超黏精薄层罩面沥青混合料性能研究

Study on performance of super viscous fine thin-layer overlay asphalt mixture

为解决传统薄层罩面水稳定性差、易开裂等性能方面的问题,提高薄层罩面的使用寿命及服务水平,在传统薄层罩面技术的基础上进行改进,研发出一种超黏精的罩面结构类型。对超黏精罩面所用的超黏韧沥青、NovaBinder、高黏沥青M进行试验,结果显示:超黏韧沥青的整体性能优于另外两种高黏沥青。在AC密级配、OGFC开级配基础上进行半开级配的超黏精罩面矿料级配设计,然后对超黏精罩面、市场上某超薄磨耗层及NovaChip B进行高温抗车辙、低温抗开裂、抗水损害、飞散、析漏、抗滑及排水性能试验研究,结果显示:在不同试验温度下,超黏精罩面的高温抗车辙能力均最优,同时超黏精罩面较另外两种薄层罩面表现出更好的低温抗开裂、抗水损害、抗荷载冲击及施工和易性等性能,且超黏精罩面的抗滑及排水性能也满足要求。

In order to solve the performance problem of traditional thin-layer overlay such as the poor water stability and easy cracking,and improve the service life and service level of thin-layer overlay,the traditional thin-layer overlay technology was improved,and a super viscous fine overlay structure was developed.The test results of the super viscous tough asphalt,NovaBinder and high viscous asphalt M used in the super viscous fine overlay show that the overall performance of super viscous tough asphalt is better than the other two kinds of high viscous asphalt.On the basis of AC dense gradation and OGFC open gradation,the semi open gradation of super viscous fine overlay was designed.Then the performance of high-temperature rutting resistance,low temperature cracking resistance,water damage resistance,dispersion,leakage,sliding resistance and drainage of super viscous fine overlay,a super thin wearing course in the market and NovaChip B were studied experimentally.The results show that the performance of the high-temperature rutting resistance of super viscous fine overlay is the best at different test temperatures.At the same time,compared with the other two kinds of thin-layer overlays,the super viscous fine overlay has better performance of low-temperature cracking resistance,water damage resistance,load impact resistance and construction workability,and it's performance of sliding resistance and drainage also meets the requirements.