Shear strengthening of reinforced concrete beam using natural fibre reinforced polymer laminates

Alam, Ashraful; Riyami, Khalid Al

doi:10.1016/j.conbuildmat.2017.12.011

Cited by 99 publications

(43 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because the RC beam designed in this study has a one-side arrangement of stirrups, the damage of RC-FRP 1, RC-FRP-3 and RC-FRP-5 occurs on the side without the vertical steel bars. This is in agreement with previous research results [25][26][27]. The force equation for an RC beam without web steel bars, which considers the influence of the vertical steel bars on the shear behavior of the RC beam is shown in Equation (1) below [28].…”

Section: Shear Capacity Model Of Rc Beams Reinforced With Flax Fiber supporting

confidence: 91%

Shear Capacity of RC Beams Strengthened with Flax Fiber Sheets Grafted with Nano-TiO2

Wang

Xian

2020

Materials

View full text Add to dashboard Cite

Flax fiber sheets provide the advantages of high specific strength, a short growth cycle, environmental friendliness, wide availability, and low cost. Therefore, in this study, the shear capacities of reinforced concrete (RC) beams strengthened with ordinary flax fiber sheets, flax fiber sheets grafted with nano-TiO 2 , and unidirectional basalt fiber sheets were compared. The bearing characteristics and failure modes of RC beams strengthened with flax fiber sheets were investigated. The results showed that after reinforcement with flax fiber sheets, the bearing capacity and mid-span deflection of the RC beams are considerably improved, and the reinforcing effect of flax fiber sheets grafted with nano-TiO 2 is greater than that of unmodified flax fiber sheets. After reinforcement with flax fiber sheets grafted with nano-TiO 2 , the shear capacity of the RC beams is considerably improved to 653 kN, which is 72.8% higher than that of the unreinforced RC beams. Meanwhile, the mid-range deflection of the beam reached 14.6 mm, which is 75.9% higher than that of the unreinforced RC beams.surface morphology of the flax fiber sheets, but it can also transform the hydrophilic surface into a lipophilic surface, which improves the compatibility of the flax fiber monofilament with epoxy resin [15,16]. After grafting, a nanoparticle layer structure is produced on the surface of the flax fiber. This can create new covalent bonds, such as -Ti-O-Si-and -Si-O-C-. The degree of defects on the surface of the flax fiber sheets is reduced, and a nano-reinforced epoxy resin composite layer is formed between the flax fiber sheets and the epoxy resin, which fully exerts the reinforcing effect of the nano-TiO 2 [15,17].In this study, the shear capacity, bearing characteristics, and failure modes of reinforced concrete (RC) beams and RC beams strengthened with ordinary flax fiber sheets, unidirectional basalt fiber sheets, and flax fiber sheets grafted with nano-TiO 2 were analyzed and compared. An equation for the shear bearing capacity of RC beams strengthened with flax fiber sheets was also proposed. Materials and Methods Materials and ReagentsThe RC beam was cast with commercial concrete. The concrete grade was C30, water-cement ratio was 0.42, and ratio of cement:water:sand:gravel was 360:151:632:1282 by weight. The cement was Swan brand P.O grade 42.5 ordinary Portland cement, produced by the Harbin Cement Factory of the Jilin Yatai Group, China. The maximum particle size of the coarse aggregate was approximately 25 mm. The measured concrete slump was 43 mm [18]. After pouring was completed, the RC beam was continuously watered at room temperature for 7 days, after which it was removed from the mold and rinsed until 28 days. According to the requirements in the standards for the test of mechanical properties of ordinary concrete (GB/T 50081-2011) [18], the compressive strength of the concrete cube (100 mm × 100 mm) was measured to be 38.2 ± 0.3 MPa.The vertical, structural, and erecting steel rebars were HRB400 grade ordinary hot ro...

show abstract

Section: Shear Capacity Model Of Rc Beams Reinforced With Flax Fiber supporting

confidence: 91%

Shear Capacity of RC Beams Strengthened with Flax Fiber Sheets Grafted with Nano-TiO2

