Bond Strength of Lap-Spliced GFRP Bars in Concrete Beams

Esfahani, M. Reza; Rakhshanimehr, Mehrollah; Mousavi, Seyed Roohollah

doi:10.1061/(asce)cc.1943-5614.0000359

Cited by 36 publications

(3 citation statements)

References 9 publications

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“…After 28 days of curing, cut the concrete with German automatic cutting-machine, and then dry the bonding section for microstructure observation and pore structure test. (2) GFRP bars/reinforced concrete beams Esfahani et al (Esfahani et al, 2013) compared the test data and calculation results of GFRP reinforced concrete beams (ACI American Concrete Institute, 2006). The comparison showed that the evaluation of the bond performances of the GFRP bars and concrete without lateral reinforcement was not conservative enough and even overestimated.…”

Section: Sample Fabricationmentioning

confidence: 99%

The effect of pore characteristics on the bonding properties of steam-cured concrete and GFRP bars

et al. 2023

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Steam cured concrete prefabricated components has the advantages of short construction period, less environmental pollution, convenient construction and low cost, and is widely used in high-speed railway projects. However, the changes of later strength, capillary water absorption and pore distribution led to the reduction of durability of steam-curing concrete and accelerated the damage speed of GFRP bars and bond performance between concrete and GFRP bars. In this study, the method of steam curing is adopted to simulate the damage of components caused by actual steam curing environment. The influence of pore characteristics on the bonding properties of steam cured concrete and GFRP steel bar is analyzed from both micro and macro perspectives. Analysis method combining pore characteristics with bonding strength. The test results showed that the hydration products of concrete were unaffected, but the density of the hydration products changed due to the steam curing. The porosity of the steam-cured concrete was much higher than that of the standard-cured concrete. The number of gel pores smaller than 20 nm accounted for 12.27% of the total number of pores on average, which was about twice the proportion of the gel pores of this size in the standard-cured concrete. The proportion of harmful voids with pore size of 50–200 nm and greater than 200 nm is higher than that of standard curing concrete. The bond strength of the steam-cured concrete and GFRP bars was 30% lower than that of the standard-cured concrete. With the change of the thickness of the concrete cover and the diameter of GFRP bars, the bond strength changed significantly. Based on the analysis of the test data, a predictive model of the bond strength deterioration for the steam-cured concrete and GFRP bars was established. The model fully accounted for influence factors such as the porosity, diameter, anchor length, and concrete strength.

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Section: Sample Fabricationmentioning

confidence: 99%

The effect of pore characteristics on the bonding properties of steam-cured concrete and GFRP bars

et al. 2023

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“…Results show that the FRP stress limit was directly proportional to the splice length [20] . In another experimental study, thirteen beam specimens were tested to investigate the bond strength of lap spliced GFRP bars [21] . It was seen that the effect of transverse reinforcement on the bond strength between GFRP bars and concrete depends on the surface properties of reinforcing bars.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of GFRP-reinforced Concrete Beams with Straight and Hooked-end Bar Lap Splices

Mirzabagheri,

(Sam) Salem

2024

Jour. of build. mater. Sci.

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Glass fibre-reinforced polymer (GFRP) has been increasingly used as the main reinforcement in concrete structures due to its durability and resistance to corrosion. However, there is a lack of data regarding the bond behaviour of GFRP bars with 180-degree hooked ends used in flexure concrete elements. To investigate the effects of the hooked ends of GFRP bars on the bond strength with concrete, beams reinforced with GFRP bars with straight and hooked-end lap splices at the midspan were modelled using ABAQUS/Standard software. The finite element models were validated using the experimental results of four full-size concrete beams. Two beam specimens had straight-end bars, while the other two had hooked-end bars. Sensitivity analysis was performed to find the proper values for model verification, such as dilation angle and mesh density. According to the outcomes of the parametric study conducted in this research, changing the length of the bar lap splices in the range of 15 to 40 times the bar diameter had a negligible effect on the beam’s overall behaviour. Increasing the number of reinforcing bars from 3 to 5 increased the beam flexural strength by about 33%, whereas increasing the diameter of the bars from 10 to 20 mm doubled the beam strength.

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“…According to the previous experimental investigations [1,2,4,5,[16][17][18][19][20], it was found that bond strength of GFRP bars in conventional concrete depends on several parameters, such as bar diameter, embedment length, compressive concrete strength, surface configuration, bar type, concrete cover, bar position and transverse reinforcement. Table 1 summarizes the parameters that influence the bond strength considered in the design guidelines (ACI 440.1R [21], CSA-S806 [22], CSA-S6 [23] and JSCE [24]).…”

Section: Introductionmentioning

confidence: 99%

Bond between glass fibre reinforced polymer bars and high - strength concrete

2019

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In this study, bond properties of glass fibre reinforced polymer (GFRP) bars embedded in high-strength concrete (HSC) were experimentally investigated using a pull-out test. The experimental program consisted of testing 84 pull-out specimens prepared according to ACI 440.3R-12 standard. The testing of the specimens was carried out considering bar diameter (9.5, 12.7 and 15.9 mm), embedment length (2.5, 5, 7.5 and 10 times bar diameter) and surface configuration (helical wrapping with slight sand coating (HW-SC) and sand coating (SC)) as the main parameters. Twelve pull-out specimens reinforced with 16 mm steel bar were also tested for comparison purposes. Most of the specimens failed by a pull-out mode. Visual inspection of the tested specimens reinforced with GFRP (HW-SC) bars showed that the pull-out failure was due to the damage of outer bar surface, whilst the detachment of the sand coating was responsible for the bond failure of GFRP (SC) reinforced specimens. The bond stressslip behaviour of GFRP (HW-SC) bars is different from that of GFRP (SC) bars and it was also found that GFRP (SC) bars gave a better bond performance than GFRP (HW-SC) bars. It was observed that the reduction rate of bond strength of both GFRP types with increasing the bar diameter and the embedment length was reduced in the case of high-strength concrete. Bond strength predictions obtained from ACI-440.1R, CSA-S806, CSA-S6 and 2 JSCE design codes were compared with the experimental results. Overall, all design guidelines were conservative in predicting bond strength of both GFRP bars in HSC and ACI predictions were closer to the tested results than other codes.

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Bond Strength of Lap-Spliced GFRP Bars in Concrete Beams

Cited by 36 publications

References 9 publications

The effect of pore characteristics on the bonding properties of steam-cured concrete and GFRP bars

The effect of pore characteristics on the bonding properties of steam-cured concrete and GFRP bars

Numerical Study of GFRP-reinforced Concrete Beams with Straight and Hooked-end Bar Lap Splices

Bond between glass fibre reinforced polymer bars and high - strength concrete

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