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Numerical Study on the Influence of Aggregate Size on Skid Resistance Performance of Porous Pavements

机译：骨料粒径对多孔路面抗滑性能影响的数值研究

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Porous pavements are often used as a means to improve skid resistance during wet weather. During the design and construction phases, porosity is often used as the single parameter representing porous pavement drainage capacity. However, it is insufficient to use this parameter to predict frictional performance on porous pavements because pavement mix with different aggregate sizes and yet having identical porosity values can yield significantly different skid resistance behaviors. This paper presents a numerical framework to analyze the influence of aggregate size on porous pavement skid resistance. It was found that despite having identical porosity, pavement mix with larger aggregates can provide higher permeability value, which consequently reduces the water film thickness on the pavement surface under a given rainfall intensity and relieves the hydrodynamic pressure buildup underneath the tire. Porous pavements constructed with larger-size aggregates for a given porosity are found to exhibit better skid resistance performance.
机译：多孔路面经常被用作在潮湿天气中提高抗滑性的一种手段。在设计和施工阶段，孔隙率通常用作代表多孔路面排水能力的单个参数。但是，使用该参数来预测多孔路面的摩擦性能是不够的，因为具有不同集料尺寸但具有相同孔隙率值的路面混合物会产生明显不同的防滑性能。本文提出了一个数值框架来分析骨料尺寸对多孔路面防滑性能的影响。结果发现，尽管孔隙率相同，但具有较大集料的路面混合物可提供较高的渗透率值，从而在给定的降雨强度下减小路面表面的水膜厚度，并减轻轮胎下方的水动力压力累积。对于给定的孔隙率，用较大尺寸的骨料构造的多孔路面发现具有更好的防滑性能。

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