Characterization and Design of Multilayer PBO FRCM Composite Reinforcements for Concrete Structures
Publication: Journal of Composites for Construction
Volume 25, Issue 6
Abstract
Fiber-reinforced cementitious matrix (FRCM) composites can be preferred to other techniques to strengthen reinforced concrete (RC) members. Due to the limited cross-sectional area of textiles in FRCM, multilayer composites are often needed to provide adequate strength increase. Although multilayer FRCM composites have been already employed, quite limited research is available regarding the bond behavior of multilayer FRCM–concrete joints. Direct shear tests of FRCM–concrete joints and bending tests of FRCM-strengthened RC beams showed that when one or two textile layers are employed, debonding at the matrix–fiber interface generally occurs. When more than two layers are employed, detachment of the FRCM strip was observed in FRCM-strengthened RC beams, while limited studies of corresponding FRCM bond behavior were performed. The bond behavior of a multilayer bidirectional polyparaphenylene benzobisoxazole (PBO) FRCM composite applied onto a concrete substrate is investigated in this paper. Single-lap direct shear tests of PBO FRCM–concrete joints comprising two or four textile layers are performed, along with tensile tests of bare textile strips and single-layer FRCM coupons. Tests were conducted in both textile directions. The results obtained provide fundamental information on the effect of the textile direction and number of layers to be considered when designing the reinforcing system.
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Acknowledgments
The experimental tests presented in this paper were conducted in the Laboratorio Prove Materiali of the Politecnico di Milano, Italy. The financial support of A2A Spa is gratefully acknowledged. Ruregold Srl is gratefully acknowledged for providing the composite material.
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Journal of Composites for Construction
Volume 25 • Issue 6 • December 2021
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© 2021 American Society of Civil Engineers.
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Received: Jan 25, 2021
Accepted: Jun 28, 2021
Published online: Aug 27, 2021
Published in print: Dec 1, 2021
Discussion open until: Jan 27, 2022
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