Study on the Effect of RAP Content on the Performance of AC-13 Recycled Asphalt Mixture
In order to study the effect of asphalt mixture recycled material(RAP)content on the performance of AC-13 recycled asphalt mixture,three kinds of AC-13 recycled asphalt mixture were designed,and the porosity,water immersion residual stability,freeze-thaw splitting strength ratio,dynamic stability,and flexural tensile strain,bending tensile strength and flexural stiffness modulus of the reclaimed asphalt mixture under the same gradation were tested at the optimal asphalt content under the same gradation.The results show that the amount of RAP will significantly affect the optimal amount of asphalt,and under the premise of the optimal amount of asphalt,the increase of RAP content will lead to an increase in the residual stability and dynamic stability of immersion in water,and a smaller freeze-thaw splitting strength ratio and bending tensile strain,bending tensile strength and bending stiffness modulus,which indicates that under the same grade and optimal asphalt content,the increase of RAP content will improve the high temperature performance of recycled asphalt mixture,and reduce the water stability and low temperature crack resistance.Therefore,in the design process of AC-13 recycled asphalt mixture,it is recommended that the RAP content should not exceed 20%,so that the recycled asphalt mixture has better performance.
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