耐低温高性能环氧沥青的制备及其低温性能研究

发布时间：2018-05-02 12:07

本文选题：环氧沥青 + 增韧　；参考：《东南大学》2015年硕士论文

【摘要】：环氧沥青是采用基质沥青、环氧树脂、固化剂和添加剂等多种材料制备得到的新型改性沥青,具有强度高、耐疲劳、性能稳定等优点,但与其他沥青材料相比,环氧沥青混合料在低温下易产生较大的温度应力而导致开裂。因此,有必要通过一定的技术手段提高环氧沥青材料的柔韧性,并对改善后材料低温性能开展深入研究。首先,通过对现有的环氧树脂增韧技术手段进行对比研究分析,并通过引入不同数均分子量的柔性链段共制备得到三种环氧沥青材料,结合马歇尔设计方法对自制环氧沥青材料进行了配合比设计；通过小梁弯曲破坏试验对其低温性能进行初步评价,发现引入柔性链段数均分子量越大,材料破坏荷载越小,低温变形能力越强。其次,对自制环氧沥青材料和普通国产环氧沥青材料进行了不同温度下的蠕变试验。通过对蠕变柔量和蠕变速率两个指标的对比分析,对自制环氧沥青材料的低温粘弹特性进行了研究。再次,构建自制环氧沥青混合料的经典Burgers模型和分数导数Kelvin模型,采用分数导数Kelvin模型和Burgers模型对环氧沥青材料的蠕变柔量曲线进行拟合；通过非线性回归方法得到相应的粘弹性模型参数,并对拟合结果进行了分析。最后,根据时温等效性原理及WLF公式建立了材料蠕变柔量主曲线,并对自制环氧沥青混合料及普通国产环氧沥青混合料在降温过程中内部的温度应力进行了研究,发现相同温度下引入柔性链段数均分子量越大,混合料的温度应力越小。
[Abstract]:Epoxy asphalt is a new type of modified asphalt prepared from matrix asphalt, epoxy resin, curing agent and additive. It has the advantages of high strength, fatigue resistance and stable performance, but compared with other asphalt materials, epoxy asphalt is a new type of modified asphalt. Epoxy asphalt mixture is easy to produce large thermal stress at low temperature and lead to cracking. Therefore, it is necessary to improve the flexibility of epoxy asphalt materials through certain technical means, and to carry out in-depth research on the low temperature properties of the improved materials. Firstly, by comparing and analyzing the existing toughening technology of epoxy resin, three kinds of epoxy asphalt materials were prepared by introducing flexible segment with different number average molecular weight. Combined with Marshall design method, the mixture ratio of epoxy asphalt materials made by ourselves was designed, and the low temperature performance of epoxy asphalt materials was preliminarily evaluated by trabecular bending failure test. It was found that the larger the average molecular weight of the introduced flexible segments, the smaller the damage load of the materials. The higher the deformation capacity at low temperature. Secondly, creep tests at different temperatures were carried out on the epoxy asphalt materials made by ourselves and common epoxy asphalt materials made in China. The low temperature viscoelastic properties of epoxy asphalt were studied by comparing the creep compliance and creep rate. Thirdly, the classical Burgers model and fractional derivative Kelvin model of epoxy asphalt mixture are constructed, and the creep compliance curve of epoxy asphalt mixture is fitted by fractional derivative Kelvin model and Burgers model. The parameters of the viscoelastic model are obtained by nonlinear regression method, and the fitting results are analyzed. Finally, according to the principle of time-temperature equivalence and WLF formula, the main creep compliance curve of materials is established, and the internal thermal stress of self-made epoxy asphalt mixture and common domestic epoxy asphalt mixture in the process of cooling down is studied. It is found that the greater the average molecular weight of the number of flexible segments introduced into the mixture at the same temperature, the smaller the temperature stress of the mixture.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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