Near-to-surface properties affecting bond strength in concrete repair |
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| Affiliation: | 1. University of Liège, Faculty of Applied Sciences, ArGEnCO Department, Chemin des Chevreuils, 1, 4000 Liège, Belgium;2. Warsaw University of Technology, Faculty of Civil Engineering, Department of Building Materials Engineering, Al. Armii Ludowej 16, PL 00637 Warsaw, Poland;1. Warsaw University of Technology, Faculty of Civil Engineering, Department of Building Materials Engineering, Al. Armii Ludowej 16, PL 00637 Warsaw, Poland;2. University of Liège, Faculty of Applied Sciences, ArGEnCO Department, Allée de la découverte, 9, 4000 Liège, Belgium;3. Warsaw University of Technology, Faculty of Civil Engineering, Department of Theoretical Mechanics and Pavement Modelling, Al. Armii Ludowej 16, PL 00637 Warsaw, Poland;1. College of Materials Science and Engineering, Chongqing University, Chongqing 400045, PR China;2. Department of Chemistry and Materials, Logistical Engineering University, Chongqing 401311, PR China;1. Key Laboratory for Wind and Bridge Engineering of Hunan Province, College of Civil Engineering, Hunan University, Changsha, China;2. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, China;1. Sinoma Research Institute, Sinoma International Engineering Co., Ltd., Beijing, China;2. Section of Materials and Environment, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, The Netherlands;3. Magnel Laboratory for Concrete Research, Department of Structural Engineering, Ghent University, Technologiepark-Zwijnaarde 904, Ghent (Zwijnaarde), Belgium |
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| Abstract: | One of the main processes for repairing concrete structures is patch repair. Efficiency and durability of a repaired system depends on the bond between concrete substrate and repair material. By increasing the surface roughness, the surface treatment of concrete substrate can promote mechanical interlocking that is one of the basic mechanisms of adhesion. Nevertheless, some problems may arise from “co-lateral” effects of the treatment, especially due to the development of microcracks inside the substrate. In the presented paper, the effect of concrete substrate surface preparation has been characterized by roughness measurement, description of microcracking in the near-to-surface layer and a pull-off cohesion test. After repair, pull-off bond strength has been evaluated. It is concluded that selection of a suitable surface treatment technique should be preceded by the analysis of its aggressiveness in relation to the concrete substrate strength. A procedure for bond strength estimation using multiple regression approach, based on parameters describing surface quality really generated from various roughening techniques, is then proposed. |
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| Keywords: | Concrete Surface treatment Adhesion Mechanical interlocking Repair Roughness Microcracking Pull-off test |
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