Combined effects of saline solution and moist concrete on long-term durability of GFRP reinforcing bars

Robert, Mathieu; Benmokrane, Brahim

doi:10.1016/j.conbuildmat.2012.08.021

Cited by 220 publications

(81 citation statements)

References 24 publications

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“…Moreover, regarding ductility, due to the linear elastic properties of the GFRP bars up to failure, the conventional definition of ductility cannot be applied to concrete beams reinforced with GFRP reinforcement. Several research papers on GFRP in concrete structures identified the major measure of pseudo-ductility as the deformability index [11][12][13]. Several evaluation methods, such as the energy-based method and the deformation-based method, have been suggested to calculate the ductility index (also called the deformability index) for concrete reinforced with GFRP reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Flexural Behaviors of GFRP Reinforced Concrete Beams Exposed to Accelerated Aging Exposure Conditions

2014

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This study investigates the impact of accelerated aging conditions on the long-term flexural behavior and ductility of reinforced concrete (RC) members with glass fiber-reinforced polymer (GFRP) bars (RC-GFRP specimen) and steel bars (RC-steel specimen). A total of thirty six specimens were designed with different amounts of reinforcement with three types of reinforcing bars (i.e., helically wrapped GFRP, sand-coated surface GFRP and steel). Eighteen specimens were subjected to sustained loads and accelerated aging conditions (i.e., 47 °C and 80% relative humidity) in a chamber. The flexural behavior of specimens under 300-day exposure was compared to that of the companion specimens without experiencing accelerated aging conditions. Results indicate that the accelerated aging conditions reduced flexural capacity in not only RC-steel, but also RC-GFRP specimens, with different rates of reduction. Different types of GFRP reinforcement exhibited different rates of degradation of the flexural capacity when embedded in concrete under the same exposure conditions. Several existing models were compared with experimental results for predicting the deflection and deformability index for specimens. Bischoff and Gross's model exhibited an excellent prediction of the time-dependent deflections. Except for the deformability index proposed by Jaeger, there was no general trend related to the aging duration. This study recommends the need for further investigation on the prediction of the deformability index.

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Section: Introductionmentioning

confidence: 99%

Long-Term Flexural Behaviors of GFRP Reinforced Concrete Beams Exposed to Accelerated Aging Exposure Conditions

2014

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“…Abbasi and Hogg showed that the impact of temperature on the interface is greater than the identity of either the fiber or the matrix, especially when the temperature approaches 80°C. Robert tested GFRP bars that were anchored in concrete for 365 days, and his results indicated that water immersion had no influence on either the interface between the fiber and resin or the interface between the bar body and the concrete.…”

Section: Background and Research To Datementioning

confidence: 99%

“…At present, no standard durability test method exists, which makes it difficult to compare the results obtained by different researchers . Table shows the results of the durability test, with time and environmental conditions as indicators.…”

Section: Background and Research To Datementioning

confidence: 99%

Durability study on glass fiber reinforced polymer soil nail via accelerated aging test and long‐term field test

et al. 2015

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Replacing steel reinforcements with glass fiber reinforced polymer (GFRP) bars has emerged as one of the most promising solutions to the problem of corrosion in geotechnical engineering. Accelerated aging and field tests were conducted to investigate the durability of GFRP bars that were used as soil nails in slope reinforcement. Two types of E‐glass/(vinylester and unsaturated polyester) were immersed in alkaline and saline solutions for 60 d, 180 d and 360 d. Mechanical and physical experiments were carried out to obtain the tensile strength and identify the reasons for damage and strength reduction. A pullout test was carried out after the GFRP soil nails were embedded in a slope for three years. The accelerated aging test results showed that alkaline conditions had a larger influence on the degradation of GFRP bars than did saline solutions and that strength reduction generally occurred at an earlier stage for the alkaline conditions than for the saline solution. The corrosion resistance of an unsaturated polyester bar is much lower than that of the vinylester bar, and the bar diameter has a certain impact. From the field test results, it can be seen that the GFRP soil nails are durable and perform well at the task of supporting a slope. The technology for sensing fiber Bragg gratings (FBG) is very convenient for monitoring soil nails and is suitable for long‐term observation. POLYM. COMPOS., 38:2863–2873, 2017. © 2015 Society of Plastics Engineers

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“…In severe alkaline concrete environment, the mechanical performance degradation of the GFRP reinforcing bars is closely related to the alkaline solution diffusion coefficient [21][22][23][24][25][26]. Katsuki and Uomoto [21] suggest the relationship between the tensile strength variation and the alkaline diffusion coefficient of FRP reinforcing bars.…”

Section: Diffusion Coefficient Of Alkaline Solutionmentioning

confidence: 99%

Experimental Investigation of the Effects of Concrete Alkalinity on Tensile Properties of Preheated Structural GFRP Rebar

Roh

Park

Moon

2017

Advances in Materials Science and Engineering

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The combined effects of preexposure to high temperature and alkalinity on the tensile performance of structural GFRP reinforcing bars are experimentally investigated. A total of 105 GFRP bar specimens are preexposed to high temperature between 120 ∘ C and 200 ∘ C and then immersed into pH of 12.6 alkaline solution for 100, 300, and 660 days. From the test results, the elastic modulus obtained at 300 immersion days is almost the same as those of 660 immersion days. For all alkali immersion days considered in the test, the preheated specimens provide slightly lower elastic modulus than the unpreheated specimens, showing only 8% maximum difference. The tensile strength decreases for all testing cases as the increase of the alkaline immersing time, regardless of the prehearing levels. The tensile strength of the preheated specimens is about 90% of the unpreheated specimen for 300 alkali immersion days. However, after 300 alkali immersion days the tensile strengths are almost identical to each other. Such results indicate that the tensile strength and elastic modulus of the structural GFRP reinforcing bars are closely related to alkali immersion days, not much related to the preheating levels. The specimens show a typical tensile failure around the preheated location.

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Combined effects of saline solution and moist concrete on long-term durability of GFRP reinforcing bars

Cited by 220 publications

References 24 publications

Long-Term Flexural Behaviors of GFRP Reinforced Concrete Beams Exposed to Accelerated Aging Exposure Conditions

Long-Term Flexural Behaviors of GFRP Reinforced Concrete Beams Exposed to Accelerated Aging Exposure Conditions

Durability study on glass fiber reinforced polymer soil nail via accelerated aging test and long‐term field test

Experimental Investigation of the Effects of Concrete Alkalinity on Tensile Properties of Preheated Structural GFRP Rebar

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