The cold patching plant asphalt mixture was prepared by using plant asphalt instead of petroleum asphalt.The penetration(high-temperature),low-temperature flexural tensile strength,water permeability coefficient and freeze-thaw splitting tensile strength ratio of cold patching plant asphalt mixture were calculated under different asphalt-aggregate ratios,and the best asphalt-aggregate ratio was obtained.The cold patching plant asphalt mixture was prepared with 6.5%asphalt-aggregate ratio,and the pulverization of waterproof protective layer of ballastless track in cold region was rectified,and its remediation effect was tested.The results show that with the increase of asphalt-aggregate ratio,the penetration of cold patch planting asphalt mixture increases gradually and the increase amplitude is not significant,the low temperature flexural tensile strength increases first and then decreases,the water permeability coefficient decreases gradually,and the freeze-thaw splitting strength ratio increases gradually.When the asphalt-aggregate ratio was 6.5%,the comprehensive performance of cold patching plant asphalt mixture was the best in high temperature deformation resistance,low temperature splitting resistance,anti-seepage and water stability.After rectification,the waterproof protective layer of the asphalt mixture is flat and dense,and the horizontal and vertical drainage slopes meet the requirements.The drainage is smooth,and the cold patching plant asphalt mixture has good application effects.
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