高温后混凝土裂纹萌生及演变细观规律试验

Crack and Evolution Rule in High Temperature Concrete by Experiment

火灾高温作用对混凝土的性能有很大影响,采用先进的实验技术研究经历高温后的混凝土力学特性对灾后混凝土结构的修复有重要意义。本文将实时激光全息干涉试验系统与静态承压装置相结合,在单轴连续静态荷载作用下分别对不同高温处理后混凝土试块动态测试。根据试验获得的干涉条纹的分布规律及其路径,直观地再现了混凝土的损伤演化过程,描述了混凝土构件的损伤演化断裂特征,为高温后混凝土结构破坏分析与缺陷诊断探索出了有效的试验方法。

The properties of concrete are greatly influenced by high temperature.Therefore,it is important to study properties of concrete after high temperature for repairing of concrete structure with advanced experiment technology.An experimental system of real time laser holographic interferometry under static load was made by use of laser experiment system.This system was applied to test concrete samples after different high temperature under uniaxially consecutive compression.Properties of concrete damage and failure development were visually shown with principles of laser holographic interference and the formation of holographic interference fringes.Effective experimental method was provided for analysis and diagnosis of damage in high concrete construction.