项目(51208154)
【分类号】：U414;V351.11
，
本文编号：2420847
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