Flexural behavior of reinforced concrete beam using CFRP hybrid system

Obaidat, Ala’ Taleb

doi:10.1080/19648189.2021.1934552

Cited by 17 publications

(8 citation statements)

References 22 publications

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“…The study utilized the embedded region constraint in the software ABAQUS 2017 to model the interaction between concrete and steel reinforcement by using the keyword “embed”, meaning that debonding was not considered. This method has been widely employed in finite element analysis on the behavior of reinforced concrete structures [ 44 , 45 , 46 , 47 ]. The model with the embedded region constraint does not need the input of the material properties of concrete and steel reinforcement.…”

Section: Methodsmentioning

confidence: 99%

Valorization of Vetiver Root Biochar in Eco-Friendly Reinforced Concrete: Mechanical, Economic, and Environmental Performance

Neve

Barhemat

et al. 2023

Materials

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Biochar has shown great promise in producing low-cost low-carbon concrete for civil infrastructure applications. However, there is limited research comparing the use of pristine and contaminated biochar in concrete. This paper presents comprehensive laboratory experiments and three-dimensional nonlinear finite element analysis on the mechanical, economical, and environmental performance of reinforced concrete beams made using concrete blended with biochar generated from vetiver grass roots after the roots were used in an oil extraction process. Both pristine biochar and biochar that were used to treat wastewater through adsorbing heavy metals (100 mg/L of Pb, Cu, Cd, and Zn) were investigated. The biochar was used to replace up to 6% Portland cement in concrete. Laboratory experiments were conducted to characterize the workability, mechanical properties, shrinkage, and leaching potential of the concrete blended with biochar. The results showed that using biochar could increase the compressive strengths and reduce the shrinkage of concrete without causing a leaching problem. The results from finite element analysis of the reinforced concrete beams showed that the use of biochar was able to increase the flexural performance of the beams as well as their economic and environmental performance. This research will promote the development and structural applications of low-cost low-carbon concrete.

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Section: Methodsmentioning

confidence: 99%

Valorization of Vetiver Root Biochar in Eco-Friendly Reinforced Concrete: Mechanical, Economic, and Environmental Performance

Neve

Barhemat

et al. 2023

Materials

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“…M is the consumption of building materials (kg), assuming that the consumption of gravel aggregates and bamboo aggregates is approximately 6.00 t each; and F is the carbon emission factor of building materials, obtained from GB/T 51366-2019 as 2.18 kg CO2e/t for gravel production [46]. Therefore, Csc of 6.00 t of gravel aggregate is 13.08 t CO2.…”

Section: Eds Chemical Composition Analysismentioning

confidence: 99%

Effects of surface modification methods on physical, mechanical, and microstructural properties of sustainable bamboo aggregate subjected to cementitious materials

Wei

Wang

et al. 2023

Preprint

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To alleviate the serious loss of gravel resources and improve the sustainability of concrete materials, this study innovatively proposes the development of a new type of bamboo aggregate from green and renewable Phyllostachys edulis (Moso) bamboo to replace traditional gravel aggregates. To realize the direct application of bamboo aggregates, this study proposes the use of epoxy mortar (EM) and polyurethane (PE) adhesives to modify the bamboo surface. Compared to unmodified and PE-modified bamboo, EM-modified bamboo showed significantly improved physical and mechanical properties. Durability tests revealed that the modified bamboo, especially EM-modified bamboo, was less affected by acidic and alkaline corrosion than the unmodified bamboo and the mass loss rate was almost zero. In the early stages of alkaline corrosion, the strength of the bamboo increased, and then began to decrease after 28 d. The removal of the outer green bamboo significantly improved the adhesion of the adhesive to the bamboo surface, as confirmed by pull-out tests. A sufficient bonding area between the EM-modified bamboo and the cement matrix remained after compression damage, whereas obvious debonding behavior between the cement matrix and unmodified and PE-modified bamboo was observed. In summary, EM modification significantly improved the comprehensive performance of bamboo aggregates. This study is expected to help improve the utilization rate of bamboo, promote bamboo concrete, reduce carbon emissions, and develop sustainable materials.

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“…The dilation angle of concrete is 328, the plastic potential eccentricity is 0.1, the ratio of the strength in the biaxial state to the strength in the uniaxial state is 1.16, the ratios of the distance between the hydrostatic axis and the compression meridian and the tension meridian, separately, in the deviatoric crosssection are both 0.667 and the viscosity parameter that defines viscoplastic regularization is 0 (Kmiecik and Kaminski, 2011). The bond between the steel reinforcement and concrete is assumed to be perfect, which is achieved by using the embedded-regions command available in the ABAQUS library Obaidat, 2021). The concrete stress-strain behavior under uniaxial compression is modeled using a stress-strain relationship proposed by Saenz's (1964) equation (Saenz, 1964;Obaidat et al, 2010Obaidat et al, , 2017Lam and Dai, 2010) (Figure 10).…”

Section: Numerical Simulationmentioning

confidence: 99%

Experimental and analytical investigation of using externally bonded, hybrid, fiber-reinforced polymers to repair and strengthen heated, damaged RC beams in flexure

Rjoub

Obaidat

Ashteyat

et al. 2021

JSFE

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PurposeThis study aims to conduct an experimental study and finite element model (FEM) to investigate the flexural behavior of heat-damaged beams strengthened/repaired by hybrid fiber-reinforced polymers (HFRP).Design/methodology/approachTwo groups of beams of (150 × 250 × 1,200) mm were cast, strengthened and repaired using different configurations of HFRP and tested under four-point loadings. The first group was kept at room temperature, while the second group was exposed to a temperature of 400°C.FindingsIt was found that using multiple layers of carbon fiber-reinforced polymer (CFRP) and glass fiber-reinforced polymer (GFRP) enhanced the strength more than a single layer. Also, the order of two layers of FRP showed no effect on flexural behavior of beams. Using a three-layer scheme (attaching the GFRP first and followed by two layers of CFRP) exhibited increase in ultimate load more than the scheme attached by CFRP first. Furthermore, the scheme HGC (heated beam repaired with glass and carbon, in sequence) allowed to achieve residual flexural capacity of specimen exposed to 400°C. Typical flexural failure was observed in control and heat-damaged beams, whereas the strengthened/repaired beams failed by cover separation and FRP debonding, however, specimen repaired with two layers of GFRP failed by FRP rupture. The FEM results showed good agreement with experimental results.Originality/valueFew researchers have studied the effects of HFRP on strengthening and repair of heated, damaged reinforced concrete (RC) beams. This paper investigates, both experimentally and analytically, the performance of externally strengthened and repaired RC beams, in flexure, with different FRP configurations of CFRP and GFRP.

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Flexural behavior of reinforced concrete beam using CFRP hybrid system

Cited by 17 publications

References 22 publications

Valorization of Vetiver Root Biochar in Eco-Friendly Reinforced Concrete: Mechanical, Economic, and Environmental Performance

Valorization of Vetiver Root Biochar in Eco-Friendly Reinforced Concrete: Mechanical, Economic, and Environmental Performance

Effects of surface modification methods on physical, mechanical, and microstructural properties of sustainable bamboo aggregate subjected to cementitious materials

Experimental and analytical investigation of using externally bonded, hybrid, fiber-reinforced polymers to repair and strengthen heated, damaged RC beams in flexure

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