长江科学院院报2026，Vol.43Issue(1)：155-163,172,10.DOI:10.11988/ckyyb.20241210
基于细观力学的水泥基材料多尺度建模及参数分析
Multi-scale Modeling and Parameter Analysis of Cement-based Materials Based on Micromechanics
摘要
Abstract
[Objective]Current micromechanical models pay limited attention to parameter uncertainty and interac-tions,which makes it difficult for their response results to reflect the dispersed nature of the properties of cement-based materials.Therefore,it is necessary to explore an analysis method that can simultaneously capture the effects of multiple parameters and their interactions on the responses of micromechanical models of cement-based materials.[Methods]To address the discrete distribution of response results in existing micromechanical models and to iden-tify and control the influencing factors causing this phenomenon,a multi-scale micromechanical model of cement-based materials was constructed in this study.Cement-based materials were divided into four scales:calcium silicate hydrate gel,cement paste,cement mortar,and concrete.Considering the mineral composition of cement phases,aggregates,and the ITZ,a multi-scale micromechanical model capable of accounting for the randomness of input parameters was proposed.Meanwhile,probabilistic methods were applied to the constructed micromechanical mod-el,and global sensitivity analysis was employed to quantify the effects of input parameter uncertainty on the elastic modulus of cement-based materials.[Results]The results showed that the proposed model exhibited good applica-bility in simulating the relationship between elastic modulus and hydration degree of cement-based materials across multiple scales and showed good agreement with experimental results.The discreteness of the model response results mainly originated from the cross-scale propagation of input parameter uncertainty,indicating that uncertainty at the concrete scale incorporated the uncertainties of input parameters at the mortar and cement paste scales.The total-or-der sensitivity indices,ranked from largest to smallest,were the elastic modulus of sand and coarse aggregates,the volume fraction of sand and coarse aggregates,the elastic modulus of hydration products,the volume fraction of ce-ment clinker,and the elastic modulus of cement clinker.To identify the dominant sources of uncertainty within the model framework,particular attention should be paid to the elastic modulus of sand and coarse aggregates,whereas the volume fraction and elastic modulus of cement clinker can be regarded as insensitive factors.[Conclusion]Screening the number of input parameters has important practical significance for reducing computational complexity and improving the efficiency of model response analysis.关键词
水泥基材料/细观力学/多尺度/水化产物/弹性模量Key words
cement-based materials/micromechanics/multi-scale/hydration products/elastic modulus分类
建筑与水利引用本文复制引用
吴浪,程文诺,陈纷纷,雷斌..基于细观力学的水泥基材料多尺度建模及参数分析[J].长江科学院院报,2026,43(1):155-163,172,10.基金项目
国家自然科学基金项目(52268043,51968046) （52268043,51968046）
江西省主要学科学术与技术带头人培养计划-领军人才项目(20204BCJ22003) （20204BCJ22003）
