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Conception de murs de soutènement préfabriqués et de panneaux de réparation en bétons fibrés à ultra-hautes performances

Danny Sylvestre

Master's thesis (2021)

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Abstract

Weather-exposed reinforced concrete structures such as urban retaining walls, vertical canal walls or industrial wharves face significant sustainability issues. The rough winter context of Canada, and more particularly of Quebec, involves deteriorations related to freeze-thaw cycles causing mass or surface cracking. In addition, the massive application of de-icing salts on roads causes scaling of concrete and accelerates corrosion of steel rebars. These causes of deterioration require partial repairs or complete replacement of the structure. Repairs or replacements of structures in urban areas require complete or partial closure of traffic lanes, which is very expensive for the owners. These closures also cause indirect social and economic impacts. It is therefore relevant to develop repair solutions that are more sustainable and that can be implemented more quickly to limit the number and duration of repair interventions. In this context, the solution proposed in this research project is to develop prefabricated retaining walls and repair panels using ultrahigh-performance fiber-reinforced concrete (UHPC). On the one hand, prefabrication will speed up the repair or replacement of structures, in addition to limiting cracking due to restricted shrinkage. The use of UHPC significantly improves the durability of the structure, due to its increased durability properties. On the other hand, its mechanical properties significantly greater to those of conventional concrete will limit the amount of material used and thus reduce the weight for transportation.

Résumé

Les ouvrages en béton armé exposés aux intempéries tels que les murs de soutènement en zone urbaine, les parois verticales de canal ou les quais industriels font face à des problèmes de durabilité importants. Le contexte hivernal rigoureux du Canada et plus particulièrement du Québec, implique des détériorations liées aux cycles de gel-dégel causant une fissuration massique ou de surface. De plus, l'épandage massif de sels de déverglaçage sur les routes cause l'écaillage du béton et accélère la corrosion des aciers d'armature. Ces causes de détérioration nécessitent des réparations partielles ou un remplacement complet de la structure. Les travaux de réparation ou de remplacement de structures en zone urbaine exigent la fermeture complète ou partielle de voies de circulation, ce qui est très coûteux pour les propriétaires d'ouvrages. Ces travaux impliquent également une entrave à la circulation causant des impacts sociaux et économiques indirects. Il est donc pertinent de développer des solutions de réparation plus durables et qui peuvent être mises en place plus rapidement afin de limiter le nombre et la durée des interventions de réparation.

Department: Department of Civil, Geological and Mining Engineering
Program: Génie civil
Academic/Research Directors: Jean-Philippe Charron and Bruno Massicotte
PolyPublie URL: https://publications.polymtl.ca/6642/
Institution: Polytechnique Montréal
Date Deposited: 19 Oct 2021 13:13
Last Modified: 08 Jun 2023 11:37
Cite in APA 7: Sylvestre, D. (2021). Conception de murs de soutènement préfabriqués et de panneaux de réparation en bétons fibrés à ultra-hautes performances [Master's thesis, Polytechnique Montréal]. PolyPublie. https://publications.polymtl.ca/6642/

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