Localized Damage Analysis of Cement Mortar Using X-ray Computed Tomography In Situ Compressive Loading and Digital Volume Correlation

In this study, X-ray computed tomography (X-ray CT) in situ compressive loading was used, combination with digital volume correlation (DVC), to analyze the localized damage behavior of cement mortar, cracking process, microstructural changes, and strain distribution. By using CT, it possible identify three-dimensional structure two-dimensional internal morphology compressed mortar. The development significantly influenced by unhydrated cement. Cracks material did not always expand an increasing load, formation new cracks made old ones become extruded. After conducting a DVC calculation, found that procedure contained bias. bias during non-homogeneity can cause uneven maximum principal strains are all tensile, causing tensile damage. To reflect inside specimen, gray value CT image index determined primary were used. A localization factor introduced characterize failure process three dimensions. occurred earlier than on surface, develops from out, according results image’s value, index, factor. which may be caused phenomenon compression load or pressure. order reach reliable conclusion, more research is required.