Durability Prediction for GFRP Reinforcing Bars Using Short-Term Data of Accelerated Aging Tests

Chen, Yi; Davalos, Julio F.; Ray, Indrajit

doi:10.1061/(asce)1090-0268(2006)10:4(279)

Cited by 227 publications

(121 citation statements)

References 15 publications

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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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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 use of GFRP bars can prevent deterioration due to corrosion, improve durability and increase the service life of structures. Researches have been conducted to evaluate the durability performance in aggressive environment and to develop models for predicting long-term strength retention of GFRP bars embedded in concrete (Benmokrane et al 2002;Chen et al 2006;Robert et al 2009;Mufti et al 2007). GFRP bars were proved to be a durable face to the concrete environment and it was shown that the service lifetime allowed to reach tensile strength retention of less than 50% should be infinite (Robert et al 2009;CSA S6-06 2006) which also supported the findings of Mufti et al (2007) who tested few GFRP reinforced structures after up to 9 years in service conditions.…”

Section: Introductionmentioning

confidence: 99%

Bond Strength of GFRP Bars Embedded in Engineered Cementitious Composite using RILEM Beam Testing

Hossain

2018

Int J Concr Struct Mater

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This paper presents a study on the bond characteristics of glass fiber reinforced polymer (GFRP) bars in engineered cementitious composite (ECC). Ninety beam specimens having variable parameters namely bar diameter, GFRP bar types (standard low modulus 'LM' and high modulus 'HM'), two concrete types (ECC and normal concrete 'NC') and embedded length (5, 7 and 10 times bar diameter) were tested as per RILEM specifications. Bond stress-slip characteristics and failure modes of specimens as well as influence of variable parameters on bond strength are described. The performance of various Codes and other existing equations in predicting bond strength of both low/high modulus GFRP bars embedded in ECC compared to NC is described based on experimental results. The bond strength decreased with the increase of embedment length-maximum bond strength reduction of 36% was observed. For both ECC and NC, bond strength reduced with the increase of bar size and ECC produced maximum 1.6 times higher bond strength compared to NC. Code based and other existing equations were found conservative in predicting bond strength of GFRP bars embedded in ECC.

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“…Several studies demonstrated the vulnerability of glass fibers (mainly E-glass) by showing a reduced tensile strength after ageing [21][22][23][24][25]. In these studies, it has been noted that the diffusion of the OH − ions out of the glass structures (leaching) is the most common dissolution reaction of the glass material.…”

Section: Introduction and Research Significancementioning

confidence: 99%

Properties of Aged GFRP Reinforcement Grids Related to Fatigue Life and Alkaline Environment

et al. 2017

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Abstract:In recent years, even if Fiber Reinforced Polymer (FRP) composites have been widely used for strengthening of civil buildings, a new generation of materials has been studied and proposed for historical masonry construction. These buildings, mainly made of stone work, are common in many areas of Europe and Asia and recent earthquakes has been the cause of many catastrophic failures. The brittleness of unreinforced historic masonry can be considerably reduced using new retrofitting lighter-weight materials such FRP, even if limitations were evidenced due to material and mechanical compatibility with poor substrates. Thus, fibrous reinforcements were used as long fibres incorporated into a cement or lime matrix, which better match with the properties of ancient masonry. The use of low strength fibers such as glass and basalt, respect to carbon, in presence of an alkaline matrix brought out durability issues, due to the chemical vulnerability of common glass and basalt fibres. The objective of this research is to explore the effects of selected aqueous environments and fatigue loading on the mechanical and physical properties of composite grids, made of E-CR (Electrical/Chemical Resistance) glass fibers and epoxy-vinylester resin, used as tensile reinforcement in new composite reinforced mortar systems. Glass-fiber-reinforced polymer (GFRP) coupons were subjected to tensile testing and a severe protocol of durability tests, including alkaline environment and fatigue tensile loads. Accelerated ageing tests were used to simulate long-term degradation in terms of chemical attack and consequent reduction of tensile strength. The ageing protocol consisted of immersion at 40 • C in alkaline bath made by deionized water and Ca(OH) 2 , 0.16% in weight, solution for 30 days. GFRP specimens aged and unaged were also tested under tensile fatigue cycles up to 1,000,000 cycles and a nominal frequency of 7.5 Hz. After this severe conditioning the tests indicate a good tensile strength retention of the GFRP in absence of fatigue loads, while a significant loss in fatigue life was experienced when both alkaline exposure and fatigue loads were applied.

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Durability Prediction for GFRP Reinforcing Bars Using Short-Term Data of Accelerated Aging Tests

Cited by 227 publications

References 15 publications

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

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

Bond Strength of GFRP Bars Embedded in Engineered Cementitious Composite using RILEM Beam Testing

Properties of Aged GFRP Reinforcement Grids Related to Fatigue Life and Alkaline Environment

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