Microscopic pore structure characteristics and compressive damage evolution of autoclaved aerated concrete
WANG Xiaobing
ZHANG Chuanda
LIU Xuyang
GAN Yuannan
JIANG Shanping
Abstract：Three kinds of autoclaved aerated concrete(AAC)with different densities were designed to analyse the internal pore distribution by CT scanning test,and combined with digital image correlation(DIC)method to study the damage evolution law of AAC under uniaxial compression.The results show that,AAC contains more connected pores inside,and with the increase of pore radius,the pore size distribution shows the trend of decreasing,then increasing,then decreasing;with the increase of density,the porosity and the number of pores decrease,and the average pore radius increases;the pore distribution of high-density AAC is more uniform,and the structure is simpler and more regular.Based on the axial compression test data,the stress-strain constitutive relationship was established to predict the mechanical properties of AAC under uniaxial compressive loading.The surface crack ex-tension patterns of AAC with different densities were roughly the same,with axial crack penetration dominating and damage eventu-ally occurring along the loading direction.
Keywords：autoclaved aerated concreteCTdigital image correlationpore structuredamage evolutionconstitutive relationship
Publication Date：2025-02-24
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 74-78 )