Print Email Facebook Twitter Combined experimental and numerical study on micro-cube indentation splitting test of cement paste Title Combined experimental and numerical study on micro-cube indentation splitting test of cement paste Author Zhang, H. (TU Delft Microlab; TU Delft Materials and Environment) Šavija, B. (TU Delft Microlab; TU Delft Materials and Environment) Schlangen, E. (TU Delft Microlab; TU Delft Materials and Environment) Date 2018-01-01 Abstract The aim of this paper is to investigate the fracture performance of cement paste at micro scale by both experimental and numerical methods. Micro cubic specimens with length of 100 µm were fabricated by precision cutting, grinding and micro-dicing, and tested by splitting with a wedge tip mounted on a nano-indenter. A nominal splitting tensile strength was derived from the maximum load of the recorded load-displacement diagram to represent the global fracture performance of the fractured micro-cube. To achieve this, an analogy was made between the micro-cube indentation splitting test and the standard Brazilian splitting test. To cope with the inherent heterogeneity of this material at micro scale, for cement paste with each water/cement (w/c) ratio (0.3, 0.4 and 0.5), more than hundred micro-cube specimens were fabricated, tested and analysed using Weibull statistics. The analysis shows that the splitting tensile strength of cement paste on the micro scale is much higher than on the macroscopic scale but lower than tensile strength of distinct hydrated cement phases measured on micro or nano scale. Furthermore, higher and less scattered values of splitting tensile strength were observed for the specimens with lower w/c ratio. In parallel with the experiments, a micro-structure informed lattice fracture model was adopted to simulate the fracture process of the micro-cube under indentation splitting. The simulated results were compared with the experimental one and have a good consistency in terms of the load-displacement curve and fracture pattern. With the method presented in this paper the framework for validation of the modelling results at micro scale is created. Subject Cement pasteLattice modellingMicro-cube splittingMicromechanicsSplitting tensile strength To reference this document use: http://resolver.tudelft.nl/uuid:36effcd5-3a0e-48f8-89dc-acefab823a53 DOI https://doi.org/10.1016/j.engfracmech.2018.04.018 Embargo date 2018-10-13 ISSN 0013-7944 Source Engineering Fracture Mechanics, 199, 773-786 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 © 2018 H. Zhang, B. Šavija, E. Schlangen Files PDF 1_s2.0_S0013794418301267_main.pdf 4.35 MB Close viewer /islandora/object/uuid:36effcd5-3a0e-48f8-89dc-acefab823a53/datastream/OBJ/view