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首页> 外文OA文献 >Micromechanical Modeling for Material Design of Durable Infrastructural Materials: The Influence of Aggregate and Matrix Modification on Elastic Behavior of Mortars
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Micromechanical Modeling for Material Design of Durable Infrastructural Materials: The Influence of Aggregate and Matrix Modification on Elastic Behavior of Mortars

机译：耐用基础设施材料设计的微机械建模：骨料和基体改性对砂浆弹性行为的影响

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摘要

This paper reports the fundamental difference in microstress distributions in traditional hardened cement paste with quartz inclusions and a cement paste with lightweight aggregate (LWA) inclusions using microstructurebased numerical simulation involving finite element method with periodic boundary conditions. Variation of relative stress distributions under varying component material properties and varying microstructural features in both the systems is elucidated for a comprehensive understanding. The presented microstructure-based numerical technique accurately captures the stress concentrations inside microheterogeneous systems, which is otherwise not detectible using analytical homogenization schemes. Numerical simulations reveal that strengthening and stiffening of matrix and interfacial transition zone (ITZ) with silica fume incorporation as cement replacement in LWA incorporated cementitious systems has a detrimental effect in terms of overall strength of the material, contrary to traditional quartz-based cement mortar system. Proper selection of stiffness and strength of LWA inclusions is critical towards performance of such materials. This paper links the microstructure with mechanical behavior of two different microheterogeneous materials and provides valuable input towards material design of such non-traditional cementitious systems with different inclusions.
机译：本文采用基于微观结构的数值模拟方法，包括周期边界条件，利用数值模拟方法，报告了传统的带有石英夹杂物的硬化水泥浆和带有轻质骨料（LWA）夹杂物的水泥浆的微应力分布的根本差异。为了全面理解，阐明了两种系统中变化的组件材料属性和变化的微结构特征下的相对应力分布变化。提出的基于微结构的数值技术可以准确地捕获微异质系统内部的应力集中，否则使用分析均质方案无法检测到。数值模拟表明，掺入硅粉作为LWA掺入胶凝体系中水泥的替代品，基质和界面过渡区（ITZ）的增强和硬化对材料的整体强度有不利影响，这与传统的石英基水泥砂浆体系相反。正确选择LWA夹杂物的刚度和强度对于此类材料的性能至关重要。本文将两种不同的微非均质材料的微观结构与力学行为联系起来，并为这种包含不同夹杂物的非传统胶凝体系的材料设计提供了有价值的信息。

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