《Journal of Materials in Civil Engineering》杂志刊登“目前发展水平：沥青混凝土的渗透性”

作  者：P. J. Vardanega

刊  物：《Journal of Materials Engineering》，2012年12月3日印刷

摘  要：有关热混合沥青混凝土的渗透性的研究结果在最新的有关沥青混凝土渗透性的度量和解释中有详细的介绍。通过回顾大量热混合沥青混凝土渗透性的文献得到了关于混合沥青混凝土渗透性数据和详细的研究现状与技术报告。沥青混凝土的渗透性受很多因素的影响，这些因素的影响程度不同，但均反映在对渗透系数的影响上。目前已经有许多理论，经验，半经验和数值模型利用一系列指标来预测渗透系数。本文回顾了部分模型，并讨论了它们的优缺点，同时总结了X射线断层摄影术的最新进展，尽管现场渗透性测量与实验室测量具有一定的相关性，但是未见其在数值上相匹配的文献发表。目前渗透性的测试方法是基于层流的假设，而在多孔混合物中不成立。其通过尝试测量连通的孔隙来得出渗透性与孔隙率之间更有意义的相关关系，而并不考虑两个量之间的数学模型。相对于孔隙率和颗粒级配的变化，浇筑层厚度与公称最大集料粒径之比和胶凝材料含量的变化对渗透性的影响较小。其中碾压沥青混凝土中孔隙梯度和分布可以用X射线法来评估，实验室制备的试样中的孔隙呈现不均匀分布。

State of the Art: Permeability of Asphalt Concrete

Authors: P. J. Vardanega

Journal: 《Journal of Materials Engineering》，Published: 03 December 2012

Abstract: The findings of an extensive literature review on the permeability of hot-mix asphalt concrete are detailed in a state of the art report on the measurement and interpretation of asphalt concrete permeability data. The permeability of asphalt concrete is affected by a range of factors with various levels of importance which are reviewed along with their impact on the coefficient of permeability. Many theoretical, empirical, semi-empirical and numerical models have been developed to predict permeability, using a range of indicators. Some of these models are reviewed and their advantages and shortcomings discussed. Recent advances in X-ray tomography studies are also summarised. The review reveals that field permeability measurements are not reported to match numerically well with laboratory measurements: though there is some correlation. The reviewed test methods for permeability all rely on an assumption of laminar flow which is unlikely in more porous mixtures. Attempts to measure connected air voids improves the chances of obtaining more meaningful correlations between permeability and air voids, regardless of the mathematical model used to link the two quantities. The lift-thickness to nominal maximum aggregate size (NMAS) ratio and or changes in the binder content has a less significant effect on permeability than changes in the porosity and/or mix gradation. Air void gradients and distributions in compacted asphalt concrete mixtures can now be assessed with X-ray techniques: the distribution of air voids appears to be non-uniform in laboratory prepared specimens.

原文链接：http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29MT.1943-5533.0000748