沥青混合料抗拧搓松散破坏研究

发布时间：2018-11-13 16:44

【摘要】：拧搓松散破坏是由车轮对沥青路面进行拧搓作用而造成的路面病害,这种病害已经较为常见,但是还处于被人们忽视的位置,被当做水损坏、坑槽、麻面来处置。机场的飞机掉头转弯的路段和飞机起落的跑道路面容易发生拧搓松散破坏;城市道路主要是汽车转弯的多发路段,包括道路交叉口、停车位出入口和立交桥的匝道曲线段,以及路面经常积水的路段;高等级沥青混凝土路面上需要注意的路段是长大纵坡路面和急转弯路面。通过分析沥青混合料拧搓松散破坏的形成原因,发现它受到的作用力的大小和方式有别于其它病害,主要是受到拧搓作用而发生的,这是和车辙及水损害的关键性不同点。沥青混合料在发生拧搓松散破坏时有粘附、粘聚、碎裂三种破坏方式,但是发生的比例不一样,粘聚破坏和碎裂破坏这两种方式的比例居高。为了深入研究沥青混合料的拧搓松散破坏,通过模拟车轮对沥青路面的拧搓作用研发了拧搓松散破坏试验仪,并制定了相应的试验方法、试验参数,以及对试验结果的评价方法。通过正交实验选定了关键试验因素的参数,制定了对于OGFC、SMA、AC三种沥青混合料的拧搓松散试验的试验参数。通过拧搓松散破坏试验可以分析沥青混合料的抗拧搓松散破坏性能,结果表明拧搓松散质量损失越高表明该混合料的抗拧搓松散破坏性能越差。通过对沥青混合料进行拧搓松散破坏试验,认为沥青的产源、标号、类型,集料的岩性,沥青中轻组分的含量,结构类型,施工的质量都会对其抗拧搓松散破坏性能产生影响。针对沥青混合料的抗拧搓松散破坏性能,对其配合比设计进行了改进,包括适用路段、集料指标、拧搓松散质量损失指标、配合比验证方面的可行性建议。
[Abstract]:Twisting loose damage is caused by the twisting of the asphalt pavement caused by the wheel twisting, this disease has been more common, but still in the neglected position, as water damage, pothole, hemp surface to deal with. The airport aircraft turn around the road section and the aircraft landing runway road surface is prone to twisting loose damage; Urban roads are mainly multi-turning road sections, including road intersection, parking entrance and exit and overpass ramp curve section, as well as the road surface often stagnant section; The high-grade asphalt concrete pavement should pay attention to the long vertical slope and sharp turning road surface. By analyzing the causes of the loose damage caused by twisting of asphalt mixture, it is found that the magnitude and mode of the force it is subjected to is different from that of other diseases, and it is mainly caused by twisting, which is the key difference from rutting and water damage. Asphalt mixture has three kinds of failure modes: adhesion, agglomeration and fragmentation, but the proportion of them is different. The proportion of agglutination and fragmentation is high. In order to deeply study the loose damage of asphalt mixture, a test instrument for loosening damage of asphalt pavement was developed by simulating the twisting effect of wheel on asphalt pavement, and the corresponding test method and test parameters were worked out. And the evaluation method of test results. The parameters of the key test factors were selected by orthogonal experiment, and the experimental parameters of the three kinds of OGFC,SMA,AC asphalt mixture were established. The results show that the higher the quality loss of the twisting loose, the worse the destructive energy of the asphalt mixture. It is considered that the source, grade, type, lithology of aggregate, content of light component in asphalt, structure type and construction quality of asphalt mixture will have an effect on its anti-twisting and loosely destructive ability through the test of twisting and loosening failure of asphalt mixture. Aiming at the anti-twisting loose failure performance of asphalt mixture, the design of mix ratio is improved, including applicable road section, aggregate index, loose quality loss index of twist rubbing, and feasibility suggestions on the verification of mix ratio.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U414

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