Concrete–fiber-reinforced polymer interfacial bond monitoring with self-triggering sensors

2018 ◽  
Vol 29 (12) ◽  
pp. 2557-2569
Author(s):  
Kunal Joshi ◽  
Marquese Pollard ◽  
Andrea Chiari ◽  
Tarik Dickens
Keyword(s):  
Bond Strength ◽  
Fiber Optic ◽  
Failure Detection ◽  
Polymer Materials ◽  
Fiber Reinforced Polymer ◽  
Fiber Optic Sensor ◽  
Fiber Reinforced Polymers ◽  
Sensor Technology ◽  
Fiber Reinforced ◽  
Reinforced Polymer

External bonding with fiber-reinforced polymers is currently one of the most popular technologies for rehabilitation of concrete structures. However, the effectiveness of the technology largely depends on the strength of the bond between the fiber-reinforced polymer laminate and the concrete substrate. This article provides a system to monitor the loss of bond between the fiber-reinforced polymer laminate and the concrete. Fiber optic sensors are broadly accepted as a structural health monitoring device for fiber-reinforced polymer materials by integrating the sensors into the host material. A recent development in fiber optic sensor technology is the mechanoluminescence-based optoelectronic sensors. Concrete beams strengthened with multifunctional fiber-reinforced polymer laminates were tested in shear using these sensors to evaluate the bond strength of the composite system. The sensors showed response to shear stress transfer in the adhesive layer which was observed to be as low as 2 MPa. The inclusion of sensors does not affect the bond strength (3.35 MPa), for both beams with sensors and without sensors. Real-time failure detection of fiber-reinforced polymer–strengthened beams was successfully achieved in this study. In future, the scheme aims at providing a tool to reduce the response time and decision making involved in the maintenance of deficient structures.

scholarly journals Investigation of Wooden Beam Behaviors Reinforced with Fiber Reinforced Polymers

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Şemsettin KILINÇARSLAN ◽  
Yasemin ŞİMŞEK TÜRKER
Keyword(s):  
Bearing Capacity ◽  
Polymer Materials ◽  
Fiber Reinforced Polymer ◽  
Bending Test ◽  
Fiber Reinforced Polymers ◽  
Bottom Surface ◽  
Fiber Reinforced ◽  
Reinforced Polymers ◽  
Reinforced Polymer ◽  
Over Time

Wood material can be demolished over time due to different environmental factors. Structural elements may need to be strengthened over time as a result of possible natural disasters or during use. Beams are elements under load in the direction perpendicular to their axes. Therefore, they are basically under the effect of bending. When the studies on the behavior of beams against bending test are examined, it is known that the bottom surface of the material generally breaks. For this reason, fiber reinforced polymers (FRP) materials have been used in recent years to reinforce beam members. It is a scientific fact that it is necessary to prefer FRPs for the solution of this problem, as well as their properties such as lightness, corrosion and flexibility, their application without disrupting the appearance of wood.In this study, it was aimed to investigate the effect of reinforcing wooden beams with fiber reinforced polymer materials with different properties on different bending behaviors such as load bearing capacity, ductility, modulus of elasticity. It was observed that the ductility and bearing capacity of wooden beams reinforced with fiber reinforced polymer materials increased significantly compared to non-reinforced beams.

scholarly journals Buckling Analysis of Pultruded Glass Fiber Reinforced Polymer (GFRP) Angle Sections

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2532
Author(s):  
Rahima Shabeen Sirajudeen ◽  
Rajesh Sekar
Keyword(s):  
Glass Fiber ◽  
Slenderness Ratio ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced Polymers ◽  
Fe Model ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced Polymer ◽  
Buckling Mode ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced

Glass fiber reinforced polymers (GFRP), with their advantage of corrosion resistance, have potential to be used as structural members in civil engineering constructions. Pultruded GFRP angle section trusses could be used instead of steel sections in remote areas and in areas prone to corrosion. The objective of this paper is to study the strength of GFRP angle sections under concentric axial load. Glass fiber reinforced polymer (GFRP) made of E-glass and Isophthalic polyester resin and manufactured by pultrusion process was used for the experimental study. Two GFRP angle sections of size 50 × 50 × 6 mm and 50 × 50 × 4 mm and lengths 500 mm, 750 mm, and 1000 mm were chosen for the study. Further, finite experimental element analysis of the GFRP angle sections was done using ANSYS software and validated with the experimental results. The validated FE model was used for parametric studies varying the slenderness ratio and flange width to thickness ratio (b/t) ratio. It was observed that length of the specimen and thickness influenced the buckling load and buckling mode. An increase in b/t ratio from 8.3 to 12.5 decreases the load carrying capacity by almost 60% at a slenderness ratio of 50.

