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Article

Effects of Autogenous and Stimulated Self-Healing on Durability and Mechanical Performance of UHPFRC: Validation of Tailored Test Method through Multi-Performance Healing-Induced Recovery Indices

Department of Civil and Environmental Engineering, Politecnico di Milano, 20133 Milan, Italy
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Author to whom correspondence should be addressed.
Academic Editor: Rui Micaelo
Sustainability 2021, 13(20), 11386; https://doi.org/10.3390/su132011386
Received: 31 August 2021 / Revised: 25 September 2021 / Accepted: 7 October 2021 / Published: 15 October 2021
Chloride diffusion and penetration, and consequently chloride-induced corrosion of reinforcement, are among the most common mechanisms of deterioration of concrete structures, and, as such, the most widely and deeply investigated as well. The benefits of using Ultra-High Performance (Fiber-Reinforced) Concrete—UHP(FR)C to extend the service life of concrete structures in “chloride attack” scenarios have been addressed, mainly focusing on higher “intrinsic” durability of the aforementioned category of materials due to their compact microstructure. Scant, if nil, information exists on the chloride diffusion and penetration resistance of UHPC in the cracked state, which would be of the utmost importance, also considering the peculiar (tensile) behavior of the material and its high inborn autogenous healing capacity. On the other hand, studies aimed at quantifying the delay in chloride penetration promoted by self-healing, both autogenous and autonomous, of cracked (ordinary) concrete have started being promoted, further highlighting the need to investigate the multidirectional features of the phenomenon, in the direction both parallel and orthogonal to cracks. In this paper, a tailored experimental methodology is presented and validated to measure, with reference to its multidirectional features, the chloride penetration in cracked UHPC and the effects on it of self-healing, both autogenous and stimulated via crystalline admixtures. The methodology is based on micro-core drilling in different positions and at different depths of UHPC disks cracked in splitting and submitted to different exposure/healing times in a 33 g/L NaCl aqueous solution. Its validation is completed through comparison with visual image analysis of crack sealing on the same specimens as well as with the assessment of crack sealing and of mechanical and permeability healing-induced recovery performed, as previously validated by the authors, on companion specimens. View Full-Text
Keywords: self-healing; crystalline admixtures; chloride diffusion; ultra-high durability concrete self-healing; crystalline admixtures; chloride diffusion; ultra-high durability concrete
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MDPI and ACS Style

Cuenca, E.; Lo Monte, F.; Moro, M.; Schiona, A.; Ferrara, L. Effects of Autogenous and Stimulated Self-Healing on Durability and Mechanical Performance of UHPFRC: Validation of Tailored Test Method through Multi-Performance Healing-Induced Recovery Indices. Sustainability 2021, 13, 11386. https://doi.org/10.3390/su132011386

AMA Style

Cuenca E, Lo Monte F, Moro M, Schiona A, Ferrara L. Effects of Autogenous and Stimulated Self-Healing on Durability and Mechanical Performance of UHPFRC: Validation of Tailored Test Method through Multi-Performance Healing-Induced Recovery Indices. Sustainability. 2021; 13(20):11386. https://doi.org/10.3390/su132011386

Chicago/Turabian Style

Cuenca, Estefanía, Francesco Lo Monte, Marina Moro, Andrea Schiona, and Liberato Ferrara. 2021. "Effects of Autogenous and Stimulated Self-Healing on Durability and Mechanical Performance of UHPFRC: Validation of Tailored Test Method through Multi-Performance Healing-Induced Recovery Indices" Sustainability 13, no. 20: 11386. https://doi.org/10.3390/su132011386

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