Experimental investigation of stress transfer and failure mechanism between existing concrete and CFRP grid-sprayed PCM

Wang, Bo; Uji, Kimitaka; Wu, Tao; Dai, Huijuan; Yan, Dejun; Guo, Rui

doi:10.1016/j.conbuildmat.2019.04.168

Cited by 23 publications

(8 citation statements)

References 15 publications

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“…From this perspective, the conclusion can be drawn that delamination or debonding of the CFRP from the surrounding PCM (a second possible phenomenon) can be excluded, implying that local debonding occurred at the interface between FRP grids and the concrete substrate, rather than between the FRP grids and PCM. Similar results were also obtained by other studies [65,66]. Overall, none of the FRP grids' strain reached rupture strain, as measured by uniaxial tensile tests when various load levels of strengthened beams arrived at ultimate states.…”

Section: Load-strain (P-ε) Responsessupporting

confidence: 90%

Experimental Study on Shear Strengthening of RC Beams with an FRP Grid-PCM Reinforcement Layer

et al. 2019

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This paper investigates the shear strengthening effect of a number of reinforced concrete (RC) beams strengthened by a reinforcement layer which combines carbon fiber reinforced polymer (CFRP) grid and polymer cement mortar (PCM). A total of ten RC beams, including three types of specimens as Series A and seven kinds of specimens as Series B, were prepared and investigated. The test variables in both series of experiments included various reinforcement ranges and different reinforcement amounts that consisted of CFRP grids’ spacing and cross-section areas. The experimental results suggest that the shear strengthening effect of the CFRP grid-PCM layer for RC beams is obvious and adequate. Meanwhile, better performance is observed if the CFRP grid-PCM reinforcement layer is used for the full sectional reinforcement of RC beams with an I-shaped profile, in contrast to RC beams with reinforcement of the web only. In addition, a new evaluation method based on the effective strain of the CFRP grid is developed to determine the shear capacity of RC beams strengthened by a CFRP grid-PCM layer.

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Section: Load-strain (P-ε) Responsessupporting

confidence: 90%

Experimental Study on Shear Strengthening of RC Beams with an FRP Grid-PCM Reinforcement Layer

et al. 2019

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“…Table 6 shows the maximum loads and failure patterns of all specimens. The tensile strength utilization ratio of CFRP was defined as the ratio of the maximum tensile load of the specimens to the test ultimate tensile action of the CFRP grids [29]. The tested ultimate tensile loads of the CR8 and CR6 CFRP grids were 45.07 kN and 28.6 kN, respectively.…”

Section: Failure Patterns and Maximum Loadsmentioning

confidence: 99%

Study of the Interfacial Bond Behavior between CFRP Grid–PCM Reinforcing Layer and Concrete via a Simplified Mechanical Model

et al. 2021

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This paper presents the results of pull-out tests conducted to investigate the interfacial bond behavior between a carbon-fiber-reinforced polymer (CFRP) grid–polymer cement mortar (PCM) reinforcing layer and existing concrete, and proposes a simplified mechanical model to further study the interface bond mechanism. Four specimens composed of a CFRP grid, PCM, and concrete were tested. The influence of the type of CFRP grid and the grid interval on the interface bond behavior was discussed. The failure patterns, maximum tensile loads, and CFRP grid strains were obtained. The change process of interface bond stress was investigated based on the grid strain analysis. In addition, the simplified mechanical model and finite element model (FEM) were emphatically established, and the adaptability of the simplified mechanical model was validated through the comparative analysis between the FEM results and the test results. The research results indicate that a CFRP grid with a larger cross-sectional area and smaller grid interval could effectively improve the interface bond behavior. The tensile stress was gradually transferred from the loaded edge to the free edge in the CFRP grid. The interface bond behavior was mainly dependent on the anchorage action of the CFRP grid in the PCM, and the bond action between the PCM and the concrete. The FEM results were consistent with the test results, and the simplified mechanical model with nonlinear springs could well describe the interface bond mechanism between the CFRP grid–PCM reinforcing layer and concrete.

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“…In that study, the effect of the number of grid points and the relationship between the horizontal and vertical grids and the bonding behavior of the CFRP grid were investigated. Wang et al [ 25 ] examined the pull-out test of a single grid point and CFRP grid embedded in the concrete. The results showed that the tensile strength of the CFRP grid embedded in the concrete was less than half that of the single grid.…”

Section: Introductionmentioning

confidence: 99%

A Study on Tensile Behavior According to the Design Method for the CFRP/GFRP Grid for Reinforced Concrete

Kim

Min

et al. 2022

Materials

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In the present study, fiber-reinforced plastics (FRP) grid-reinforced concrete with very rapid hardening polymer (VRHP) mortar composites were fabricated using three types of design methods for the FRP grid (hand lay-up method, resin infusion method, and prepreg oven vacuum bagging method), along with two types of fibers (carbon fiber and glass fiber) and two types of sheets (fabric and prepreg). The FRP grid was prepared by cutting the FRP laminates into a 10 mm thick, 50 mm × 50 mm grid. The tensile behavior of the FRP grid embedded in composites was systematically analyzed in terms of the load extension, fracture mode, partial tensile strain, and load-bearing rate. The CFRP grid manufactured by the prepreg OVB method showed the best tensile behavior compared to the CFRP grid manufactured by the hand lay-up and resin infusion methods. The load-bearing of each grid point was proportional to the height from the load-bearing part when reaching the maximum tensile load. In addition, finite element analysis was conducted to compare the experimental and analysis results.

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Experimental investigation of stress transfer and failure mechanism between existing concrete and CFRP grid-sprayed PCM

Cited by 23 publications

References 15 publications

Experimental Study on Shear Strengthening of RC Beams with an FRP Grid-PCM Reinforcement Layer

Experimental Study on Shear Strengthening of RC Beams with an FRP Grid-PCM Reinforcement Layer

Study of the Interfacial Bond Behavior between CFRP Grid–PCM Reinforcing Layer and Concrete via a Simplified Mechanical Model

A Study on Tensile Behavior According to the Design Method for the CFRP/GFRP Grid for Reinforced Concrete

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