Wang

Xian

2020

Materials

View full text Add to dashboard Cite

show abstract

“…Three reinforced concrete beam specimens with the dimension of 150 mm × 300 mm × 2,300 mm were prepared for experimental investigations. One was prepared as control specimen and another two were strengthened for shear using [12], [13]. The current study is planned to investigate flexural response of reinforced concrete beams strengthened using natural jute fiber and basalt fibers.…”

Section: Introductionmentioning

confidence: 99%

Flexural Response of JFRP and BFRP Strengthened RC Beams

Joyklad¹,

Suparp²,

Hussain³

2019

IJET

View full text Add to dashboard Cite

In the last few decades, many studies have been conducted on the flexural strengthening of reinforced concrete (RC) beams using different strengthening techniques such as concrete, steel and artificial fiber reinforced polymer composites (FRP). Among artificial FRPs, mainly glass, carbon and aramid fibers have been considered extensively. This study presents an experimental investigation on the flexural strengthening of small scale RC beams using natural fibers such as jute fiber reinforced polymer composites (JFRP) and basalt fiber reinforced polymer (BFRP) composites. A total number of five RC beams were constructed and tested under three point bending loading scheme to investigate the flexural response of both un-strengthened and FRP strengthened RC beams. Two types of strengthening techniques were adopted to strengthen RC beams. In strengthening technique A, the fiber was applied only at the tension side of the RC beams whereas in strengthening technique B, the fiber was applied both at sides and at the bottom in the form of U shape. The results indicate that use of both strengthening materials such as JFRP and BFRP is very effective to enhance ultimate load carrying capacity of RC beams. Further it was found that strengthening technique B is more efficient as compared with the strengthening technique A.

show abstract

“…The 25 % fiber content showed the highest tensile strength of KFRP laminate as compared to other mix ratios without showing honeycombs and air voids. The tensile strength of KFRP laminate with 25 % fiber content was found to be 119.6 MPa which was 2.7 times higher as compared to epoxy laminate without kenaf fiber [14].…”

Section: Introductionmentioning

confidence: 87%

“…Md. Ashraful Alam et al 2018 investigated the possibility to use the kenaf fiber reinforced polymer laminate for shear strengthening of reinforced concrete structures. For strengthening of RC beam, KFRP laminate shear strips were fabricated with 25 % fiber content.…”

Section: Introductionmentioning

confidence: 99%

Shear Strengthening of RC Beams Using Polyester Rope

Suparp¹,

Joyklad²,

Hussain³

2019

IJET

View full text Add to dashboard Cite

This paper presents an experimental investigation on the shear strengthening of reinforced concrete (RC) beams using polyester rope (PR). A total of five small scale RC beams were cost and tested under four point bending scheme. One beam was tested as un-strengthen to serve as a control beam whereas remaining four beams were strengthened using polyester rope prior to the test. PR was applied in the shear critical region using two different kinds of configurations such as configuration A and B. In the configuration A, the PR was applied in the form of strips whereas in configuration B, the PR was applied over the whole shear critical region of beams. Further in both strengthening configurations, the PR was applied in two different thicknesses i.e., one layer and three layers. The experimental results indicate that use of PR is every effective to alter the response of RC beams and to enhance the shear strength of RC beams. There is found increase in load carrying capacity with an increase in the PR thickness. It was also observed that strengthening configuration B is superior to the strengthening configuration A in terms of ultimate load carrying capacity of RC beams.Index Terms-Reinforced concrete, shear strengthening, polyester rope, epoxy resin, ultimate load carrying capacity. Suniti Suparp is an associate professor with the

show abstract

Shear strengthening of reinforced concrete beam using natural fibre reinforced polymer laminates

Cited by 99 publications

References 22 publications

Shear Capacity of RC Beams Strengthened with Flax Fiber Sheets Grafted with Nano-TiO2

Shear Capacity of RC Beams Strengthened with Flax Fiber Sheets Grafted with Nano-TiO2

Flexural Response of JFRP and BFRP Strengthened RC Beams

Shear Strengthening of RC Beams Using Polyester Rope

Contact Info

Product

Resources

About