Bond strength between concrete substrate and metakaolin geopolymer repair mortar: Effect of curing regime and PVA fiber reinforcement |
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| Affiliation: | 1. University of British Columbia, Department of Civil Engineering, 6250 Applied Science Lane, Vancouver, BC, V6T 1Z4, Canada;2. Federal Centre for Tech. Education of Minas Gerais (CEFET-MG), Av. Amazonas 7675 - Nova Gameleira, Belo Horizonte, M.G., 30510-000, Brazil;1. Department of Civil Engineering, Faculty of Applied Science, The University of British Columbia, 6250 Applied Science Lane, Vancouver, BC, V6T 1Z4, Canada;2. Department of Civil Engineering, Federal Centre for Technological Education of Minas Gerais (CEFET-MG), Av. Amazonas 7675, Belo Horizonte, 30510-000, Brazil;1. College of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215011, China;2. Key Laboratory of Advanced Civil Engineering Materials of Education Ministry, School of Material Science and Technology, Tongji University, 4800 Cao’an Road, Shanghai 201804, China;3. Dept. of Civil Engineering, University of Toronto, Toronto, ON M5S1A4, Canada;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. Research Center for Advances in Civil Engineering and Construction Materials, Program in Civil Engineering, Faculty of Engineering and Architecture, Rajamangala University of Technology Isan, Nakhon Ratchasima 30000, Thailand;2. Sustainable Infrastructure Research and Development Center, Dept. of Civil Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand;3. Program of Civil Technology, Faculty of Industrial Technology, Lampang Rajabhat University, Lampang 52100, Thailand;4. Dept. of Civil Engineering, Faculty of Engineering, Rajamangala University of Technology Isan, Khon Kaen Campus, Khon Kaen 40000, Thailand;5. Dept. of Architecture, Faculty of Engineering, Mie University, Mie 514-8504, Japan |
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| Abstract: | The suitability of repairing Portland cement concrete with geopolymer mortars is explored as a viable way to replace Portland cement in concrete repairs and reduce their carbon footprint. Bond tests are performed through non-standard slant shear tests with variable bond plane inclination to assess concrete-geopolymer shear bond strength under different combinations of normal and shear stresses at the concrete-geopolymer interface. Interfacial cohesion and friction coefficients, two inherent mechanical properties of the substrate-repair interface, are extrapolated from experimental data and compared among different types of geopolymer repairs. The adoption of different curing temperatures for the geopolymer repair mortar (20°C and 45°C) and its reinforcement with various contents of Polyvinyl Alcohol fibers (volume fractions Vf = 0%, 0.5%, and 1%) are investigated to optimize the substrate-repair bond. Mechanical tests are supported by statistical analysis and microscope observation. |
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| Keywords: | Bond Geopolymer Repair Concrete substrate Cohesion PVA fiber |
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