Fibrous geopolymer paste composites for near-surface-mounted strengthening of reinforced concrete beams in flexure

Salman, Wissam D.; Mansor, Ahmed Abdullah

doi:10.1016/j.cscm.2021.e00529

Cited by 16 publications

(10 citation statements)

References 9 publications

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“…It was clear that, compared to A-1 and B-1, the ultimate load decreased respectively by 40% and 40,6% for APH6 and BPH6. This can be attributed to the deference between the ultimate load on the steel bars and steel plates, where the steel bar was stronger than the previous one [14]. Furthermore, the ultimate load of the B-2 specimen was 42.06% higher than A-1.…”

Section: Ultimate Loadmentioning

confidence: 93%

Effect of Replacing the Main Reinforcement by Sheet Steel Plate in Reinforced Concrete Beams

Ibrahim

Mansor

Noman

et al. 2021

DJES

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In recent years, new methods have developed utilizing steel plates instead of deformed steel bar reinforcement in the concrete beams. This paper presents the utilization of a new proposed approach for replacing the main flexural reinforcement concrete beams by steel checker plates of (6mm) thickness. Four reinforced concrete beams were cast and tested under two-point load. All beams had the same cross-sectional area of reinforcement and the dimensions of 210 cm in length, 35 cm in height and 25cm in width. The result show there was a reduction in crack load, yield load, and ultimate load of steel plate as compared to steel bar, Whereas increased with increasing cross-sectional area of the steel. Once, the increment in crack load and yield load of steel plate were 25.5% and 16,67% more than steel bar whereas the same increment was found in ultimate load for both steel bar and steel plate. The measured crack load and ductility for steel plate was 16.7% more than steel bar when increasing cross-sectional area of steel. The deflection past of failure for steel plate has a considerable deflection before failure than steel bar. Finally, the observations show cracks have been much wider and less in range for all steel plate samples in comparison with the steel bar.

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Section: Ultimate Loadmentioning

confidence: 93%

Effect of Replacing the Main Reinforcement by Sheet Steel Plate in Reinforced Concrete Beams

Ibrahim

Mansor

Noman

et al. 2021

DJES

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“…Three types of discrete fibers have been added to geopolymer adhesive, to develop the bonding properties of the geopolymer adhesive between the carbon fiber fabric layers that was obtained from a commercial supplier in Baghdad. The fibers used are shown in Figure (1). The first type is the micro steel fiber (SF), that commonly used in concrete mixtures because of its ability to improve fatigue resistance, shear, and flexural strength.…”

Section: Discrete Fibersmentioning

confidence: 99%

“…Structures in the world need to rehabilitate and strengthen the cause of their deterioration resulting from actual use, aging, and exposure to various environmental conditions or modernization in proportion to the requirements of age [1]. An important component that needs rehabilitation is RC columns, being subject to combinations of axial stress and bending moment.…”

Section: Introductionmentioning

confidence: 99%

Fibrous Geopolymer Adhesive Jackets for Confining of Reinforced Concrete Columns

Salman¹,

Salman²

2021

DJES

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The strengthening and rehabilitation of reinforced concrete structures is an important issue all over the world. Fiber-reinforced composites (FRC) are mainly used for the strength and rehabilitation of concrete members. However, its use is limited due to its high price and environmental effects and its adoption of epoxy as an adhesive, where epoxy is considered inefficient at high temperatures and loses most of its properties. The solution to this problem leads to the use of low-cost locally available geopolymer adhesive paste, with the possibility of adding fibers to improve the mechanical properties. This paper presents the experimental results of the circular RC columns confined by carbon fiber reinforced geopolymer adhesive (CFRGA) with fibers at geopolymer adhesive (GPA). Variables included; Geopolymer adhesive with or without fibers and type of fiber added to GPA (micro steel fibers, carbon fibers, and polypropylene fibers) with the volumetric ratio of (2%, 0.4%, 0.2%), respectively. The results where it was found that confinement by carbon fiber reinforced fibrous geopolymer adhesive improved the columns compressive strength estimated by (215%) and the axial strain improved by (268%). When adding (micro steel fibers, carbon fibers, and polypropylene fibers) to the adhesive led to an improvement in the strength of about (16.1%, 8.4%, and 7.96%) respectively, compared with the confined RC column without fibers at (GPA). Finally, confinements by carbon fiber reinforced geopolymer adhesive are more suitable for use in strengthening and rehabilitation of RC columns in areas with a hot climate.

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“…It is apparent that the ultimate load decreased by 36, 40, and 33% for APV4, APV5, and APV6, respectively, as compared with A-1. This decrease may be resulted from the difference between the ultimate load of the steel plate and reinforced steel bars, where the latter has higheryielding strength than the former [14]. 7 and noticed that the ductility of A-1, APV4, APV5, and APV6 increased by 1.63, 2.65, 4.67, and 4.43, respectively, compared with A-1.…”

Section: Beam Specimens Width (Mm) Thickness (Mm) Aspect Ratiomentioning

confidence: 99%

Effect of Using Different Aspect Ratio of Longitudinal Steel Plates in Reinforced Concrete Beams

et al. 2021

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In the past few years, new techniques have emerged using steel plates instead of traditional reinforcement in the reinforced concrete beams. This study deals with using a new method for reinforced concrete beams using steel plates instead of traditional steel bars with different thicknesses of (4, 5, and 6 mm) placed vertically inside the lower part of the beam. Four reinforced concrete beams were cast and tested under a two-point load. All beams had the same cross-sectional area of reinforcement and dimensions of 2100 mm in length, 350 mm in height, and 250 in width. The results showed that as the thickness of the steel plate increases, the samples would have greater resistance until more deflection is produced. In addition, there is a reduction in the crack load, ultimate load, and yield load when replacing reinforcing bars with steel plates. In which, a reduction in crack load by about 11.1, 15.5, and 22.2% plate thicknesses of 4,5,6 mm respectively, compared to reference beam that had a deformed steel bar (Dia. 16 mm). In addition, a reduction in yielding load was observed about 42, 53, and 60% for steel plate thickness of 4, 5, and 6 mm respectively, compared to the reference model. Finally, the cracks for all the steel plate specimens compared to reference specimens were wider and smaller.

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Fibrous geopolymer paste composites for near-surface-mounted strengthening of reinforced concrete beams in flexure

Cited by 16 publications

References 9 publications

Effect of Replacing the Main Reinforcement by Sheet Steel Plate in Reinforced Concrete Beams

Effect of Replacing the Main Reinforcement by Sheet Steel Plate in Reinforced Concrete Beams

Fibrous Geopolymer Adhesive Jackets for Confining of Reinforced Concrete Columns

Effect of Using Different Aspect Ratio of Longitudinal Steel Plates in Reinforced Concrete Beams

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