Mechanical properties of fiber reinforced polymer composites: A comparative study of conventional and additive manufacturing methods

2018 ◽  
Vol 52 (23) ◽  
pp. 3173-3181 ◽  
Author(s):  
Kuldeep Agarwal ◽  
Suresh K Kuchipudi ◽  
Benoit Girard ◽  
Matthew Houser
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced Polymers ◽  
Manufacturing Processes ◽  
Fiber Reinforced ◽  
Reinforced Polymers ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Composite Filament

Fiber reinforced polymer composites have been around for many decades but recently their use has started to increase in multiple industries such as automotive, aerospace, and construction. The conventional composite manufacturing processes such as wet lay-up, resin transfer molding, automatic lay ups etc. suffer from a lot of practical and material issues which have limited their use. The mechanical properties of the parts produced by such processes also suffer from variation that causes problems downstream. Composites based additive manufacturing processes such as Fused Deposition Modeling and Composite Filament Fabrication are trying to remove some of the barriers to the use of composites. Additive manufacturing processes offer more design and material freedom than conventional composite manufacturing processes. This paper compares conventional composite processes for the manufacturing of Epoxy-Fiberglass fiber reinforced polymers with composite filament fabrication based Nylon-Fiberglass fiber reinforced polymers. Mechanical properties such as tensile strength, elastic modulus, and fatigue life are compared for the different processes. The effect of process parameters on these mechanical properties for the composite filament fabrication based process is also examined in this work. It is found that the composite filament fabrication based process is very versatile and the parts manufactured by this process can be used in various applications.

Alkali and temperature long-term effect on the bond strength of fiber reinforced polymer-to-concrete interface

2017 ◽  
Vol 52 (15) ◽  
pp. 2103-2114 ◽  
Author(s):  
Mahdie Mohammadi ◽  
Majid Barghian ◽  
Davood Mostofinejad ◽  
Adel Rafieyan
Keyword(s):  
Bond Strength ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Particle Image Velocimetry Technique ◽  
Reinforced Polymer ◽  
Long Term Effect ◽  
Image Velocimetry ◽  
Externally Bonded ◽  
Bond Characteristics

The effects of such environmental conditions as alkali media at temperatures of 23℃, 40℃, and 60℃ were investigated on the fiber reinforced polymer-to-concrete bond strength. For this purpose, 42 specimens were strengthened via the externally bonded reinforcement and the externally bonded reinforcement on grooves techniques. The specimens were later subjected to the single-shear test after the specified durations of exposure to an alkaline medium. The particle image velocimetry technique was used to investigate such bond characteristics of the strengthened specimens as load-slip behavior, strain profiles, and strain fields along the fiber reinforced polymer-to-concrete bond. Experimental results showed that the specimens strengthened via the externally bonded reinforcement on grooves method exhibited ultimate bond loads by up to 50% higher than those strengthened via the externally bonded reinforcement method.

scholarly journals Experimental Study on Bond Performance of Carbon- and Glass-Fiber Reinforced Polymer (CFRP/GFRP) Bars and Steel Strands to Concrete

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1268
Author(s):  
Jun Zhao ◽  
Xin Luo ◽  
Zike Wang ◽  
Shuaikai Feng ◽  
Xinglong Gong ◽  
...  
Keyword(s):  
Bond Strength ◽  
Bond Length ◽  
Retention Rate ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Bond Performance ◽  
Gfrp Bars ◽  
Reinforced Polymer ◽  
Gfrp Bar ◽  
Strength Retention

FRP bars and steel strands are widely used in civil engineering. In this study, three different types of high-strength reinforcement materials, carbon fiber reinforced polymer (CFRP) bar, glass fiber reinforced polymer (GFRP) bar, and steel strand, were investigated for their interfacial bond performance with concrete. A total of 90 sets of specimens were conducted to analyze the effects of various parameters such as the diameter of reinforcement, bond length, the grade of concrete and stirrup on the bond strength and residual bond strength. The results show that CFRP bars possess a higher bond strength retention rate than steel bars in the residual section. In addition, with the increase in bond length and diameter of the CFRP bar, the residual bond strength decreases, and the bond strength retention rate decreases. Furthermore, the bond strength retention rate of GFRP bars was found to be higher than that of CFRP bars. With the increase in grade of concrete, the bond strength and residual bond strength between GFRP bars and concrete increases, but the bond strength retention rate decreases. With an increase in bond length and diameter of the GFRP bar, the bond strength starts to decrease. Further, stirrup can also increase the bond strength and reduce the slip at the free end of GFRP bars. Moreover, the bond strength retention rate of the steel strand was found to be lower than CFRP and GFRP bar.

Seismic behavior of concrete bridge columns confined with fiber-reinforced polymer stay-in-place formwork

2017 ◽  
Vol 21 (4) ◽  
pp. 613-623 ◽  
Author(s):  
Gamal Elnabelsy ◽  
Murat Saatcioglu
Keyword(s):  
Carbon Fiber ◽  
Bridge Columns ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced Polymers ◽  
Carbon Fiber Reinforced Polymer ◽  
Experimental Program ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced ◽  
Polymer Tubes

One of the applications of fiber-reinforced polymers in bridge construction is stay-in-place formwork. Fiber-reinforced polymer stay-in-place formwork, in the form of preformed tubes, provides easy form assembly, protection of steel reinforcement and concrete against corrosion and chemical attacks while also improving the strength and ductility of structural elements in earthquake resistant construction. Experimental research was conducted to investigate the seismic performance of fiber-reinforced polymer stay-in-place formwork for bridge columns. Tests of large-scale specimens were conducted under simulated seismic loading. The experimental program included circular and square columns confined with carbon fiber–reinforced polymer tubes. The results indicate that the use of carbon fiber–reinforced polymer tubes increases column inelastic deformability significantly. Bridge columns under low levels of axial compression exhibit inelastic drift capacities in excess of 4% before failing in flexural tension due to the rupturing of longitudinal reinforcement. These observations and experimental results were used to develop a displacement-based design procedure for concrete confinement for fiber-reinforced polymer–encased concrete columns. This article presents an overview of the experimental program and the design approach developed.

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