| As a new type of road building material,epoxy resin asphalt has received more and more attention in recent years in the fields of bridge deck pavement and airport pavement maintenance.As a typical composite material,how epoxy resin and asphalt can be better compatible and exert their respective advantages has been the focus of researchers at home and abroad.In addition,as a kind of relatively costly road building material,how to reduce the cost of epoxy asphalt,in response to the country's call to build green and sustainable transportation,is the key to further promote the wider application of resin asphalt.Based on the above research background,quantum chemical methods were used to study the curing process of resin bio-asphalt,and the preparation process and road performance of resin bio-asphalt were studied by experimental research.These achievements will help to better guide the design and preparation of resin bio-asphalt materials,laying a good technical foundation for the gradual industrialization of resin bio-asphalt.Firstly,quantum chemistry simulations were used to explain the curing reaction mechanism.The molecular structure was determined based on the existing data of each raw material and the infrared spectrum,and then the model of each molecule was constructed in the Dmol3 module in the Materials Studio program and the configuration optimization was performed.Then the two methods based on the single-step method and the two-step method were used.The reaction methods were optimized to search for transition states,and the free energy in the reaction was obtained.The size of free energy was compared to determine the two-step method of chemical reaction as the most suitable reaction method.Finally,the three-dimensional image explains the transfer process of electrons in the reaction and the process of chemical bond cleavage and formation,which explains the mechanism of the two-step curing reaction.Secondly,single-step and two-step methods were used to explore the preparation process of resin bio-asphalt and verify the molecular simulation.The verification results show that the preparation process based on the two-step method can indeed achieve the desired product.In addition,the correctness of the simulation was verified from the perspective of the infrared spectrum.Then,explore the reaction temperature,reaction time,etc.on the product yield impact through numerous experiments,and finally determine the resin bio-asphalt formulations in the various types of raw material dosage and give the preparation of different conditions under the temperature and time.Thirdly,according to the foregoing preparation process,different ratios of resin bio-asphalt were prepared and tested for performance.Dynamic shear rheological tests and bending beam rheological tests are used to investigate the rutting factor,phase angle,and creep stiffness at low temperatures of three different formulations of the material,and the most suitable formulation is determined.The test results show that the resin bio-asphalt under the most suitable formulation has superior high-temperature deformation resistance,lower temperature sensitivity,and excellent low-temperature crack resistance compared to petroleum pitch.Finally,90# matrix asphalt,SBS asphalt and the optimal formulation of resin bio-asphalt mixtures were used to study the related road performance.Dynamic modulus tests,rheological tests,and semi-circular bending tests at low temperatures were conducted to investigate the dynamic modulus master curve,phase angle,rheological time,fracture energy,fracture toughness,stiffness and other performance of three types of asphalt mixtures.From different frequencies,different temperatures and other conditions,it is proved that the resin bio-asphalt mixture independently developed has excellent low-temperature crack resistance,medium-temperature anti-fatigue properties and high-temperature anti-deformation properties relative to ordinary petroleum asphalt mixture. |
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