细观分析方法在混凝土物理/力学性质研究方面的应用

Applications of meso-scale analysis methods on the study of the physical/mechanical properties of concrete

混凝土是典型的准脆性复合材料,其物理及力学性质取决于两种主要组成材料,即粗骨料和硬化水泥砂浆以及两者间的粘结作用。简言之,需要从其微/细观角度来把握混凝土材料的宏观物理及力学性质。本文阐述和讨论了细观尺度分析方法在混凝土静、动态力学性能及破坏机制,混凝土材料及钢筋混凝土构件层次的尺寸效应,以及氯盐环境下混凝土应力腐蚀行为(包括:氯离子传输行为及钢筋锈胀引发的保护层断裂破坏行为)数值研究方面的应用进展。最后对其未来发展的一些方向和有待进一步研究的问题作了总结。

Concrete is a typical pseudo-brittle composite material,whose physical and mechanical properties are determined by the two major ingredients involving coarse aggregates and hardened cement mortar,and the bonding effects of the two components. Accordingly,to describe the physical and mechanical properties of concrete,the micro-/meso-scale analysis methods should be employed. Herein,the applications of meso-scale analysis methods were illustrated and discussed on the studies of the static/dynamic mechanical properties and failure mechanism of concrete,the size effects of concrete materials and reinforced concrete members,and the stress corrosion of concrete under chloride environment（including the chloride diffusivity,and the fracture of cover concrete induced by corrosion-expansion of reinforcing bar）. Finally,some suggestions were provided for future development and studies.