PSI - Issue 64

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com Procedia Structural Integrity 64 (2024) 1347–1359 Structural Integrity Procedia 00 (2023) 000 – 000

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www.elsevier.com/locate/procedia

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers 10.1016/j.prostr.2024.09.370 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers Abstract This paper presents the development of a new filament wound CFRP sleeve and resin grout for the efficient anchorage of CFRP parallel wire bundles. 25 years old re-used CFRP wires were examined with regard to a possible drop in strength or stiffness due to aging and then processed into two bridge cables. The new anchorage and cables were tested to tensile capacity (giving on average 1.833 MN) in two full scale instrumented experiments using laser and strain gauges before two new 26-30 m long post-tensioning cables were produced by Carbo-Link AG with each 37 of the regained CFRP wires. Both CFRP parallel wire cables were finally successfully prestressed to 1 MN (55% of their UTS) in order to strengthen an existing bridge in the Swiss Alps over the river Ilfis in summer 2023. This strengthening project is thoroughly described. The full-scale tests confirmed the durability and strength of the new anchorage system, and the feasibility for re-use of valuable CFRP pultrusions for post-tensioning was proven by the successful bridge strengthening which also showed the sustainability potential of CFRP pultrusions. Keywords: CFRP, pultruded wires, Reuse of serviced CFRP, bridge cables, post tensioning. 1. Introduction: Long-term durability of CFRP pultrusions CFRP pultrusions used in civil engineering applications are produced by continuous pressing of high strength carbon fibers previously wetted with an epoxy matrix polymer through a heated die (typically at 180°C-200°C). Typical * Corresponding author. Tel.: +4158 765 4117; Fax.: +4158 765 4099. E-mail address: giovanni.terrasi@empa.ch * Corresponding author. Tel.: +4158 765 4117; Fax.: +4158 765 4099. E-mail address: giovanni.terrasi@empa.ch SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Re-use of 25 years old CFRP pultrusions in novel post-tensioning cables for bridge strengthening Giovanni Pietro Terrasi a *, Christian Affolter a , Alex Stutz a , Gregor Schwegler b , André Guerotto c , Andreas Winistörfer c SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Re-use of 25 years old CFRP pultrusions in novel post-tensioning cables for bridge strengthening Giovanni Pietro Terrasi a *, Christian Affolter a , Alex Stutz a , Gregor Schwegler b , André Guerotto c , Andreas Winistörfer c a Empa, Material Science and Technology, 8600 Dübendorf, Switzerland b vif traffic and infrastructure of canton Lucerne, 6010 Kriens, Switzerland c Carbo-Link AG, 8632 Fehraltorf, Switzerland Abstract This paper presents the development of a new filament wound CFRP sleeve and resin grout for the efficient anchorage of CFRP parallel wire bundles. 25 years old re-used CFRP wires were examined with regard to a possible drop in strength or stiffness due to aging and then processed into two bridge cables. The new anchorage and cables were tested to tensile capacity (giving on average 1.833 MN) in two full scale instrumented experiments using laser and strain gauges before two new 26-30 m long post-tensioning cables were produced by Carbo-Link AG with each 37 of the regained CFRP wires. Both CFRP parallel wire cables were finally successfully prestressed to 1 MN (55% of their UTS) in order to strengthen an existing bridge in the Swiss Alps over the river Ilfis in summer 2023. This strengthening project is thoroughly described. The full-scale tests confirmed the durability and strength of the new anchorage system, and the feasibility for re-use of valuable CFRP pultrusions for post-tensioning was proven by the successful bridge strengthening which also showed the sustainability potential of CFRP pultrusions. Keywords: CFRP, pultruded wires, Reuse of serviced CFRP, bridge cables, post tensioning. 1. Introduction: Long-term durability of CFRP pultrusions CFRP pultrusions used in civil engineering applications are produced by continuous pressing of high strength carbon fibers previously wetted with an epoxy matrix polymer through a heated die (typically at 180°C-200°C). Typical © 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers a Empa, Material Science and Technology, 8600 Dübendorf, Switzerland b vif traffic and infrastructure of canton Lucerne, 6010 Kriens, Switzerland c Carbo-Link AG, 8632 Fehraltorf, Switzerland