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Numerical modeling of micro-indentation tests in Portland cement paste, using finite elements with fracture-based zero-thickness interfaces



Author(s): J. Liaudat, D. Garolera, C.M. López, I. Carol
Paper category: Conference
Book title: 2nd International conference on Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. Van Breugel, Wei Sun, Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Pages: 910 - 917
Total Pages: 7
Language: English


Abstract: 
The mechanical behavior of ordinary Portland cement paste is represented using a numerical model based on the finite element method, with the distinctive features of representing explicitly the first-level heterogeneities and using fracture-based zero-thickness interface elements to model cracks. The model, previously applied to micromechanical analysis of heterogeneous materials such as concrete or mortar, is used to analyze a microindentation test with spherical indenter. Preliminary results in 2D have been obtained for cement paste images reported by NIST, from which a first geometric representation in two phases has been developed. The results obtained show the development of the cracks with the indenter penetration, with reasonable failure patterns and load-displacement curves, while at the same time (and with the same parameters) also representing adequately compression and tension failures. These results are considered very promising in the context of an on-going research line aimed at using numerical models in combination with indentation tests, in order to characterize not only elasticity but also strength and fracture-based parameters of cementitious materials in the small scale.


Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00