Long-term creep behavior of basalt fiber reinforced polymer bars

Sokairge, Hesham; Elgabbas, Fareed; Rashad, Ahmed; Elshafie, Hany

doi:10.1016/j.conbuildmat.2020.120437

Cited by 27 publications

(5 citation statements)

References 7 publications

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“…Basalt fibers, which are drawn from basalt rocks and come at relatively low cost, have recently gained more attention as an alternative to glass fibers due to having superior mechanical properties [ 28 , 29 , 30 , 31 ]. The creep behavior of basalt FRP (BFRP)—especially containing epoxy matrices—has been investigated on cylindrical bars [ 32 , 33 ], and fatigue has been studied in various geometries with respect to failure mechanisms [ 34 , 35 , 36 , 37 ], stress ratios [ 38 ], matrix type [ 39 ], and environmental conditions [ 40 ]. Several studies found significant reductions in stiffness over the fatigue life caused by increased matrix damage and fiber rupture at longer cycles, with a 10 7 -cycle fatigue strength around 70–75% of the initial static strength [ 37 , 38 , 39 ].…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Static, Creep, and Fatigue Tensile Behavior of Basalt Fiber/Polypropylene Composite Rods for Passive Concrete Reinforcement

2021

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Fiber-reinforced polymer (FRP) composites are becoming more frequently adopted as so-called “corrosion-resistant” concrete reinforcement materials due to their excellent mechanical properties and formability. However, their long-term reliability must be thoroughly investigated in order to understand failure mechanisms and to develop service life models. This study is on the mechanical properties of a prototype basalt fiber-reinforced polypropylene (BFPP) rod under quasi-static and sustained loading. Static strength and modulus at elevated temperatures do not decrease significantly, but the variability in strength increases with temperature, as shown by a Weibull analysis. Creep behavior is typical of unidirectional FRP, where the creep rupture strength follows a power law. Fatigue at various stress ratios R reveals the sensitivity of composite strength to the matrix damage, which increases at lower values of R (i.e., higher stress amplitudes). These results are discussed in the context of service life and concrete structure design guidelines.

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Section: Introductionmentioning

confidence: 99%

Characterization of the Static, Creep, and Fatigue Tensile Behavior of Basalt Fiber/Polypropylene Composite Rods for Passive Concrete Reinforcement

2021

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“…Creep behaviour of BFRP has been investigated in (Wang et al 2014;Sokairge et al 2020) Sokairge et al 2020), estimating the million-hour creep rupture stress limit between 57.7% and 62.3%. These values can reportedly be improved to up to 63% by preconditioning of the bars via pretensioning for a short duration (Shi et al 2015) (Shi et al 2015).…”

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confidence: 99%

Short- and Long-Term Prestress Losses in Basalt FRP Prestressed Concrete Beams under Sustained Loading

et al. 2022

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The favourable mechanical properties of basalt fibre-reinforced polymer (BFRP) bars, such as their excellent strength-to-weight ratio, resistance to corrosion, lower environmental impact and electromagnetic neutrality, make them attractive for internal reinforcement of concrete elements with specific service requirements. Prestressing has emerged as a possible method for limiting the deflections and cracking of BFRP reinforced flexural RC elements. However, long-term behaviour of such structural members has not yet been investigated extensively. Therefore, this paper aims to give information on long-term behaviour and prestress losses of pretensioned BFRP reinforced concrete beams based on the collected experimental data. The testing programme includes long-term analysis of six BFRP concrete beams pretensioned to different prestress levels; namely, 20%, 30% and 40% of the ultimate tensile capacity of the bars. The monitored testing stages included initial tensioning of the bars, casting and curing of concrete, transfer of prestressing force to the concrete, long-term unloaded phase after transfer, sustained loading application, long-term sustained loading phase, unloading and final destructive testing, conducted in a controlled indoor environment. During all phases of the testing strain levels in the BFRP bars and deflections were continuously monitored. The results of continuous strain monitoring show that the average loss of strain over the period of initial 90 days of Journal of Composites for Construction unloaded monitoring was 7% of the initial strain. During the following 6 months of monitoring under sustained loading recorded an additional 0.3% reduction on average. The loss was dependent on the initial strain.

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“…Since improving the composite performance increases the production cost, improving the production technique of composites through fibre-prestressing is a possible way of mitigating the cost [ 9 ]. Fibre-prestressing has been discovered by researchers as a productive method of reducing the effect of residual stresses in composite materials during production [ 25 , 26 , 27 ].…”

Section: Fibre-prestressing Techniquementioning

confidence: 99%

A Review of Prestressed Fibre-Reinforced Polymer Matrix Composites

Ogunleye

Rusnáková

2021

Polymers

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This review examines various studies on reducing tensile stresses generated in a polymer matrix composite without increasing the mass or dimension of the material. The sources of residual stresses and their impacts on the developed composite were identified, and the different techniques used in limiting residual stresses were also discussed. Furthermore, the review elaborates on fibre-prestressing techniques based on elastically (EPPMC) and viscoelastically (VPPMC) prestressed polymer matrix composites, while advantages and limitations associated with EPPMC and VPPMC methods are also explained. The report shows that tensile residual stresses are induced in a polymer matrix composite during production as a result of unequal expansion, moisture absorption and chemical shrinkage; their manifestations have detrimental effects on the mechanical properties of the polymer composite. Both EPPMC and VPPMC have great influence in reducing residual stresses in the polymer matrix and thereby improving the mechanical properties of composite materials. The reports from this study provide some basis for selecting a suitable technique for prestressing as well as measuring residual stresses in composite materials.

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Long-term creep behavior of basalt fiber reinforced polymer bars

Cited by 27 publications

References 7 publications

Characterization of the Static, Creep, and Fatigue Tensile Behavior of Basalt Fiber/Polypropylene Composite Rods for Passive Concrete Reinforcement

Characterization of the Static, Creep, and Fatigue Tensile Behavior of Basalt Fiber/Polypropylene Composite Rods for Passive Concrete Reinforcement

Short- and Long-Term Prestress Losses in Basalt FRP Prestressed Concrete Beams under Sustained Loading

A Review of Prestressed Fibre-Reinforced Polymer Matrix Composites

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