Development Of Epoxy Asphalt For Steel Bridge Deck Pavement And Study On Mixture Performance

Epoxy asphalt has become the preferred material for steel bridge deck pavement at home and abroad because of its high seismic,fatigue and bonding strength.At present,epoxy asphalt is mostly imported from abroad.It is expensive and its formula is confidential,which increases the construction cost of bridges.At the same time,the designers always emphasize the fatigue resistance of the pavement layer,which leads to the poor anti-slide performance of the steel deck pavement in China.In view of this,this paper first develops a kind of epoxy asphalt which has high performance and low cost and studies its curing kinetics,then designs mix proportion of epoxy asphalt based on skid resistance and fatigue performance,and studies the pavement performance of the epoxy asphalt and design gradation through experiments.After gradual exploration and research,considering the properties of epoxy asphalt,such as reserved time,viscosity,mechanical properties and microscopic structure,the optimum ratio of three raw materials is determined.The optimum curing temperature of self-made epoxy asphalt was determined by the law of viscosity change and the reserved time,The low temperature performance of self-made epoxy asphalt was studied by DMA test and BBR test,The low temperature performance of epoxy asphalt was evaluated by glass transition temperature and verified.Infrared spectroscopy and fluorescence experiments were used to study the curing process of the self-made epoxy asphalt and the microscopic phase changes during the curing process.Study on curing kinetics of self-made epoxy asphalt by DSC experiment,three key control temperatures of self-made epoxy asphalt during curing were obtained.According to the model method,the three factors of curing kinetics were calclated and the curing kinetics equation of self-made epoxy asphalt was determined,which can provide theoretical guidance for construction.Reference design method of asphalt mixture proportion at home and abroad,designing multiple sets of epoxy asphalt mixture proportion by variable i method.Optimizing and screening by means of Bailey method and Superpave method.Finally,the design mixture proportion is re-screened based on the anti-skid and anti-fatigue properties,a mix proportion of both anti-slip performance and anti-fatigue performance is obtained.The high temperature stability,low temperature crack resistance,water stability,oil corrosion resistance and economy of self-made epoxy asphalt were studied by experiments,and compared with HLJ-2910 epoxy asphalt.The adhesion between epoxy asphalt and aggregates was studied by rigorous and scientific photoelectric colorimetry.The results show that all road performance indicators of the self-made epoxy asphalt mixture meet the specification requirements.Based on self-made epoxy asphalt,the pavement performance of the designed mixture proportion was studied and compared with the recommended mix proportion in the guide,the results show that the anti-skid performance and high temperature stability of the designed mix proportion are better than those recommended in the guide.The low temperature performance is equivalent,fatigue resistance and water stability are slightly poor,overall performance is excellent.According to the time-temperature characteristics of epoxy asphalt,studying the served time of self-made epoxy asphalt mixture by testing the basic indicators of self-made epoxy asphalt specimens under different temperature conditions.At the same time,the curing time of self-made epoxy asphalt mixture under different curing conditions was studied,which laid a foundation for the popularization and application of self-made epoxy asphalt.