泡沫沥青冷再生胶结料界面黏聚性的改善方法OA

To improve the cohesiveness of foam asphalt cold recycled binder(composed of cement,old asphalt,and foam asphalt),three modifiers of foam asphalt cold recycled binder,including polyphosphoric acid(PPA),polymerized styrene butadiene rubber(SBR),and triglyceride(TG)were selected,and molecular models of foam asphalt cold recycled binder with different modifiers and their dosage were established by molecular dynamics simulation method.The effect of different modifiers and their dosage on the improvement of the interface properties of foam asphalt cold recycled binder was studied based on interface energy,interaction energy,diffusion coefficient,and radial distribution function(RDF)of water molecules.The significance difference of each index and the weight of the modification scheme were discussed by significance tests and the analytic hierarchy process.The results have shown that the addition of 0.8%PPA has the most significant effect on the cohesiveness of the foam asphalt cold recycled binder,which can effectively improve the interfacial energy,free volume,and water damage of the foam asphalt cold recycled binder,and also make the foam asphalt cold recycled binder have better diffusion ability.The addition of 15.0%TG can improve the interaction effect of the foam asphalt cold recycled binder,but the diffusion ability is poor.The addition of 2.0%SBR has the best effect on the water damage resistance of foam asphalt cold recycled binder,but the overall modification effect of SBR is not so good.There is no significant influence among different dosages of modifiers,and each modification scheme is independent and has its own advantages.After comprehensive comparisons,0.8%PPA has the best effect on improving the interfacial cohesiveness of foam asphalt cold recycled binder.