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Towards Improved Understanding of Damage and Fracture of High-Performance Cementitious Materials by Development of Mesoscale Analysis Capabilities: 3-D Microstructure Reconstruction and FE Simulations

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Technical Report,30 Nov 2015,29 Sep 2018

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Universidade do Minho Braga Portugal

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Starting from a set of images obtained from micro-computer tomography of a sample of concrete, several numerical tools were developed in order to implement the following steps in image processing denoising, smoothing and segmentation, in order to obtain a 3D segmentation with separated phases, i.e. to distinguish between matrix, aggregated and voids. This segmented information was then used to generate geometrically accurate finite elements FE meshes of the whole domain and of some preselected representative volume elements RVE to be used in the numerical simulations of concrete loading tests. A new constitutive and damage coupled model is proposed and implemented in a finite element solver and, with an initial set of constitutive and damage parameters identified based on literature data, RVEs were used to run numerical simulations of well-known tests HC, UXC, TXC commonly used to characterize cementious materials.

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