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Capillary flow characteristics of an autogenic and autonomic healing agent for self-healing concrete

Gardner, Diane, Herbert, Daniel, Jayaprakash, Monica, Jefferson, Anthony and Paul, Alison 2017. Capillary flow characteristics of an autogenic and autonomic healing agent for self-healing concrete. Journal of Materials in Civil Engineering 29 (11) , pp. 171-184. 10.1061/(ASCE)MT.1943-5533.0002092

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Abstract

Capillary flow through discrete cracks is the main mechanism by which healing agents embedded within cementitious matrices travel to zones of damage to afford the host matrix a healing ability. However, the nature of the interaction between the healing agents in their fluid state and the host matrix is unknown and may limit the ability to predict the behaviour and efficacy of self-healing systems. This study considers the capillary flow characteristics of a low viscosity cyanoacrylate and Ground Granulated Blast Furnace slag in a water suspension using glass capillaries and channels formed from a range of concrete mixes. Both healing agents conformed closely to Poiseuille’s law and experienced increases in viscosity over the 40 minute period that they were exposed to a cementitious environment. Numerical simulations of the capillary rise response of the healing agents in a discrete crack confirmed that the rate of damage and degree of saturation of the concrete element will have a significant influence on the choice of healing agent in the design of self-healing systems.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Engineering
Publisher: American Society of Civil Engineers
ISSN: 0899-1561
Funders: EPSRC
Date of First Compliant Deposit: 18 July 2017
Date of Acceptance: 1 June 2017
Last Modified: 10 Mar 2020 13:55
URI: http://orca-mwe.cf.ac.uk/id/eprint/102260

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