Bond characteristics of straight- and headed-end, ribbed-surface, GFRP bars embedded in high-strength concrete

Islam, Sirajul; Afefy, Hamdy M.; Sennah, Khaled; Azimi, Hossein

doi:10.1016/j.conbuildmat.2015.03.025

Cited by 114 publications

(14 citation statements)

References 23 publications

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“…The current experimental investigation finds that while studying the causes of bond behaviour, it is important to consider other parameters, such as fibre volume in each of the bundles for basalt or any other kind of FRP bars, as these may influence the bond behaviour. The reinforcement sectional area, surface roughness of the rebar, bar diameter, and friction at the bar-concrete interface are other factors that have been found to affect the bond behaviour of pull-out specimens [19,52,57,58]. Bonding can also be affected by surface treatment of the bars, and by the country of origin/production of the bars.…”

Section: Load-slip Relationshipmentioning

confidence: 99%

Experimental Investigation and Artificial Neural Network Based Prediction of Bond Strength in Self-Compacting Geopolymer Concrete Reinforced with Basalt FRP Bars

Rahman

Al-Ameri

2021

Applied Sciences

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The current research on concrete and cementitious materials focuses on finding sustainable solutions to address critical issues, such as increased carbon emissions, or corrosion attack associated with reinforced concrete structures. Geopolymer concrete is considered to be an eco-friendly alternative due to its superior properties in terms of reduced carbon emissions and durability. Similarly, the use of fibre-reinforced polymer (FRP) bars to address corrosion attack in steel-reinforced structures is also gaining momentum. This paper investigates the bond performance of a newly developed self-compacting geopolymer concrete (SCGC) reinforced with basalt FRP (BFRP) bars. This study examines the bond behaviour of BFRP-reinforced SCGC specimens with variables such as bar diameter (6 mm and 10 mm) and embedment lengths. The embedment lengths adopted are 5, 10, and 15 times the bar diameter (db), and are denoted as 5 db, 10 db, and 15 db throughout the study. A total of 21 specimens, inclusive of the variable parameters, are subjected to direct pull-out tests in order to assess the bond between the rebar and the concrete. The result is then compared with the SCGC reinforced with traditional steel bars, in accordance with the ACI 440.3R-04 and CAN/CSA-S806-02 guidelines. A prediction model for bond strength has been proposed using artificial neural network (ANN) tools, which contributes to the new knowledge on the use of Basalt FRP bars as internal reinforcement in an ambient-cured self-compacting geopolymer concrete.

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Section: Load-slip Relationshipmentioning

confidence: 99%

Experimental Investigation and Artificial Neural Network Based Prediction of Bond Strength in Self-Compacting Geopolymer Concrete Reinforced with Basalt FRP Bars

Rahman

Al-Ameri

2021

Applied Sciences

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“…Generally, it has been adduced that the concrete properties are considered the basic factor affecting the ductility of RC beams with FRP bars rather than the FRP properties. A lot of research has been performed on the application and mechanical properties of reinforced concrete beams with GFRP (Glass Fiber Reinforced Polymer -GFRP), such as their flexural behaviour, bond properties, fracture performance, and durability [14][15][16][17][18][19][20]. The most important results gained in the scope of these research activities have revealed that the deflection at mid-span and crack width decrease significantly with an increase in reinforcement ratio.…”

Section: Introductionmentioning

confidence: 99%

Flexural Response of RC beams cast with normal and steel fibre concrete internally reinforced with various types of FRP bars

2021

JCE

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Fibre Reinforced Polymer (FRP) bars can be used as an alternate for reinforcing bars to avoid corrosion of steel. Samples of reinforced concrete beams cast with normal or steel fibre concrete (SFC), internally reinforced with Glass Fibre Reinforced Polymer (GFRP) or steel bars, are prepared and tested in this paper. Experimental results show that compressive strength of concrete increases with an increase in steel fibre (SF) ratio used in this study (from 0% to 1.5%). Also, the beams reinforced with GFRP bars have a lower initial stiffness and higher ductility than those reinforced with steel bars.

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“…Bond performance is one of the most basic and important properties in the ordinary environment. The level of effectiveness of the bond stress between the reinforcement bars and the concrete depends mainly on the bond quality, and the transmission mechanism of the bond stress for all the reinforcement structures is an important issue in the structural design . The bond force consists of three components: chemical adhesion, friction, and mechanical interlocking between the bars and the concrete .…”

Section: Introductionmentioning

confidence: 99%

“…The bond force consists of three components: chemical adhesion, friction, and mechanical interlocking between the bars and the concrete . These forces can be eventually decomposed into a vertical force, which is the radial pressure applied to the surrounding concrete, and a horizontal force, which is the effective bond strength . Bond failure between steel bars and the concrete is the result of splitting or shearing of the concrete .…”

Section: Introductionmentioning

confidence: 99%

Bond‐Slip Behavior Between GFRP Bars and Mortar Based on Pull‐Out Tests

et al. 2018

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Bond performance is important in glass fiber reinforcement polymer (GFRP) bar reinforced mortar structure. To study bond behavior between GFRP bars and mortar, pull‐out tests were conducted on nine cylinder specimens with reinforced carbon sheets. The loading mode included monotonic loading and cyclic loading. Bond strength, slip, bond stiffness, and residual bond properties were investigated and fitted to bond‐slip curves of classical models. The results show that monotonic loading, cyclic constant loading, and cyclic variable loading have little effect on the ultimate bond strength between a GFRP bar and mortar. The bond‐slip curves have the same change laws. Under cyclic constant loading, bond stiffness increases with cycles loading times and is basically stable after 10 times, and the bond‐slip curves show the same characteristics. Under cyclic variable loading, bond stress–strain has a linear characteristic, bond stiffness presents a hardening tendency, and bond‐slip curve is similar and stable in each loading–unloading process. The ascending stage and descending stage of the bond‐slip curve match the modified Eligehausen, Popov, and Bertero (mBPE) model, no horizontal line is observed in the peak load stage, the descending stage curve is approximately linear, and the residual stage curve exhibits a fluctuating decreasing tendency. Based on the test results, a Gaussian function and its parameters are proposed for the expression of the residual stage. POLYM. COMPOS., 40:2840–2849, 2019. © 2018 Society of Plastics Engineers

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Bond characteristics of straight- and headed-end, ribbed-surface, GFRP bars embedded in high-strength concrete

Cited by 114 publications

References 23 publications

Experimental Investigation and Artificial Neural Network Based Prediction of Bond Strength in Self-Compacting Geopolymer Concrete Reinforced with Basalt FRP Bars

Experimental Investigation and Artificial Neural Network Based Prediction of Bond Strength in Self-Compacting Geopolymer Concrete Reinforced with Basalt FRP Bars

Flexural Response of RC beams cast with normal and steel fibre concrete internally reinforced with various types of FRP bars

Bond‐Slip Behavior Between GFRP Bars and Mortar Based on Pull‐Out Tests

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