A study of damage healing cycles in vascular networks containing silicate-based healing agents

Salman, Salah, De Nardi, Cristina and Gardner, Diane ORCID: https://orcid.org/0000-0002-2864-9122 2022. A study of damage healing cycles in vascular networks containing silicate-based healing agents. Presented at: 8th International Conference on Self-Healing Materials, Milan, Spain, 20-22 June 2022.

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Abstract

A range of self-healing technologies for cementitious materials has been developed over the last 2 decades, including vascular networks. The main advantage of healing through vascular networks and what distinguishes them from other healing techniques, is their ability to provide an ongoing supply of healing agents. This allows for repeated healing following multiple discrete damage events. The aim of this study was to investigate the healing efficiency of a vascular network containing silicate-based healing agents subject to two healing cycles. Experiments were conducted on laboratory-scale specimens with vascular networks formed from hollow channels that were filled with either sodium silicate or lithium silicate held under an externally supplied constant pressure. The healing agent was introduced to the host matrix prior to each testing stage (damage) and what remained in the channels following testing was removed with pressurized air. This allowed for full replenishment of the healing agent before the next damage stage. Specimens were tested under 3-point bending until crack mouth opening displacements (CMOD) of 0.15mm or 0.3mm were recorded. The healing efficacy was assessed by evaluating the recovery in the specimens’ mechanical strength and stiffness over the two healing cycles. At a CMOD of 0.15mm specimens containing sodium silicate demonstrated a similar healing response in the second healing cycle to the first, with healing efficiencies in excess of 70% in the former. Lithium silicate proved a promising healing agent, with a comparable healing performance at both CMODs to that of sodium silicate during the first healing cycle, albeit followed by a weaker response in the second healing cycle. Nonetheless, the ability for repeated healing by a vascular network healing system containing silicate-based adhesives has been successfully demonstrated.

Item Type:	Conference or Workshop Item (Paper)
Status:	Unpublished
Schools:	Engineering
Subjects:	Q Science > Q Science (General) T Technology > TA Engineering (General). Civil engineering (General) T Technology > TH Building construction
Funders:	EPSRC
Last Modified:	06 Apr 2023 12:43
URI:	https://orca.cardiff.ac.uk/id/eprint/158124

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