PSI - Issue 64

First page Table of contents Previous page 1711 Next page Last page

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 ^ĐŝĞŶĐĞ ŝƌĞĐƚ Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ

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

Procedia Structural Integrity 64 (2024) 1111–1117

SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Preliminary results of three-point bending tests of concrete notched beams with different content of PVA fibers Veronica Bertolli a , Tommaso D’Antino a* and Christian Carloni b a Politecnico di Milano, Department of Architecture, Built Environment and Construction Engineering, Piazza Leonardo da Vinci 32, Milan 20133, Italy. b Department of Civil and Environmental Engineering, Case Western Reserve University, 10900 Euclid Ave, Cleveland, OH 44106, USA. Abstract During the last few decades, fiber-reinforced concrete (FRC) has been widely used in the construction industry to increase strength and toughness of concrete structural members. Different types of fiber have been used in FRC, with different dimensions, shapes, and mechanical properties. The addition of short, dispersed steel fibers in concrete gained large popularity in recent years and steel FRC (SFRC) is commonly used in specific structural applications (e.g., precast tunnel segments) and to partially substitute conventional internal transverse steel reinforcement. Nowadays, the addition of synthetic fibers in concrete is becoming increasingly popular, thanks to the ability of these fibers to delay the occurrence of microcrack and/or provide post-cracking tensile residual strength. Furthermore, synthetic fibers have better durability than steel fibers. Among different synthetic fibers, polyvinyl alcohol (PVA) fibers have shown promising results. In this paper, a preliminary experimental campaign is carried out to investigate the effect of micro and macro PVA fibers on concrete tensile strength and toughness. To this aim, three-point bending (TPB) tests are performed on concrete notched beams with different contents of PVA fibers. Results obtained with PVA-FRC are evaluated with respect to a corresponding plain concrete specimen, and the possible synergy between micro and macro PVA fibers embedded in concrete is assessed. Results show that PVA macrofibers increase the concrete post-cracking tensile residual strength. © 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: FRC, PVA fibers, residual strength, three-point bending tests. SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Preliminary results of three-point bending tests of concrete notched beams with different content of PVA fibers Veronica Bertolli a , Tommaso D’Antino a* and Christian Carloni b a Politecnico di Milano, Department of Architecture, Built Environment and Construction Engineering, Piazza Leonardo da Vinci 32, Milan 20133, Italy. b Department of Civil and Environmental Engineering, Case Western Reserve University, 10900 Euclid Ave, Cleveland, OH 44106, USA. Abstract During the last few decades, fiber-reinforced concrete (FRC) has been widely used in the construction industry to increase strength and toughness of concrete structural members. Different types of fiber have been used in FRC, with different dimensions, shapes, and mechanical properties. The addition of short, dispersed steel fibers in concrete gained large popularity in recent years and steel FRC (SFRC) is commonly used in specific structural applications (e.g., precast tunnel segments) and to partially substitute conventional internal transverse steel reinforcement. Nowadays, the addition of synthetic fibers in concrete is becoming increasingly popular, thanks to the ability of these fibers to delay the occurrence of microcrack and/or provide post-cracking tensile residual strength. Furthermore, synthetic fibers have better durability than steel fibers. Among different synthetic fibers, polyvinyl alcohol (PVA) fibers have shown promising results. In this paper, a preliminary experimental campaign is carried out to investigate the effect of micro and macro PVA fibers on concrete tensile strength and toughness. To this aim, three-point bending (TPB) tests are performed on concrete notched beams with different contents of PVA fibers. Results obtained with PVA-FRC are evaluated with respect to a corresponding plain concrete specimen, and the possible synergy between micro and macro PVA fibers embedded in concrete is assessed. Results show that PVA macrofibers increase the concrete post-cracking tensile residual strength. © 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: FRC, PVA fibers, residual strength, three-point bending tests. © 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. Tel.: +39-02-2399-4352. E-mail address: tommaso.dantino@polimi.it * Corresponding author. Tel.: +39-02-2399-4352. E-mail address: tommaso.dantino@polimi.it

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

Made with FlippingBook Digital Proposal Maker