Technical Papers
Aug 18, 2023

Residual Mechanical Properties of PBO FRCM Composites after Elevated Temperature Exposure: Experimental and Comparative Analysis

Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 11

Abstract

The effects of the exposure to elevated temperatures on the mechanical performances of a PBO FRCM (fabric reinforced cementitious matrix) composite system, consisting of polypara-phenylene-benzo-bisthiazole (PBO) fiber meshes embedded into an inorganic mortar, widely used in the strengthening of existing degraded reinforced concrete structures, are analyzed and discussed in the paper. The residual tensile properties of PBO FRCM composites and the residual bond properties of PBO FRCM-to-concrete are analyzed through the results of an experimental investigation conducted on specimens subjected to heating-cooling regimes at temperatures ranging from 20°C to 300°C, and then tested at ambient temperature (20°C). Direct tensile (DT) tests on PBO FRCM coupons and direct single lap shear (DS) tests on PBO FRCM-concrete elements were performed. The parameter varied was the target temperature value, namely 20°C, 100°C, 200°C, and 300°C. Test results are reported in terms of cracking stress, tensile strength, ultimate tensile strain, uncracked and cracked elasticity moduli, failure mode, bond strength, and corresponding slip values. The obtained results are evidence that the effects of exposure at the target temperatures were different for each mechanical parameter. Significant reductions of the values measured at ambient temperature were observed only at 300°C. Temperature-dependent relationships for both tensile and bond mechanical parameters, useful for thermo-mechanical simulations and fire design of reinforced concrete structures strengthened with PBO FRCM composites, are also defined. Finally, the results of a comparative analysis between the experimental results described in the present paper and those available in the literature are reported and discussed.

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Data Availability Statement

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 used in this study.

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Go to Journal of Materials in Civil Engineering
Journal of Materials in Civil Engineering
Volume 35Issue 11November 2023

History

Received: Nov 2, 2022
Accepted: Mar 23, 2023
Published online: Aug 18, 2023
Published in print: Nov 1, 2023
Discussion open until: Jan 18, 2024

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Dept. of Civil Engineering, Univ. of Calabria, Via P. Bucci Cubo 39B, 7 Arcavacata di Rende, Cosenza 87036, Italy. ORCID: https://orcid.org/0000-0002-4029-6833. Email: [email protected]
Full Professor, Dept. of Civil Engineering, Univ. of Calabria, Via P. Bucci Cubo 39B, Arcavacata di Rende, Cosenza 87036, Italy (corresponding author). ORCID: https://orcid.org/0000-0003-1520-8018. Email: [email protected]
M. Guglielmi [email protected]
Ph.D. Student, Dept. of Civil Engineering, Univ. of Calabria, Via P. Bucci Cubo 39B, Arcavacata di Rende, Cosenza 87036, Italy. Email: [email protected]
Dept. of Civil Engineering, Univ. of Calabria, Via P. Bucci Cubo 39B, 14 Arcavacata di Rende, Cosenza 87036, Italy. ORCID: https://orcid.org/0000-0003-3882-1376. Email: [email protected]

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