基于分形理论的温拌沥青混合料技术性能指标的研究
发布时间：2019-04-15 22:55
【摘要】：温拌沥青混合料作为一种新型的混合料,对减少道路施工中二氧化碳与其他气体污染物的排放具有重要的意义。传统上用来评价温拌沥青混合料多从宏观上来评价,如空隙率,稳定度,流值,动稳定度等指标,然而这些指标在用来评价混合料的性能时都存在自己的不足之处。沥青混合料作为集料,沥青胶浆,空隙的三相结合体,其宏观所表现出的性能与其微观结构密不可分。本文从集料的分形特征研究开始,对温拌沥青混合料的宏观性能进行试验,同时也对温拌沥青混合料的微观结构进行研究,给出一些评价温拌沥青混合料的微观指标,并尝试建立微观评价指标与宏观评价指标的联系。 本文中选用骨架密实型级配SMA作为研究对象,压实温度为150℃,分别采用马歇尔压实法,旋转压实法,轮碾法等方式成型。成型前先对所使用的集料进行分档,之后对集料的分形特征进行研究。成型之后对温拌SMA的宏观性能指标,如空隙率,稳定度,流值,冻融劈裂强度比,动稳定度等性能进行测试,并同时获取温拌沥青混合料的微观结构图像。采用相关软件对温拌沥青混合料的微观结构图像进行处理,之后得到评价温拌沥青混合料的微观指标。最后,对温拌沥青混合料的宏观评价指标和微观评价指标进行研究,探寻这两者之间的联系。 研究发现,集料的分形值与其面积成反比,集料的面积越大,其分形值越小。其次,集料的无标度区间是有限的,超过一定区间后集料的分形值将会有重大的改变。对于不同岩质的集料(石灰岩与玄武岩),它们之间的分形特征相似。 对于温拌沥青混合料SMA,其宏观性能与其空隙率有着密切的联系,随着压实次数的改变其空隙率也不同,所对应的宏观性能也不同。当压实次数达到一定的次数后,压实次数的增加对温拌沥青混合料宏观性能的提升的作用将变得很小。对于温拌沥青混合料的微观结构来讲,其空隙率的单位面积分维值随着压实次数的增加而增加。温拌沥青混合料的宏观性能与其微观空隙率的单位面积分维值存在着不同的线性关系,其宏观性能,稳定度,冻融劈裂强度比随着空隙率的单位面积分维值增加而增加,流值,最终变形随着单位面积分维值的增加而减小。
[Abstract]:The warm-mix asphalt mixture is a new kind of mixed material, which is of great significance to reduce the emission of carbon dioxide and other gaseous pollutants in the road construction. The traditional method is used to evaluate the indexes such as void ratio, stability, flow value and dynamic stability of warm-mixed asphalt mixture, but these indexes have their own shortcomings when used to evaluate the performance of the mixed materials. As the three-phase combination of aggregate, asphalt cement and air gap, the performance of asphalt mixture is closely related to its microstructure. In this paper, from the study of the fractal characteristics of the aggregate, the macroscopic performance of the mixed asphalt mixture was tested, and the microstructure of the mixed asphalt mixture was also studied. The micro-index of the mixed asphalt mixture was given. And attempts to establish the relationship between the micro-evaluation index and the macro-evaluation index. In this paper, the skeleton dense graded SMA is selected as the research object, the compaction temperature is 150 鈩，
本文编号：2458565
[Abstract]:The warm-mix asphalt mixture is a new kind of mixed material, which is of great significance to reduce the emission of carbon dioxide and other gaseous pollutants in the road construction. The traditional method is used to evaluate the indexes such as void ratio, stability, flow value and dynamic stability of warm-mixed asphalt mixture, but these indexes have their own shortcomings when used to evaluate the performance of the mixed materials. As the three-phase combination of aggregate, asphalt cement and air gap, the performance of asphalt mixture is closely related to its microstructure. In this paper, from the study of the fractal characteristics of the aggregate, the macroscopic performance of the mixed asphalt mixture was tested, and the microstructure of the mixed asphalt mixture was also studied. The micro-index of the mixed asphalt mixture was given. And attempts to establish the relationship between the micro-evaluation index and the macro-evaluation index. In this paper, the skeleton dense graded SMA is selected as the research object, the compaction temperature is 150 鈩，
本文编号：2458565
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