Enrobage de l'armature dans le béton projeté : évaluation et effets

Authors: Gagnon, Frédéric
Advisor: Jolin, MarcBeaupré, Denis
Abstract: Since the first shotcrete nozzleman certification held by the American Concrete Institute (ACI) in the spring of 2001, the program has continuously grown in popularity. The nozzleman certification consists of making sure that the nozzle operator are capable of operating shotcrete equipments and apply shotcrete in a safe and effective manner. A significant part of the certification program consists of evaluating the rebar encasement on specific core extracts from shotcrete panels. Encasement is considered adequate or not by an examiner accredited by the ACI, according to a qualitative evaluation based on established parameters such as the presence of voids or defaults behind bars. However, there is a limited amount of objective information available to determine what is acceptable or not as for the quality of an encasement. This document presents experimental results relating to the evaluation of the effects of defects on durability and structural properties of a shotcrete application. More particularly, the effect of a poor quality encapsulation on the initiation of corrosion of reinforcing bars and on the properties of the bond between reinforcing steel and shotcrete are visited. The shotcrete’s consistency (amount of water added at the lance), the concrete cover thickness, the types of defects created behind the bar by a poor workmanship have a major importance on the properties of a shotcrete work.
Document Type: Mémoire de maîtrise
Issue Date: 2004
Open Access Date: 11 April 2018
Permalink: http://hdl.handle.net/20.500.11794/17997
Grantor: Université Laval
Collection:Thèses et mémoires

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