Transverse Thermal Expansion of FRP Bars Embedded in Concrete

Masmoudi, Radhouane; Zaidi, Ali; Gerard, Patrick D.

doi:10.1061/(asce)1090-0268(2005)9:5(377)

Cited by 46 publications

(38 citation statements)

References 4 publications

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“…The values of the CTE of FRP bars depend on many factors such as their modulus of elasticity, the fiber-volume fraction, and the type of fibers and resins used. For glass FRP (GFRP), the transverse CTE is three to five times higher than the CTE in the longitudinal direction, and also higher than the CTE of hardened concrete [1][2][3][4]. This thermal incompatibility between GFRP bars and concrete in the transverse direction induces high tensile stresses at the FRP bar/concrete interface when temperature increases [3,5].…”

Section: List Of Symbolsmentioning

confidence: 99%

“…This thermal incompatibility between GFRP bars and concrete in the transverse direction induces high tensile stresses at the FRP bar/concrete interface when temperature increases [3,5]. These stresses may cause radial cracks within the concrete and ultimately splitting failure of the concrete cover at high temperatures [2,[6][7][8][9].…”

Section: List Of Symbolsmentioning

confidence: 99%

“…This radial pressure produces tensile stresses within the concrete and ultimately splitting failure of the concrete cover if the confining action of the concrete is not sufficient. To determine the radial pressure P and the thermal strains and stresses in concrete and FRP bar, analytical models have been developed by Rahman et al [9], Aiello et al [7] and Masmoudi et al [2] for a concrete cylinder concentrically reinforced with FRP bar.…”

Section: Analytical Modelsmentioning

confidence: 99%

“…Using the strain compatibility analysis in an FRP bar/concrete cylinder problem, the radial pressure P exerted by the FRP bar at the FRP bar/concrete interface under a temperature increase ΔT is given by [2,9]:…”

Section: Thermal Stressesmentioning

confidence: 99%

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Combined Effect of Moisture and Temperature on Concrete Cover Surrounding GFRP Bars

Zaidi

Masmoudi

2011

Arab J Sci Eng

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In the last decade, fiber reinforced polymer (FRP) has become the best solution to the problem of corrosion in reinforced concrete structures. However, more detailed investigation of the thermal behavior of FRP bars embedded in wet concrete is required to avoid splitting failure of concrete cover of reinforced concrete structures immersed in water under temperature. This paper presents an experimental study to investigate the combined effect of moisture and temperature on the behavior of FRP bar and concrete cover using concrete cylinder specimens reinforced with glass FRP (GFRP) bars immersed in water and subjected to temperatures varying from −30 to +80 • C. The experimental results show that immersion in water at high temperature can damage the bond between GFRP bar and concrete. The temperatures required to produce splitting failure of concrete cover for concrete cover thickness to FRP bar diameter ratio (c/d b ) less than or equal to 1.5 immersed in water are between 50 and 60 • C, similar to those for specimens not immersed in water. Also, moisture has no significant influence on the thermal behavior of concrete cover surrounding GFRP bar for temperatures up to 60 • C. A comparison between the predicted and experimental transverse thermal strains is presented. The results show good agreement for temperatures up to 60 • C.

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Section: List Of Symbolsmentioning

confidence: 99%

Section: List Of Symbolsmentioning

confidence: 99%

Section: Analytical Modelsmentioning

confidence: 99%

Section: Thermal Stressesmentioning

confidence: 99%

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Combined Effect of Moisture and Temperature on Concrete Cover Surrounding GFRP Bars

Zaidi

Masmoudi

2011

Arab J Sci Eng

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“…Where Δ a /a is the transverse differential thermal strain; E c : modulus of elasticity of concrete; Masmoudi et al [12] and Zaidi et al [13] have developed an analytical model based on the same theory. The expression of the radial pressure is given by:…”

Section: Analytical Modelmentioning

confidence: 99%

Behavior of FRP Bars-Reinforced Concrete Slabs under Temperature and Sustained Load Effects

et al. 2014

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Abstract:The large temperature variation has a harmful effect on concrete structures reinforced with fiber reinforced polymer (FRP) bars. This is due to the significant difference between transverse coefficient of thermal expansion of these bars and that of the hardened concrete. This difference generates a radial pressure at the FRP bar/concrete interface, and may cause splitting cracks within concrete. This paper presents results of an experimental and analytical study carried out on FRP-reinforced concrete slabs subjected, simultaneously, to thermal and mechanical loads. The analytical model based on the theory of linear elasticity consists to evaluate combined effects of thermal and mechanical loads on the transverse expansion of FRP bars. Parameters studied in this investigation are the concrete cover thickness, FRP bar diameter, and the temperature variation. The thermal cycles were varied from −30 to +60 °C. Comparisons between analytical and experimental results show that transverse strains predicted from the proposed model are in good correlation with experimental results.

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Bond durability of basalt‐fiber‐reinforced‐polymer bars embedded in lightweight aggregate concrete subjected to freeze–thaw cycles

Deng

Wang

Sun

et al. 2021

Structural Concrete

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In recent years, basalt-fiber-reinforced-polymer (BFRP) bars have become popular to replace steels. However, little is known about the performance of BFRP bars inserted in lightweight aggregate concrete (LWAC), especially the bonding performance under freeze-thaw (FT) cycles. In this study, a bond strength test was conducted for BFRP bars embedded in LWAC after FT cycles. BFRP bars, epoxy-coated bars, and steels were tested for comparison purposes. The test parameters are the bar type, compressive strength of the LWAC, and FT cycles; 108 specimens were subjected to 0, 15, 30, and 50 FT cycles. Moreover, the bond strength models of the three types of bars were fitted to LWAC. The test results prove that the number of FT cycles significantly affects the bonding performance of the bar embedded in LWAC. The results also show that the bond strength prediction of the fitting model considering the FT cycle effect is consistent with the experimental results. K E Y W O R D S basalt-fiber-reinforced-polymer bars, bond, epoxy-coated steel bars, freeze-thaw cycles, lightweight aggregate concrete

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Transverse Thermal Expansion of FRP Bars Embedded in Concrete

Cited by 46 publications

References 4 publications

Combined Effect of Moisture and Temperature on Concrete Cover Surrounding GFRP Bars

Combined Effect of Moisture and Temperature on Concrete Cover Surrounding GFRP Bars

Behavior of FRP Bars-Reinforced Concrete Slabs under Temperature and Sustained Load Effects

Bond durability of basalt‐fiber‐reinforced‐polymer bars embedded in lightweight aggregate concrete subjected to freeze–thaw cycles

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