基于自洽法的电化学沉积修复饱和混凝土细观描述

针对当前电化学沉积修复混凝土缺乏细观层次上的理论描述,首先,以饱和混凝土的细观结构和电化学沉积修复的主要机理为基础, 提出了含电化学沉积产物、水和混凝土基体在内的三相复合材料细观力学模型. 其次,为了从细观层次定量描述电化学沉积修复对混凝土宏观性能的影响,基于自洽法对上述细观力学模型进行多层次均匀化处理,获取电化学沉积修复饱和混凝土的有效性能,其中,第一层均匀化是采用广义自洽模型获取等效夹杂的有效性能,第二层均匀化是采用自洽方法和沃伊特(Voigt) 上限相结合的方式获取修复混凝土的有效性能. 最后,为了验证该文所提出模型和方法的有效性,对比了该文的预测结果、试验数据和已有模型,结果表明了该文模型和方法是合理的.

MICRO-SCALE DESCRIPTION OF THE SATURATED CONCRETE REPAIRED BY ELECTROCHEMICAL DEPOSITION METHOD BASED ON SELF-CONSISTENT METHOD

Since there are few theoretical models to describe the healing process of electrochemical deposition method at the micro-scale level, a three-phase micromechanical model, which is made up of the deposition products, water and intrinsic concrete, for the healed saturated concrete is presented based on the material's microstructure and the healing mechanism. To quantitatively describe the influence of the deposition products on the macro-scale properties of the concrete, multi-level homogenization scheme is presented to obtain the effective properties of the saturated concrete repaired by electrochemical deposition method based on the self-consistent method. Specifically, the properties of the equivalent inclusion are calculated by the general self-consistent model in the first level homogenization. In the second level homogenization, the self-consistent method combined with the Voigt upper bound is utilized to obtain the properties of the repaired concrete. To verify the correctness of micromechanical framework, the predicting results are compared with the experimental data and those from the existing models, which show that the proposed model and homogenization methods are reasonable and acceptable.