水泥水化过程的细观力学模型与性能演化  

Micro-mechanical model and property evolution for hydration of cements

作　　者：李春江[1] 杨庆生[1] 

机构地区：[1]北京工业大学工程力学部,北京100022

出　　处：《复合材料学报》2006年第1期117-123,共7页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(10272006;30470439);北京市优秀人才专项(20041A0501517);国家留学回国基金(13100094)

摘　　要：基于水泥水化过程的实验测量数据,建立了一个研究水泥水化过程的细观结构和有效性能演化的细观力学模型。该模型由未水化的水泥颗粒、水泥凝胶和孔洞三相介质组成,并假设细观结构呈周期性均匀分布。随着水化过程的进行,模型中的组份是连续变化的,并与实验测量的组份含量完全一致。利用本文中模型和均匀化方法(直接平均法和二尺度展开法)计算了水泥浆体在各瞬时的杨氏模量和泊松比。研究表明,在水泥的水化过程中,水泥浆体的弹性性能随水化度而变化,其变化规律和精度与现有的实验数据符合很好。该方法可容易地推广到三维情况和其他水化介质。Based on the experiment, a micro-mechanical model is developed to investigate the evolution of the microstructure and effective properties of the cement paste in the hydration of the cement, assuming that the cement paste composite consists of anhydrous cement particles, cement gel and pores in the model. The cement particles have a periodic distribution and are wrapped by the cement gel. The instantaneous Young＇s modulus and Poisson ratio of the cement paste are calculated by the direct average method and two-scale expansion method. A comparison between the numerical results and experimental data shows that this model can simulate the evolution of the microstructure and properties of the cement in the hydration. The present method can be extended to model property evolution of other hydrous media.

关 键 词：水泥 水化 细观结构 性能演化 均匀化方法 

分 类 号：TB332[一般工业技术—材料科学与工程]