CT and AE Test Research on Concrete Damage Localization

CT scanning test and acoustic emission damage localization test were conducted under uniaxial compression in order to solve the technical problems of damage localization in concrete failure process, in addition to the porosity variation law, 3D meso model of concrete pores and cracks at different loading stages are obtained. A damage variable based on CT images and acoustic emission damage points is created. Research results show that the changes of porosity, pore volume and damage variable are consistent with loading process, the rapid increment of concrete pore volume and damage variable can be a precursor to the failure of concrete;3D reconstruction of concrete images and acoustic emission damage location map was used comprehensively to observe and analyze the whole process of concrete crack development and evolution. A new method for the analysis of concrete crack evolution and localization of the damage was provided from the result.