Abstract
Self-healing cementitious materials can extend the service life of structures, improve safety during repair activities and reduce costs with minimal human intervention. Recent advances in self-healing research have shown promise for capsule-based and intrinsic healing systems. However, limited information is available regarding vascular-based self-healing mechanisms. The aim of this work is to compare different commercially available healing agents regarding their suitability in a self-healing vascular network system by examining a regain in durability and mechanical properties. The healing agents investigated include sodium silicate, two polyurethanes, two water repellent agents and an epoxy resin. Sealing efficiencies above 100% were achieved for most of the healing agents, and both polyurethanes and the epoxy resin showed high regain in strength. The results obtained from this study provide a framework for selecting a healing agent given a specific application, as a healing agent’s rheology and curing properties can affect the optimal geometry and design of a vascular network.
Highlights
Self-healing cementitious materials can extend the service life of structures, improve safety during repair activities and reduce costs with minimal human intervention
This study evaluated evaluatedthethe self-healing performance of different agents through an embedded linear vascular glass network in reinforced concrete specimens
Two polyurethanes, an epoxy resin and a sodium siliwere selectedwere as healing agents for this study, reported efficiencies cate solution selected as healing agents forand thisallstudy, andsealing all reported sealingabove effi100%, except for the series
Summary
Self-healing cementitious materials can extend the service life of structures, improve safety during repair activities and reduce costs with minimal human intervention. Most intrinsic and capsule-based self-healing systems can be incorporated in a concrete mix without being severely damaged, while vascular networks require more care to avoid brittle failure during casting (e.g., vibrating the concrete mix in localized areas, utilizing a self-consolidating mix design). Investigations in healing agent selection for vascular networks have been limited far because the development of vascular self-healing systems designed for cementitious materials is still in the proof-of-concept stages of research. A number of suitable healing agents for vascular networks have been used before for concrete in capsule-based or injection repair methods.
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