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| 摘要: |
| 提出了硬化水泥石弹性模量预测的分级模拟方法.根据水泥石中各组分的几何尺度,将硬化水泥石结构分为两级:第一级由C-S-H和CH组成,第二级由水化凝胶、未水化水泥和毛细孔组成.应用两相复合材料弹性模量的精确解求得低密度、高密度水化凝胶的弹性模量.将三相复合球模型分解成2个两相复合球模型,逐步计算实心、硬化水泥石的弹性模量.分级模拟方法的优点在于以定量的方式将硬化水泥石弹性模量与各组分的体积分数和弹性模量联系起来,为硬化水泥石优化设计提供了理论依据.最后,通过与文献中的实验结果进行比较,初步验证了分级模拟方法的有效性. |
| 关键词: 分级模拟方法,硬化水泥石,弹性模量,广义自洽模型 |
| DOI： |
| 分类号:TU528.01 |
| 基金项目:国家自然科学基金 |
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| Multi-level Simulation Method for Predicting Elastic Moduli of Hardened Cement Paste |
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ZHENG Jian-jun L Jian-ping XING Hong-yan
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| Abstract: |
| A multi-level simulation method is presented for predicting the elastic moduli of hardened cement paste.Based on the geometrical scales of the constituents in cement paste,the structure of the hardened cement paste is broken down into two levels.At the first level C-S-H and CH are involved,whereas at the second level hydrated gel,unhydrated cement and capillary pores are all included.By applying the exact solution for the elastic moduli of two-phase composite materials,the elastic moduli of low-density and high-density gels are obtained.By breaking down the three-phase composite sphere model into two two-phase composite sphere models,the elastic moduli of solid and hardened cement pastes are then computed step by step.The advantage of the proposed method is that the elastic moduli of hardened cement paste are related to the volume fractions and elastic moduli of the constituents in a quantitative manner,which lays a theoretical foundation for optimization design of cement paste.Finally,the validity of the method presented in this paper is preliminarily verified with experimental results reported in the literature. |
| Key words: multi-level simulation method,hardened cement paste,elastic modulus,generalized self-consistent model |
