PSI - Issue 64

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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 64 (2024) 168–174

SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures The effect of controlled fiber alignment of carbon fibers on the electrical properties of carbon fiber-cement composite under cyclic flexural loading Shaofeng Qin a, *, Ning Liu a , Jishen Qiu a a The Hong Kong University of Science and Technology, Hong Kong, China Abstract The desirable mechanical properties of fiber-reinforced cementitious composite (FRCC) have been proven in the past. In addition to the advancement of the material and material tailoring that significantly enhances the wide applications of FRCC, the fiber alignment control has been used to enhance the flexural strength recently. However, the investigation on the effect of aligned carbon fiber on the electrical properties especially under loading conditions is rare. In the study, an extrusion-based technology was applied to control the fiber alignment, and the effect of aligned carbon fibers on the electrical properties was studied under elastic and plastic conditions of the cyclic flexural loading. The results revealed the high sensitivity of the carbon fiber-cement composites with aligned fibers to the plastic deformation while all the composites with/without aligned fibers presented similar sensitivity to the elastic deformation. © 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 Keywords: 3D printing, Fiber-reinforced cementitious composite, fiber alignment, electrical, cyclic flexural test. 1. Introduction Cementitious materials are widely used in large concrete structures due to their high compressive strength, but they exhibit low resistance to flexural and tensile loading, leading to sudden brittle failure. The addition of reinforcing steel bars or alternative fibers, such as steel fiber, carbon fiber (CF), and polymer fiber, can improve the tensile properties SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures The effect of controlled fiber alignment of carbon fibers on the electrical properties of carbon fiber-cement composite under cyclic flexural loading Shaofeng Qin a, *, Ning Liu a , Jishen Qiu a a The Hong Kong University of Science and Technology, Hong Kong, China Abstract The desirable mechanical properties of fiber-reinforced cementitious composite (FRCC) have been proven in the past. In addition to the advancement of the material and material tailoring that significantly enhances the wide applications of FRCC, the fiber alignment control has been used to enhance the flexural strength recently. However, the investigation on the effect of aligned carbon fiber on the electrical properties especially under loading conditions is rare. In the study, an extrusion-based technology was applied to control the fiber alignment, and the effect of aligned carbon fibers on the electrical properties was studied under elastic and plastic conditions of the cyclic flexural loading. The results revealed the high sensitivity of the carbon fiber-cement composites with aligned fibers to the plastic deformation while all the composites with/without aligned fibers presented similar sensitivity to the elastic deformation. © 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 Keywords: 3D printing, Fiber-reinforced cementitious composite, fiber alignment, electrical, cyclic flexural test. 1. Introduction Cementitious materials are widely used in large concrete structures due to their high compressive strength, but they exhibit low resistance to flexural and tensile loading, leading to sudden brittle failure. The addition of reinforcing steel bars or alternative fibers, such as steel fiber, carbon fiber (CF), and polymer fiber, can improve the tensile properties © 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

* Corresponding author. E-mail address: sqinae@connect.ust.hk * Corresponding author. E-mail address: sqinae@connect.ust.hk

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

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