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A coupled chemo-mechanical damage-healing model for cementitious materials

Jefferson, A.D. and Davies, R.E. 2018. A coupled chemo-mechanical damage-healing model for cementitious materials. Presented at: EURO-C 2018: Computational Modelling of Concrete and Concrete Structures, Bad Hofgastein, Austria, 26 February-1 March 2018. Published in: Meshke, Gunther, Pichler, Bernhard and Rots, Jan G. eds. Computational Modelling of Concrete Structures: Proceedings of the Conference on Computational Modelling of Concrete and Concrete Structures (EURO-C 2018), February 26 - March 1, 2018, Bad Hofgastein, Austria. London: CRC Press, pp. 285-288. 10.1201/9781315182964-35

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Abstract

A model is described for representing simultaneous damage and healing behaviour in cementitious structural elements that contain embedded autonomic healing systems. The model uses a crack-healing cohesive zone formulation in which damaged and healed proportions of the cohesive zone can both grow and diminish, with no restrictions placed on the number or timing of these damage-healing events. The cohesive zone sub-model is implemented in a finite element with strong discontinuity and is coupled to both capillary flow and chemical curing model components. The flow model simulates the transport of healing agents within discrete cracks as well as through micro-cracked regions within the fracture process zone. An important aspect of the damage-healing component of the model is the way that permanent strains are computed so as to satisfy the second law of thermodynamics. This is accomplished with the assumption that the stress in a component of healing agent is zero at the moment of solidification, which applies to both null and non-zero displacement fields. The new coupled model is assessed using some recent data obtained from a number of experiments undertaken at Cardiff University. These tests were conducted on both reinforced and unreinforced specimens, and encompass a range of cracking scenarios. The paper shows that the model accurately predicts the flow of healing agents within discrete cracks and that it is able to represent the mechanical behaviour associated with multiple and simultaneous damage-healing events with good accuracy.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: CRC Press
ISBN: 9781315182964
Last Modified: 15 Aug 2019 10:03
URI: http://orca.cf.ac.uk/id/eprint/121162

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