Abstract
This work assessed the self-healing capacity of fibre reinforced concretes containing different admixtures (crystalline admixture CA, expansive agent CSA and superabsorbent polymer SAP) and submitted to different exposure conditions in laboratory (water immersion, wet/dry cycles and ambient air for 3 months, water flow for 1 week) as well as a long-term real outdoor exposition (1 year in Montreal climate). Self-healing was assessed by water permeability measurements performed on prisms presenting a realistic flexural macrocrack. The results, presented in Healing Ratio and equivalent crack width, showed different self-healing kinetics and efficiency according to the mix composition, but especially to the exposition. The average final Healing Ratios reached 84% in water, 93% in wet/dry cycles and 71% in water flow and in real outdoor exposure. The SAP and CA mixes presented the best healing performance in real outdoor condition. No synergetic effect was found when combining CA+CSA and CA+SAP. Additional microscopic analyses showed different healing products according to the exposition.
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