The Research Of Oil-stone Interface Adhesive Based On Modified Surface Of Asphalt And Stone

Asphalt concrete road appeard phenomena of early water damage widespreadly in asphalt pavement in our country. Early water damage is not only serious in the South with heavy rainfall, but also appeared in varying degrees in the north with relatively little rainfall. Asphalt pavement early water damage occurs very quickly, and seriously affects the development of transportation. The occurence of water damage significantly shortened the life of highway, and shortened the asphalt road maintenance and repair cycles, increased the cost of maintenance and repair. Early water damage of asphalt highway problems not only have a greater impact on highway level of service, and cause significant direct and indirect economic losses, so a system study on control and preventive measures of asphalt pavement early water damage has a significant economic and social significance.Currently, there are two main aspects of method in increasing the adhesion of asphalt and aggregates: first, use the alkaline aggregate and asphalt bonded better; the second is to take some anti-stripping measures or anti-stripping agent.Both methods can be to a certain extent improve the adhesion of asphalt and aggregates, but there is a shortage. When using alkaline aggregate, the water stability of asphalt mixture has improved, but it also has lost strength and resistance of asphalt mixtures fatigue properties. Also, current anti-stripping measures and anti-stripping agent will not be able to fundamentally prevent water damage from occurring. Because the hydrogen bonds between them and aggregate less than bond energy, once the water goes into asphalt concrete, aggregates of hydrophilic surface and water to hydrogen bonding, while replacing asphalt from aggregate cause stripping asphalt membrane. And there are some shortages of above methods, such as increasing works, long term and bad effects, etc. Therefore, based on the occuring mechanism of water damage, locate a thermal stability of anti-stripping performance better, more powerful, easy to use, more environmentally friendly and more economical and practical way to enhance the water stability of asphalt pavement with a very significant meaning. In this paper, starting with changing the surface properties of asphalt and aggregate, through interface modification of the stone surface from hydrophilic to lipophilic and thus achieve the purpose of resistance to water damage. Using silane to granite aggregates when a modification is made, it should first be silane hydrolysis solution preparation. Hydrolysis of solvent should be used (water + alcohol) mixtures. Alcohol solution and a single hydrolysis of deionized water should not be used. Composition of hydrolysis of hydrolysis time control has a great effect on modification effect. According to obtained by hydrolysis of silane coupling agent composition and hydrolysis time-optimal preparation of silane-modified agent solution to surface modification of granite aggregates; using molten aluminum acid ester coupling agent, using granite aggregates modified by dipping method. By lipophilic values test, scanning electron microscope analysis, infrared spectroscopy, differential thermal thermogravimetric test, energy-dispersive x-ray spectroscopy (EDX) analysis of coupling agent on the set of reaction conditions, mechanisms of surface modification of materials, thermal stability, and modification of effect. The feasibility of using whole-doped mixed method is analysis through the observing of contact angle of modified asphalt. In SongYuan area for a test of road repair, road surface through the following observation is discoverd that modified repair materials improve the stability of water and have a significant effect of fatigue resistance.