First generation microcapsule-based self-healing cementitious construction repair materials

Abstract The implementation of self-healing techniques as part of repair methodologies in extending the service life of concrete structures has great relevance as it can not only guarantee direct and timely ratification in the construction industry but also transform the outlook of existing infrastructure. Novel developed polymeric microcapsules containing liquid sodium silicate were used to affect autonomic self-healing to readily available commercial repair mortars for the first time. The experimental results proved the compatibility of the proposed composite cement-based repair materials in terms of fresh properties and mechanical strength. Optimum self-healing additive fractions were selected for three end applications and further investigation on the in situ self-repair potential of these novel composite materials was carried through. The results showed improved crack-width and crack-depth reduction and recovery in permeability. The technical and practical considerations encountered during the project reported herein will assist the future development and accelerated commercialisation of targeted self-healing concrete applications providing a valuable foundation for the next generation of sustainable construction practices.