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Self-healing potential of supplementary cementitious materials in cement mortars: sorptivity and pore structure

Maddalena, Riccardo, Taha, Hussameldin and Gardner, Diane 2021. Self-healing potential of supplementary cementitious materials in cement mortars: sorptivity and pore structure. Developments in the Built Environment 6 , 100044. 10.1016/j.dibe.2021.100044

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Abstract

This paper presents the autogenic self-healing potential of Portland cement (PC) blends made with conventional supplementary cementitious materials (SCMs), to improve the water-tightness by reducing the overall pore size. Mortar samples were prepared by mixing PC, sand and water, and partially replacing PC by either silica fume (SF), pulverised fuel ash (PFA), or ground granulated blast-furnace slag (GGBS). Damaged samples were subjected to a water bath to heal microcracks and recover the water-tightness, by further hydration of the starting minerals. Water absorption and density measurements in undamaged, damaged and healed conditions were used to determine the autogenous healing potential of SCMs mixes, showing a post-healing absorption recovery of up to 68% compared to the mix with PC only. Thermal analysis, XRD and MIP measurements confirmed the capability of SCMs to promote the formation of hydrated phases, and reduce the overall pore size by more than 88% compared to PC mixes.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
ISSN: 2666-1659
Funders: EPSRC
Date of First Compliant Deposit: 25 February 2021
Date of Acceptance: 18 January 2021
Last Modified: 18 Mar 2021 13:33
URI: http://orca.cardiff.ac.uk/id/eprint/138983

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