水泥基体结构异质性多重分形分析与模拟  

Multifractal Analysis and Modeling of Structural Heterogeneity in Cement Paste

作　　者：蒋燕伟 奚亚男 

机构地区：[1]中铁四局集团有限公司,安徽 合肥 [2]河海大学力学与材料学院,江苏 南京

出　　处：《土木工程》2022年第9期1037-1045,共9页Hans Journal of Civil Engineering

摘　　要：水泥基体由具有不规则几何形貌的组分无序堆积而成,在空间维度上呈现出典型的结构异质性。本文以不同养护龄期(7 d, 28 d)的普通硅酸盐水泥净浆为例,基于X射线计算机断层扫描(X–ray Computed Tomography, XCT)技术获取其三维灰度图像。针对水泥基体的三维结构,以局部孔隙率为指标开展多重分形分析。结果表明,多重分形分析对于定量描述水泥基体结构异质性具有很好的适用性。此外,本文提出利用一般化二项迭代方法模拟水泥基体的结构异质性。Cement paste is comprised of anhydrous clinkers and hydrates of irregular morphology, which manifests an intrinsic structural heterogeneity in spatial domain. Taking ordinary Portland cement paste cured at 7 d and 28 d into account, we use the X-ray Computed Tomography (XCT) to acquire their 3-dimensional structural features. With the 3-dimensional XCT images as input, the multifractal analysis is performed based on a definition of local porosity. Results indicate that the multifractal analysis shows a good applicability in quantification of the structural heterogeneity in cement paste. Besides that, a generalized binomial multiplicative cascade is introduced to model the multifractal structural heterogeneity.

关 键 词：水泥基体 结构异质性 X射线计算机断层扫描 多重分形分析 一般化二项迭代方法 

分 类 号：TU528[建筑科学—建筑技术科学]