多孔沥青混合料的细观空隙特征与影响规律

Microscopic Void Features and Influence of Porous Asphalt Concrete

摘要:

基于CT(computed tomography)、图像处理及重构技术和室内试验分析了多孔沥青混合料细观空隙特征的表征，研究了空隙率、粗细级配和公称最大粒径等对多孔沥青混合料细观特征的影响规律以及细观空隙特征同混合料性能之间的关系.研究结果表明多孔沥青混合料试件断面图像的空隙等效直径、空隙面积、空隙数量、空隙分形特征同混合料的材料组成与性能密切相关；对于空隙率相近的多孔沥青混合料，其细观空隙特征同混合料动稳定度、飞散损失和吸声系数峰值具有良好的回归关系.

Abstract:

X ray computed tomography (CT) images were obtained and analyzed to study microscopic void features of various PAC（porous asphalt concrete）mixtures. Experimental tests were performed to research the influence of air voids, aggregate gradation and nominal maximum aggregate size on the microscopic void features and relationship between microscopic and mixture properties. It is shown by the research results that the void equivalent diameter, void area, void quantity and void distribution of PACs mixture were closely related with the mixture’s material composition and performance. For the PAC with approximate air voids, mixture’s microscopic void features had good regression relationship with dynamic stability, Cantabro loss as well as acoustic absorption peak.