Strengthening of reinforced concrete beams using fiber-reinforced cementitious matrix systems fabricated with custom-designed mortar and fabrics

doi:10.1007/s11709-023-0967-9

Front. Struct. Civ. Eng.

2023, Vol. 17

Issue (7) : 1100-1116 https://doi.org/10.1007/s11709-023-0967-9

RESEARCH ARTICLE

Strengthening of reinforced concrete beams using fiber-reinforced cementitious matrix systems fabricated with custom-designed mortar and fabrics

Ahmadreza RAMEZANI, Mohammad Reza ESFAHANI(

), Javad SABZI

Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

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Abstract

The performance of a new fiber-reinforced cementitious matrix (FRCM) system developed using custom-designed mortar and fabrics is investigated in this study. The behavior of this system is evaluated in terms of both the flexural and shear strengthening of reinforced concrete beams. Eight beams are designed to assess the effectiveness of the FRCM system in terms of flexural strengthening, and four specimens are designed to investigate their shear behavior. The parameters investigated for flexural strengthening are the number of layers, span/depth ratio, and the strengthening method. Unlike previous studies, custom fabrics with similar axial stiffness are used in all strengthening methods in this study. In the shear-strengthened specimens, the effects of the span/depth ratio and strengthening system type (fiber-reinforced polymer (FRP) or FRCM) are investigated. The proposed FRCM system exhibits desirable flexural and shear strengthening for enhancing the load capacity, provides sufficient bonding with the substrate, and prevents premature failure modes. Considering the similar axial stiffness of fabrics used in both FRCM and FRP systems and the higher load capacity of specimens strengthened by the former, cement-based mortar performs better than epoxy.

Keywords fiber-reinforced cementitious matrix flexural strengthening shear strengthening carbon fiber-reinforced polymer shear span

Corresponding Author(s): Mohammad Reza ESFAHANI

Just Accepted Date: 03 April 2023 Online First Date: 31 August 2023 Issue Date: 20 September 2023

Cite this article:

Ahmadreza RAMEZANI,Mohammad Reza ESFAHANI,Javad SABZI. Strengthening of reinforced concrete beams using fiber-reinforced cementitious matrix systems fabricated with custom-designed mortar and fabrics[J]. Front. Struct. Civ. Eng., 2023, 17(7): 1100-1116.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-023-0967-9
https://academic.hep.com.cn/fsce/EN/Y2023/V17/I7/1100

Fig.1 Mesh used in the FRCM system.

Fig.2 Tailored carbon bars.

Tab.1 Properties of the specimens

Fig.3 Geometry and internal reinforcement arrangement of specimens strengthened in flexure.

Fig.4 Geometry and internal reinforcement arrangement of specimens strengthened in shear.

Fig.5 EBR strengthening method: (a) application of mortar layer; (b) sandwiching the mesh.

Fig.6 NSE strengthening method: (a) cover removal; (b) carbon mesh installation.

Fig.7 Installation of tailored carbon bars in grooves: (a) grooves; (b) carbon bar installation.

Fig.8 Four-point flexural test scheme.

Fig.9 Three-point bending test.

Tab.2 Summary of test results of specimens strengthened in flexure

Fig.10 Cracking pattern in specimens: (a) F2.75-Control; (b) F2.75-E-1L; (c) F2.75-E-2L; (d) F2.75-E-3L.

Fig.11 Load–deflection curves of specimens F2.75-Control, F2.75-E-1L, F2.75-E-2L, and F2.75-E-3L.

Fig.12 Failure mode of specimen F2.75-E-2L.

Fig.13 Failure mode of specimen F2.75-E-3L.

Fig.14 Cracking pattern of specimens: (a) F3.25-E-2L; (b) F2.25-E-2L.

Fig.15 Failure mode of specimen F2.25-E-2L.

Fig.16 Moment–deflection curves of specimens F3.25-E-2L, F2.75-E-2L, and F2.25-E-2L.

Fig.17 Cracking pattern of specimens: (a) F2.75-N-2L; (b) F2.75-B.

Fig.18 Load–deflection curves of specimens F2.75-Control, F2.75-E-2L, F2.75-N-2L, and F2.75-B.

Tab.3 Ratio of predicted-to-experimental load-carrying capacities

Tab.4 Experimental results for specimens strengthened under shear

Fig.19 Load–deflection curves of specimens S1.5-FRCM-D20, S1.5-FRP-D20, S2.5-FRCM-D20, and S2.5-Control-D20.

Fig.20 Failure mode of specimen S1.5-FRCM-D20.

Fig.21 Failure modes of: (a) S1.5-FRCM-D20; (b) S1.5-FRP-D20; (c) S2.5-FRCM-D20; (d) S2.5-Control-D20.

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