Print Email Facebook Twitter Experimentally informed micromechanical modelling of cement paste Title Experimentally informed micromechanical modelling of cement paste: An approach coupling X-ray computed tomography and statistical nanoindentation Author Zhang, H. (TU Delft Materials and Environment) Šavija, B. (TU Delft Materials and Environment) Lukovic, M. (TU Delft Concrete Structures) Schlangen, E. (TU Delft Materials and Environment) Date 2019-01-15 Abstract This work proposes a method for numerically investigating the fracture mechanism of cement paste at the microscale based on X-ray computed tomography and nanoindentation. For this purpose, greyscale level based digital microstructure was generated by X-ray microcomputed tomography with a resolution of 2 μm/voxel length. In addition, statistics based micromechanical properties (i.e. Young's modulus and hardness) were derived from the grid nanoindentation test which was set to have an interaction volume the same as the resolution of the digital microstructure. A linear relationship between the two probability density functions of greyscale level and local Young's modulus was assumed and verified by the two-sample Kolmogorov-Smirnov (K–S) statistic. Based on this assumption, the fracture and deformation of a digital cubic volume with a dimension of 100 μm under uniaxial tension was simulated using a lattice fracture model. In addition, the influence of heterogeneity on fracture response was studied. Furthermore, the proposed method was compared with the results obtained from a traditional approach used previously by the authors in which discrete phases (capillary pore, anhydrous cement clinker, outer and inner hydration products) were considered. The two methods show similar crack patterns and stress-strain responses. The proposed method is regarded more promising as it captures also the gradient of material properties (within the discrete phases) in the cement paste. To reference this document use: http://resolver.tudelft.nl/uuid:2b36bb9f-b4e3-4585-8ef0-2631e7a4f74a DOI https://doi.org/10.1016/j.compositesb.2018.08.102 Embargo date 2019-02-27 ISSN 1359-8368 Source Composites Part B: Engineering, 157, 109-122 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2019 H. Zhang, B. Šavija, M. Lukovic, E. Schlangen Files PDF 1_s2.0_S1359836818315087_main.pdf 7.72 MB Close viewer /islandora/object/uuid:2b36bb9f-b4e3-4585-8ef0-2631e7a4f74a/datastream/OBJ/view