宏观构造特征对水泥混凝土道面抗滑性的影响

Effect of Macro-texture Features on Anti-sliding Characteristics of Cement Concrete Pavement

为获得道面表面构造纹理参数对其抗滑性的影响规律以科学指导道面抗滑性设计和施工,基于水泥混凝土道面表面宏观构造、粗观构造和细观构造对抗滑性影响因素和摩阻机理的分析,探讨了道面宏观构造对胎面所产生的变形摩擦力分量、表层微细构造尖端对胎面微切削摩擦力的力学行为,提出了基于道面纹理间距、纹理凸体棱角坡度、纹理凹陷深度和宽度等构造参数的摩擦因数分析模型。基于弹性包络理论,分析了纹理间距、凸体棱角坡度、凹陷深度和宽度等参数对轮胎变形摩阻和微切削摩阻的影响规律,并分别对不同纹理间距、凸体棱角坡度和凹陷深度的水泥混凝土道面试件进行了实验室试验。结果表明：凹陷深度在2-6mm之间增大时,其抗滑性均显著增大;但当凹陷深度超过4mm后,间距较密（小于20mm）的纹理凸体棱角坡度对抗滑性影响很小;而间距较疏（大于25mm）的纹理凸体棱角坡度对抗滑性影响显著,且其抗滑性随凹陷深度增大显著,因此,在纹理较稀疏的道面上有必要加深凹陷深度,而较密纹理的道面上加深凹陷深度则无意义;纹理凸体棱角坡度的钝化对抗滑性影响的规律显著,但当凸体棱角坡度被磨损钝化到45°后,纹理间距几乎不再影响其抗滑性,因此,对于容易磨损钝化的道面,当纹理间距小于20mm时,再加密纹理难以增大其摩阻性。

In order to obtain the effect laws of pavement surface texture parameters on its antisliding performance so as to scientifically guide the anti-sliding design and construction of the pavement,the deformed friction component to tire caused by pavement macro-texture and the mechanical behavior of micro-cutting friction caused by the tip of pavement surface micro-texture to tire were discussed based on the analyses of the influence factors of the macro-texture,coarsetexture and micro-texture of the cement concrete pavement on the anti-sliding friction mechanism.The friction coefficient analysis model concerning pavement texture spacing,texture convex edge angle,texture depth,and texture groove width and other parameters was presented.Based on the elastic envelope theory,the influence laws of parameters including texture spacing,convex edge angle,texture depth,groove width on the deformed friction andmicro-cutting friction were analyzed,and laboratory test was carried out for the specimens with different texture spacings,texture convex edge angles and texture depths.The results show that the anti-sliding performance is significantly increased as texture depth increases within the range of 2-6mm;however,when the texture depth is deeper than 4 mm,the convex edge angle has little impact on anti-sliding performance when the texture spacing is less than 20mm;but when the texture spacing is larger than 25 mm,the convex edge angle has significant influence on antisliding performance,and the friction increases with the increase of texture depth.Therefore texture depth needs to be increased for the loose texture pavement,while the increment of the texture depth has no effect when the texture spacing is close.The decrement of texture convex edge angle has significant influence on the anti-sliding performance.Nonetheless,when the texture convex edge angle is abraded to less than 45°,there is almost no effect of texture spacing on the anti-sliding performance.So for the pavement which is easy to be worn out,the friction can hardly be enhanced by decreasing the texture spacing,when the texture spacing is less than20 mm.