蒙脱土改性沥青的制备及其混合料性能研究

发布时间：2018-04-17 03:07

本文选题：蒙脱土 + 物理性能　；参考：《长安大学》2015年硕士论文

【摘要】：由于道路石油沥青材料独特的物理、流变性能,在道路建设中被广泛使用;但同时其直接接触自然界各种恶劣环境,包括光照、雨水、氧气等以及承受车轮反复荷载作用,其性能衰减严重,进而导致道路路面出现各种病害,制约了经济型道路、长寿命道路的建设发展。本文通过蒙脱土改性普通基质沥青以提高其耐久性,降低道路沥青在使用过程中性能衰减幅度,减少路面病害的发生,延长道路使用寿命。蒙脱土改性沥青制备过程中,采取高速剪切拌和和超声波分散融合的工艺,以加强沥青与蒙脱土于分子级的插层融合;对老化前后改性沥青与基质沥青物理性能和流变性能变化进行试验分析,包括针入度、软化点、延度、粘度试验和温度扫描试验、频率扫描试验、疲劳性能试验等;制作沥青混合料试件并测试了水稳定性能、高温性能、低温性能和疲劳性能。结果表明与单纯使用高剪切乳化机相比,使用超声波分散仪可以更好的提高沥青与蒙脱土融合作用;物理性能试验及流变试验表明蒙脱土改性后沥青粘度和弹性明显提高,并且在高温下粘度增加更为明显,同时沥青的疲劳性能有明显改善;沥青老化前后对比试验结果表明沥青具有良好的抗老化性能,性能衰减速率较小;沥青混合料试验结果同样表明改性沥青混合料具有较高的耐老化性能和抗疲劳性能。同时混合料试验结果表明蒙脱土改性沥青混合料具有良好的高温稳定性。所以添加蒙脱土改性剂能够提高沥青混凝土路面耐久性能和抗疲劳性能,降低车辙等路面病害的产生。
[Abstract]:Because of the unique physical and rheological properties of road petroleum asphalt materials, they are widely used in road construction, but at the same time they are in direct contact with all kinds of harsh environments in nature, including light, Rain Water, oxygen and so on, and bear repeated loads on wheels.The attenuation of its performance leads to various diseases of road surface, which restricts the construction and development of economic road and long life road.In this paper, the common base asphalt modified by montmorillonite is used to improve its durability, reduce the attenuation range of performance, reduce the occurrence of pavement diseases and prolong the service life of road.In the process of preparation of montmorillonite modified asphalt, high speed shear mixing and ultrasonic dispersion fusion were adopted to strengthen the intercalation of asphalt and montmorillonite at molecular level.The physical properties and rheological properties of modified asphalt and matrix asphalt before and after aging were analyzed, including penetration, softening point, ductility, viscosity test and temperature scanning test, frequency scanning test, fatigue performance test, etc.The water stability, high temperature, low temperature and fatigue properties of asphalt mixture were tested.The results show that the ultrasonic dispersion instrument can improve the fusion effect of asphalt and montmorillonite, and the physical property test and rheological test show that the viscosity and elasticity of the modified asphalt can be improved obviously.At high temperature, the viscosity increases more obviously, and the fatigue performance of asphalt is improved obviously, the results of comparison before and after aging show that the asphalt has good anti-aging performance, and the attenuation rate of performance is small.The results of asphalt mixture test also show that the modified asphalt mixture has high aging resistance and fatigue resistance.At the same time, the mixture test results show that the montmorillonite modified asphalt mixture has good high temperature stability.So the addition of montmorillonite modifier can improve the durability and fatigue resistance of asphalt concrete pavement and reduce the occurrence of rutting and other pavement diseases.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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