CT Real-Time Observation of Meso-Damage Process for Concrete Material under Uniaxial Compression
混凝土单轴压缩下细观损伤特性的CT研究

Concrete is a heterogeneous material and may be considered as three-phase composites consisting of aggregate, mortar and interface between aggregate and mortar. Real time scanning observation on the evolution of meso-damage in concrete was carried out by means of CT technology, and the real time scanning CT image of static compression was obtained. The CT image data were collected and a statistical damage variable based on CT number was defined according to the divisional zones theory. Analysis of concrete CT image, CT data and damage variable under static compression shows that concrete specimen has experienced different stages of condense, expansion of volume, crack rapid propagation and failure, therefore the characteristics of concrete meso-damage evolution is reflected. Through the meso-damage evolution, the process of crack propagation, coalescence and failure in concrete material is explored instructively.