Effects of Thermal Conditioning at High Temperatures on the Response of Concrete Elements Confined with a PBO-FRCM Composite System
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 1
Abstract
Fiber-reinforced cementitious matrix (FRCM) materials are well-recognized as suitable for the strengthening of reinforced concrete (RC) and masonry existing structures. However, one of the main issues regarding these materials is the lack of knowledge about their behavior when subjected to elevated temperatures or fires. In this study, the effects of thermal actions on both the mechanical properties of the PBO (short of polypara-phenylene-benzo-bisthiazole)–FRCM materials (textile, mortar, and FRCM) and the structural response of unconfined and PBO-FRCM-confined concrete cylinders were analyzed. An experimental investigation was conducted on PBO fabrics, PBO-FRCM coupons, and unconfined and PBO-FRCM confined concrete cylinders. All specimens were thermally conditioned at temperatures ranging from 20°C to 200°C and then tested at room temperature (20°C). The thermal treatment consisted of five heating/cooling down cycles (one per day); in each cycle, the specimens were kept in an electric oven, heated at a predefined temperature over a period of 6 h, and then left to cool down at ambient temperature before the beginning of the next cycle. The test results evidenced that the thermal conditioning affected both the mechanical properties of the FRCM materials and the effectiveness of the concrete confinement. To predict the strength of the PBO-FRCM confined concrete cylinders after thermal conditioning, a semiempirical model defined through the analysis of a database of experimental results (those described in this paper and others available in the literature) was also proposed.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article. Some or all data, models, or code that support the findings in this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors would like to express their appreciation to Ruregold s.r.l., Italy, for providing the composite materials in this study.
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 1 • January 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jan 29, 2021
Accepted: Jun 3, 2021
Published online: Oct 29, 2021
Published in print: Jan 1, 2022
Discussion open until: Mar 29, 2022
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