基于微观形貌的积沙沥青路面抗滑性能研究

Due to the special geographical and climatic conditions, long-term depositing sand pavement is very common in desert highway .If Slight depositing sand, the Skid resistance of pavement will decrease dramatically. With the increasing of the number of car loading, the degradation of depositing sand pavement appears different attenuation law out of pavement that not depositing sand, which seriously affected the use performance of desert road, reducing the running safety of vehicles.. The project Based on the realistic background that desert highway depositing sand, Based on Micro-texture, Study on the correlation between micro-Texture of Asphalt pavement that depositing sand and skid resistance index. Discuss the Change Regularity of Skid Resistance Degradation ,in Coupling factors, such as depositing sand level, different pavement types, wheel-pressure,and so on. This project will explore the nature that Lack of skid resistance performance of Asphalt pavement of depositing,To reveal its attenuation law, offer the decision basis for road maintenance, design and construction departments. So, This project has the important practical significance.

由于特殊的地理、气候条件，路面长期积沙在沙漠公路中十分普遍。路面出现轻微积沙，路面抗滑能力就会急剧降低。随着汽车荷载作用次数的增加，积沙路面抗滑性能呈现出与非积沙路面不同的衰减规律，严重影响了沙漠公路的使用性能，降低了车辆行驶的安全性。. 本项目以沙漠公路路面积沙为现实背景，基于路面微观形貌的视角，研究积沙路面微观形貌与抗滑性指标的相关性，探寻积沙沥青路面抗滑性能在路面积沙程度、路面结构类型，荷重等多因素耦合作用下的的衰变规律。. 本项目将探寻积沙沥青路面抗滑性能不足的本质，揭示其衰减规律，为道路养护、设计和施工等部门提供决策依据，具有重要的现实意义。

本项目以沙漠地区积沙沥青路面抗滑性能调查结果为基础，提出了积沙沥青路面微观抗滑性评价指标，阐明了路面积沙程度、路面结构类型和荷载对积沙沥青路面抗滑性能的影响规律，揭示了风积沙对沙漠地区沥青路面抗滑性能的破坏机理，为道路养护、设计和施工等提供理论指导依据，具有重要的现实意义。.研究结果表明，风积沙对沥青路面的抗滑性能具有显著的影响，沥青路面的抗滑性能随着路表积沙程度的增加，呈现急剧的下降趋势，加速磨耗实验结果显示，风积沙对集料的表面抵抗轮胎磨光作用能力具有显著影响，加速磨耗后，集料磨光值的衰减程度随着路表积沙的增加而不断增加。.本项目同时也研究了风积沙对不同类型的沥青路面抗滑性能的影响，研究结果表明风积沙对AC-13沥青路面抗滑性能的影响超过其对SMA-13沥青路面抗滑性能的影响，因此推荐在积沙程度严重的地区，沥青路面的上面层宜采用SMA进行铺装。.CT和SEM表征结果表明积沙和车辆荷载循环作用下，集料颗粒表面原有的相对凸出纹理构造在与风积沙颗粒相互摩擦的过程被磨平，构造深度总量减少，集料颗粒表面构造深度变浅，宏观上的表现则为沥青路面中的粗集料变得圆润，磨光值急剧下降，宏观构造深度急剧减小，沥青路面的抗滑性能严重衰减。