Anti-rutting Performance of Geosynthetic-reinforced Asphalt Mixture
The effect of geosynthetics-reinforced on asphalt mixture under different reinforcement schemes was studied through laboratory experiments.First,starting from the balance principle and deformation coordination principle of elasticity,considering the influence of the reinforcement bounda-ry conditions,the reinforcement binding force of the geosynthetic in the asphalt layer is deduced.And according to the influencing factors of the reinforcement constraint(the types of geosynthetics,the boundary conditions of the reinforcement and the position of the reinforcement layer),12 kinds of re-inforcement schemes were designed.Finally,the reinforced specimens of asphalt mixture were pre-pared according to the above-mentioned reinforcement scheme and the rutting test was carried out.The research results show that the reinforcement of geosynthetics can restrain the vertical permanent deformation of asphalt mixture under the action of cyclic wheel load in the rutting test,and improve the dynamic stability of rutting.Under the same conditions,the anti-rutting performance of the rein-forced geogrid is much better than that of the geogrid.The anti-rutting performance of the SBS modi-fied asphalt bonding layer is slightly better than that of the epoxy modified asphalt bonding layer and both are better with a bonding layer,the rutting resistance of the middle layer when reinforced is bet-ter than that of the lower layer.
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