Effects of temperature on the behaviour of fiber reinforced polymer reinforced concrete members: experimental studies

El-Badry, Mamdouh; Abdalla, Hany; Ghali, Amin

doi:10.1139/cjce-27-5-993

Cited by 9 publications

(8 citation statements)

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“…As expected, the initial damage takes place more easily in a heterogeneous material than in a homogeneous one under the same initial and boundary conditions [6,7]. The experimental results reported by Ladnis (1999) [10] and Elbadry et al (2000) [5] confirmed this phenomenon.…”

Section: Thermal Stresses and Associated Cracking In Concrete Sectionsupporting

confidence: 62%

“…Consequently, an increase in temperature, in the order of 30 to 40 • C, will produce bursting stresses within the concrete that may cause splitting cracks or even spalling of the concrete cover [4]. This will weaken the bond of the FRP bars to the concrete, reduce the tension stiffening of the concrete and increase the deflections of the structure under service [5].…”

Section: Introductionmentioning

confidence: 99%

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Spalling of concrete cover of fiber-reinforced polymer reinforced concrete under thermal loads

Wong

Poon

et al. 2006

Mater Struct

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A finite element method using a proposed mesoscopic thermoelastic damage model (MTED) is verified for simulating the cracking process of a concrete section reinforced with fibre-reinforced polymer (FRP) bars. The cracking was due to the significant difference in thermal expansion properties between the concrete and the FRP materials at elevated temperatures. The numerical study reveals that although a conventional elastic analytical method can provide good estimates of the critical temperature increment of concrete cover failure of a cylindrical concrete section that is reinforced with a single bar, it gives too conservative predictions for typical rectangular sections with multiple bars. The study also shows that the concrete cover and the horizontal bar spacing have more influence than the vertical bar spacing on the determination of the critical temperature increments. Horizontal lapping of bars significantly lowers the critical temperature increment.Research significance Concrete cover failures due to thermal mismatches of a concrete section reinforced with FRP bars under service elevated temperature increments has been recognized. Previous experimental/analytical studies were based on cylindrical concrete specimens reinforced with a single bar. The crosseffects of multi-bars, which have not been thoroughly investigated before, are now quantified using the finite element method incorporating a proposed MTED model. As the proposed model can simulate the heterogeneity of material properties, the stress distribution, and the crack propagation, the mechanisms of thermal cracking of FRP reinforced concrete can be better understood.

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Section: Thermal Stresses and Associated Cracking In Concrete Sectionsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Spalling of concrete cover of fiber-reinforced polymer reinforced concrete under thermal loads

Wong

Poon

et al. 2006

Mater Struct

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“…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%

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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“…However, numerous studies cite the risk of concrete cracking due to tensile stresses induced by thermal expansion of FRP tendons, 17,18,22,[24][25][26] while the risk of tendons separating from the concrete due to contraction is also noted. 17 Nanni et al 24 report thermal expansion of FRP prestressing tendons causing splitting of concrete parallel to FRP tendons within one year of service.…”

Section: Implications Of Dimensional Changes In Frp/concrete Systemsmentioning

confidence: 99%

“…A number of studies have demonstrated experimentally the occurrence of concrete cracking owing to thermal expansion of FRP tendons. 12,[25][26][27] An example of such a study is that by Aiello et al 28 who showed that a temperature change of 308C in a GFRP bar (13 mm diameter, AE ft ¼ 58 ìå/ o C) encased in a 19 mm thick concrete tube (AE c ¼ 12 ìå/ o C, 3 . 9 MPa tensile strength) was sufficient to cause cracking.…”

Section: Implications Of Dimensional Changes In Frp/concrete Systemsmentioning

confidence: 99%

Uptake swelling and thermal expansion of CFRP tendons

Scott¹,

Lees²

2009

Proceedings of the Institution of Civil Engineers - Structures

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Carbon-fibre-reinforced polymer (CFRP) tendons can be used as a corrosion-resistant alternative to steel for reinforcing or prestressing concrete in aggressive marine environments. The design lives of many civil marine structures often span decades and so the long-term durability of the internal reinforcement is important. One significant, yet overlooked, aspect of CFRP tendon durability is its susceptibility to swell on absorption of aqueous solutions including water and salt water. This paper reviews uptake-induced swelling in CFRP materials and draws comparisons with studies of swelling caused by thermal effects. The diffusion of aqueous solutions and their interaction with the polymer matrix are identified as the primary mechanisms responsible for the swelling. Experimental details are presented that correlate the uptake of water and salt water to swelling observed in CFRP tendons. The results are contrasted with both uptake-and thermal-driven behaviour cited in the literature. Lamé 's equations are used to estimate the magnitude of the resulting stresses induced in the surrounding concrete. The practical significance of the findings is discussed, including the potential for cracking in the surrounding concrete cover and the implications for the tendon-concrete bond.

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Effects of temperature on the behaviour of fiber reinforced polymer reinforced concrete members: experimental studies

Cited by 9 publications

References 0 publications

Spalling of concrete cover of fiber-reinforced polymer reinforced concrete under thermal loads

Spalling of concrete cover of fiber-reinforced polymer reinforced concrete under thermal loads

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

Uptake swelling and thermal expansion of CFRP tendons

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