水泥基材料强度影响因素:分析与综述

Factors Affecting the Strength of Cement-Based Materials:Analyses and Review

材料的强度是受气孔率、弹性模量、断裂能和临界缺陷尺寸控制的。气孔率对材料的弹性模量、断裂能和临界裂纹尺寸都有影响，高效水泥基材料必须具有低气孔率和致密的显微结构，其途径一般通过组成改性增强、颗粒堆积技术、聚合物浸渍及纤维增强来实现，并利用高能混合来保证材料的均匀性，降低非本征缺陷。高效能水泥基材料一般是一种多相复合材料，要实现复合材料的优点须控制水泥浆体／集料／纤维之间的界面结合状态，改善显微结构。

Abstract The strength of materials are controlled by porosity,modulus of elasticity,fracture energy and critical flaw sizes.Porosity has influences on the modulus,fracture energy and critical flaw sizes of materials.High performance cement-based meterials must have low porosity and dense microstructure.These are usually achieved by composition modification,grain packing,polymer impregnation and fiber reinforcement.In general,a high performance cement-based material is a multiphase composite material.To achieve the advantages of such composite materials,the bonding conditions at the interface of cement/aggregate/fibers must be controlled and the microstructure be improved so as to increase the modulus of elasticity and fracture energy