水性环氧—乳化沥青结构形成及性能影响因素研究

发布时间：2018-01-21 00:50

本文关键词： 水性环氧树脂乳化沥青试验方法粘结强度相结构　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：冷拌沥青路面技术可在常温下生产、施工,节能减排,绿色环保,但其路用性能相对于热拌沥青路面技术还有一定的差距,无法适应我国的交通水平。将水性环氧树脂乳液与乳化沥青共混,期望制备出的水性环氧-乳化沥青复合材料既保持乳化沥青的诸多优秀特性,又具有水性环氧树脂的高粘结力,以满足我国的高等级公路乃至重载交通的应用要求。本文首先选用两种化学接枝法制备的水性环氧树脂,对其固化过程影响因素进行研究,探讨了水性环氧树脂固化成膜的相关试验方法,结果表明,水性环氧树脂固化好坏的关键在于薄膜中的水分能否散失;刚性环氧固化后强度较高,但存在常温难以破乳、固化后水分包裹于薄膜之中的问题;柔性环氧易破乳,固化后薄膜无水分残留,固化强度较刚性环氧略低。经比较后,选择柔性水性环氧树脂,采用自乳化和混合两种方法制备水性环-乳化沥青复合材料。自乳化法制备结果并不理想,所得水性环氧-乳化沥青稳定性差,不能较长时间贮存。混合法将水性环氧树脂分别与阴离子乳化沥青和阳离子乳化沥青共混复配,结果表明,水性环氧树脂与阴离子乳化沥青的相容性较阳离子乳化沥青要好。对水性环氧-阴离子乳化沥青复合材料在不同影响因素下进行性能测试表征。结果表明:固化温度对水性环氧-乳化沥青的影响主要在与前期的固化速度及强度增长速度,对其最终强度影响不大;水性环氧-乳化沥青的最终粘结强度随水性环氧掺量的增加而提高;在水性环氧完全固化后,水性环氧-乳化沥青的粘结强度随着时间推移仍有小幅度增长。使用荧光显微镜观察水性环氧-乳化沥青的微观结构并进行数字图像表征,结果显示:本文所述的水性环氧-乳化沥青为二相体系,沥青为连续相,环氧为分散相;对玻璃、沥青、水泥三种不同基材界面,环氧相分布均匀,纵向无分层;水性环氧树脂在水性环氧-乳化沥青薄膜固化过程中有自行团聚的现象,固化温度越低,固化后环氧树脂团聚越明显;本文所选用的乳化沥青和水性环氧树脂相容性并不最优,水性环氧树脂在该体系下固化后不能理想的交联成网。
[Abstract]:Cold mix asphalt pavement technology can be produced at room temperature, construction, energy saving and emission reduction, green environmental protection, but its road performance compared with the hot mix asphalt pavement technology there is a certain gap. The waterborne epoxy resin emulsion and emulsified asphalt blend can not meet the traffic level in China. The waterborne epoxy emulsified asphalt composite material can not only keep many excellent properties of emulsified asphalt. The waterborne epoxy resin has high adhesion to meet the application requirements of high grade highway and even heavy traffic in China. In this paper, two kinds of chemical grafted epoxy resin were first used to prepare waterborne epoxy resin. The influencing factors of curing process were studied, and the relative test methods of curing film of waterborne epoxy resin were discussed. The results showed that the key of curing waterborne epoxy resin was whether the moisture in the film could be lost. The strength of rigid epoxy resin is high, but it is difficult to demulsify at room temperature. Flexible epoxy resin is easy to demulsify, and the cured film has no moisture residue, and the curing strength is slightly lower than that of rigid epoxy resin. After comparison, flexible waterborne epoxy resin is selected. Waterborne cyclized asphalt composites were prepared by self-emulsification and mixing. The results of self-emulsification were not satisfactory and the stability of waterborne epoxy-emulsified asphalt was poor. Water borne epoxy resin was mixed with anionic emulsified asphalt and cationic emulsified asphalt respectively by mixing method. The compatibility of waterborne epoxy resin and anionic emulsified asphalt is better than that of cationic emulsified asphalt. The effect of curing temperature on waterborne epoxy-emulsified asphalt is mainly related to the curing rate and strength growth rate. It has little effect on the ultimate strength; The ultimate bond strength of waterborne epoxy emulsified asphalt increases with the increase of the content of waterborne epoxy resin. After the waterborne epoxy is completely cured. The bond strength of waterborne epoxy emulsified asphalt increases slightly with time. The microstructure of waterborne epoxy emulsified asphalt is observed by fluorescence microscope and characterized by digital image. The results show that the waterborne epoxy emulsified asphalt is a two-phase system, the asphalt is a continuous phase, and the epoxy is a dispersed phase. For glass, asphalt, cement three different substrate interface, epoxy phase distribution is uniform, longitudinal no delamination; Waterborne epoxy resin has the phenomenon of self-agglomeration during the curing process of waterborne epoxy-emulsified asphalt film. The lower the curing temperature, the more obvious the agglomeration of epoxy resin after curing. The miscibility of emulsified asphalt and waterborne epoxy resin is not optimal in this paper.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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