基于X-CT技术的沥青混合料三维数值化试样重建

为了对沥青混合料内部结构进行三维重构,采用德国Compact-225型工业X-CT扫描混合料试件,实现试件的三维可视化,计算出集料、砂胶、空隙的体积组成。采用自行编写的程序,实现了由三维可视化模型向三维数值化模型的转化。提出了边界空隙率的概念,通过设置一定的边界空隙率,使模型的边界空隙分布符合实际试样的空隙分布。建立了基于实际试样真实内部微细观分布的数值化试样,弥补了传统的数值方法采用统计学原理或采用对试件损伤研磨建立三维细观模型的不足,为数值化测试奠定了重要基础。

Reconstruction of 3D Digital Specimen of Asphalt Mixture Based on X-CT Technology

In order to reconstruct internal 3D structure of asphalt mixture, first, the specimen of asphalt mixture was scanned by using German Compact-225 type industrial X-ray computerized tomography (X-CT) to achieve the 3D visualization of the specimen for calculating the volume ratios of  aggregates, mastics and voids respectively. With self-written program, the 3D visualization model was transformed to 3D numerical model successfully. Second, the model boundary porosity was proposed and set in accordance with real specimen void distribution. At last, the digital specimen based on the real microstructure distribution of actual specimens was made. This method could make up the shortage of traditional digital method based on statistics theory or 3D micromechanical damage model and lay the foundation for digital test.