A coupled thermo-hygro-chemical model for characterising autogenous healing in ordinary cementitious materials

Chitez, Adriana Silviana ORCID: https://orcid.org/0000-0002-8673-5432 and Jefferson, Anthony Duncan ORCID: https://orcid.org/0000-0002-2050-2521 2016. A coupled thermo-hygro-chemical model for characterising autogenous healing in ordinary cementitious materials. Cement and Concrete Research 88 , pp. 184-197. 10.1016/j.cemconres.2016.07.002

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Abstract

Experimental work has demonstrated that cracks can be healed in ordinary cementitious materials in the presence of water. The primary healing mechanisms are hydration of the unreacted nuclei of cement particles and the long-term formation of calcite. A mathematical model for simulating early-age autogenous healing of ordinary cement-based materials is proposed, which employs a coupled thermo-hygro-chemical (THC) framework andwhich uses a reactive water transport component to predict themovement of healingmaterials. A single concentration variable is employed for the healing component of themodel that is derived directly fromthe quantity of unreacted cement and computed using a generalised cement hydration model component. The hydration component is directly linked to an expression for capillary porosity and for the porosity of the material within a healed crack. The results from a series of model simulations are in good general agreement with experimental data from tests on autogenous healing.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Additional Information:	PDF uploaded in accordance with publisher's policies. Journal has a 24 month embargo period.
Publisher:	Elsevier
ISSN:	0008-8846
Date of First Compliant Deposit:	4 August 2016
Date of Acceptance:	6 July 2016
Last Modified:	10 Nov 2024 09:15
URI:	https://orca.cardiff.ac.uk/id/eprint/93577

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