集料特性对改性乳化沥青及微表处混合料技术性能的影响研究

发布时间：2019-06-04 22:32

【摘要】：随着我国交通事业的发展，我国的公路网建设逐渐趋于完善。对已建成的沥青路面高速公路的养护与病害防治工作也引起了广泛的关注。作为一种良好的预防性养护措施，微表处技术在国内外的应用也日益广泛。首先，本文分析了改性乳化沥青的乳化机理、储存稳定性机理以及破乳机理。然后通过室内试验，总结了在制备阳离子改性乳化沥青的过程中，基质沥青、乳化剂剂量、改性剂剂量、剪切时间以及稳定剂等因素对改性乳化沥青的制备过程、技术参数以及储存稳定性等的影响。其次，通过X-荧光光谱分析及电渗仪分别分析了石灰岩、玄武岩及花岗岩三种集料的主要化学成分及表面ζ电位。结果表明石灰岩的主要化学成分是碳酸钙，而玄武岩和花岗岩中的二氧化硅含量分别为55.851%及86.74%；在水环境条件下，石灰岩集料表面带有一定的正电荷，而玄武岩和花岗岩集料表面带有一定的负电荷，三种集料的表面ζ电位分别为+11.32mV、-9.87mV以及-29.75mV。然后结合电荷理论及化学反应理论，分析了三种集料的细集料分别与阳离子改性乳化沥青拌和后，集料胶浆粘度变化趋势受集料岩性、表面电荷特性及比表面积等因素的影响而存在的差异。再次，利用龚帕斯模型公式研究了集料胶浆的粘度变化规律，比较了龚帕斯模型公式的计算值与实测值之间的差异，结果表明龚帕斯模型公式计算值误差率的极大值均未超过20%，从而验证了龚帕斯模型公式在拟合集料胶浆粘度变化规律方面的可行性。然后根据龚帕斯模型公式提出了判定胶浆中改性乳化沥青完全破乳的评价指标（t），，并讨论了（t）的取值范围以及集料特性对（t）取值的影响。最后，分别测定了石灰岩、玄武岩以及花岗岩等三种微表处混合料的各种技术性能指标。分析了三种微表处混合料的可拌和时间、粘聚力值、湿轮磨耗值以及负荷车轮粘砂量等指标之间存在的差异。为以后的微表处路面施工提供了一定的参考及指导作用。
[Abstract]:With the development of transportation in our country, the construction of highway network in our country tends to be perfect gradually. The maintenance and disease prevention of asphalt pavement expressway have also attracted extensive attention. As a good preventive maintenance measure, micro-surface technology is widely used at home and abroad. Firstly, the emulsification mechanism, storage stability mechanism and demulsification mechanism of modified emulsified asphalt are analyzed in this paper. Then, through laboratory tests, the preparation process of modified emulsified asphalt was summarized by matrix asphalt, emulsifier dose, modifier dose, shear time and stabilizer in the process of preparing cationic modified emulsified asphalt. The influence of technical parameters and storage stability. Secondly, the main chemical components and surface Zeta potential of limestone, basalt and granite were analyzed by X-fluorescence spectroscopy and electroosmosis instrument, respectively. The results show that the main chemical composition of limestone is calcium carbonate, while the content of silicon dioxide in basalt and granite is 55851% and 86.74%, respectively. Under the condition of water environment, the limestone aggregate surface has a certain positive charge, while the basalt and granite aggregate surface has a certain negative charge. The surface Zeta potentials of the three aggregates are 11.32 MV, 9.87 MV and-29.75 MV, respectively. Then, combined with charge theory and chemical reaction theory, it is analyzed that after the fine aggregate of three kinds of aggregate is mixed with cationic modified emulsified asphalt, the viscosity change trend of aggregate slurry is affected by aggregate lithology. There are differences in surface charge characteristics and specific surface area. Thirdly, the viscosity variation law of aggregate mortar is studied by using Gompas model formula, and the difference between the calculated value and the measured value of Gompas model formula is compared. The results show that the maximum error rate of the calculated value error rate of Gompas model formula is not more than 20%, which verifies the feasibility of Gompas model formula in fitting the viscosity change law of aggregate slurry. Then, according to the Gompas model formula, the evaluation index (t), for judging the complete demulsification of modified emulsified asphalt in mortar is put forward, and the range of (t) and the influence of aggregate characteristics on the value of (t) are discussed. Finally, the technical performance indexes of limestone, basalt and granite were measured respectively. The differences among the mixing time, cohesion value, wet wheel wear value and load wheel sand adhesion of the three kinds of micro-surface mixtures are analyzed. It provides a certain reference and guidance for the construction of micro-surface pavement in the future.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

【参考文献】