Anchorage resistance of CFRP strips externally bonded to various cementitious substrates |
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| Affiliation: | 1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Structural Engineering Research Laboratory, CH-8600 Dübendorf, Switzerland;2. ?ód? University of Technology, Department of Concrete Structures, 90-924 ?ód?, Poland;1. ICIST and Escola Superior de Tecnologia do Barreiro, Setubal Polytechnic Institute, Rua Américo da Silva Marinho, 2839-001 Lavradio, Barreiro, Portugal;2. ICIST, Department of Civil Engineering and Architecture, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal;1. Department of Architecture, Inha Technical College, 253 Yonghyun-dong 253, Nam-ku, Incheon 402-752, Republic of Korea;2. Magnel Laboratory for Concrete Research, Department of Structural Engineering, Ghent University, Technologiepark-Zwijnaarde 904, B-9052 Gent, Belgium;3. Department of Architecture and Architectural Engineering, Kyoto University, Kyoto-daigaku-Katsura 4, Nishigyo-ku, Kyoto 615-8540, Japan;1. Dept. of Civil and Environmental Engineering, The University of Auckland, New Zealand;2. School of Civil, Environmental and Mining Engineering, University of Adelaide, Australia;1. UNIDEMI, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal;2. ICIST, CERIS, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal;3. UNIC, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal |
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| Abstract: | This paper presents a study on the anchorage capacity of Carbon Fiber Reinforced Polymer (CFRP) strips bonded to a cementitious substrate used for concrete surface reprofiling. The structural strengthening of a large-scale prestressed concrete girder in the framework of a bridge retrofitting project by means of prestressed CFRP strips required the levelling of an initial negative camber of about 2–4 cm. Both midspan and girder end situations were investigated with lap-shear and prestress force-releasing tests. Four different solutions regarding the levelling material, i.e. three mortars applied by hand as well as dry shotcrete, were tested. The results in terms of strain, slip and total anchorage resistance are presented and compared. In the end, dry shotcrete is recommended for the girder application. In addition to a very convincing bond behavior, the application is, despite the necessity of involving a specialized company from the field, clearly less time-consuming and easier. The retained solution represents an interesting approach for future applications in bridge retrofitting when an even surface is necessary for bonding CFRP strips. |
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| Keywords: | A Carbon fiber A Laminates B Delamination D Mechanical testing Cementitious substrates |
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