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) 1468–1475

SMAR 2024 – 7 th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Experiments on concrete test beams with recycled aggregates and natural fibers Francisco Játiva a, *, Juan Martin Tamayo a , Tommy Silva a , Oscar Granja a , Raul Cabrera b , Xavier Arce b , Luis Guadalupe b , Mauricio Guillen b , Eddie Koenders c , Eva Lantsoght a,d a Universidad San Francisco de Quito, Diego de Robles S/N, EC170109 Cumbaya, Quito, Ecuador b Holcim,Via a la Costa, EC090901 Guayaquil, Ecuador Abstract To develop more sustainable concrete mixes, circular and bio-based constituents for the concrete mix are sought. As traditional concrete contains 70% aggregate by volume, using recycled aggregates is an attractive solution within the circular economy. To address concrete brittles, bio-based renewable fibers, such as abaca and coconut, can replace the traditional steel or polypropylene fibers. This study evaluates recycled aggregate concrete with natural fibers, comparing it to traditional polypropylene fibers in terms of mechanical properties. Concrete compressive strength, flexural strength, and dynamic modulus of reference and novel mixes were determined. The results of these experiments show that the compressive strength of the mixes with recycled aggregates is 65% of the control, and that the toughness of the beams with abaca is 48% of those with polypropylene fibers, and of the beams with coconut fiber are 29% of those with polypropylene fibers. The dynamic modulus of the discs with recycled aggregates is 30% of the control, whereas the modulus of the discs with abaca is 15% and those with coconut is 20% of the control. These first results show that concrete mixes using recycled aggregates and abaca fibers are a promising solution. These preliminary results will be used for further research geared towards the development of bio-based materials for tomorrow. © 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: Aggregate characterization; bio-based materials; compressive strength; dynamic modulus; flexural performance; post peak performance; toughness. SMAR 2024 – 7 th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Experiments on concrete test beams with recycled aggregates and natural fibers Francisco Játiva a, *, Juan Martin Tamayo a , Tommy Silva a , Oscar Granja a , Raul Cabrera b , Xavier Arce b , Luis Guadalupe b , Mauricio Guillen b , Eddie Koenders c , Eva Lantsoght a,d a Universidad San Francisco de Quito, Diego de Robles S/N, EC170109 Cumbaya, Quito, Ecuador b Holcim,Via a la Costa, EC090901 Guayaquil, Ecuador c TU Darmstadt, Franziska-Braun-Straße 3, 64287 Darmstadt, Germany d Delft University of Technology, Stevinweg 1, 2628 CN, Delft, the Netherlands Abstract To develop more sustainable concrete mixes, circular and bio-based constituents for the concrete mix are sought. As traditional concrete contains 70% aggregate by volume, using recycled aggregates is an attractive solution within the circular economy. To address concrete brittles, bio-based renewable fibers, such as abaca and coconut, can replace the traditional steel or polypropylene fibers. This study evaluates recycled aggregate concrete with natural fibers, comparing it to traditional polypropylene fibers in terms of mechanical properties. Concrete compressive strength, flexural strength, and dynamic modulus of reference and novel mixes were determined. The results of these experiments show that the compressive strength of the mixes with recycled aggregates is 65% of the control, and that the toughness of the beams with abaca is 48% of those with polypropylene fibers, and of the beams with coconut fiber are 29% of those with polypropylene fibers. The dynamic modulus of the discs with recycled aggregates is 30% of the control, whereas the modulus of the discs with abaca is 15% and those with coconut is 20% of the control. These first results show that concrete mixes using recycled aggregates and abaca fibers are a promising solution. These preliminary results will be used for further research geared towards the development of bio-based materials for tomorrow. © 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: Aggregate characterization; bio-based materials; compressive strength; dynamic modulus; flexural performance; post peak performance; toughness. © 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 c TU Darmstadt, Franziska-Braun-Straße 3, 64287 Darmstadt, Germany d Delft University of Technology, Stevinweg 1, 2628 CN, Delft, the Netherlands

* Corresponding author. Tel.: (+593 )2297 1700; fax: (+593 2) 289 0070. E-mail address: fjativav@usfq.edu.ec * Corresponding author. Tel.: (+593 )2297 1700; fax: (+593 2) 289 0070. E-mail address: fjativav@usfq.edu.ec

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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