The flexural behavior of nano concrete and high strength concrete using GFRP

Erfan, Abeer M.; Hassan, Hossam El-Deen; Hatab, Khalil M.; El-Sayed, Taha A.

doi:10.1016/j.conbuildmat.2020.118664

Cited by 36 publications

(8 citation statements)

References 8 publications

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“…The hardness of glass crumb also causes more adhesion to concrete. By adding 10% of micro-silica to the mixing plans, there has been a great increase in bending strength and this is consistent with previous research (27,30). This increase in bending strength in the B-GF-6 beam is 36% compared to the reference beam and 16% compared to the B-GF-3 beam, which contains the same plan without micro-silica.…”

Section: Ultimate Bending Forcesupporting

confidence: 90%

“…In contrast, the addition of a high percentage of crumb rubber (more than 15%) showed a significant decrease in ductility, toughness, first crack moment and ultimate bending capacity of the tested beams. Erfan et al (27) investigated the bending behavior of concrete beams reinforced with GFRP polymer rebars in mixtures of nano-silica concrete and highstrength concrete. The results show that the breaking and displacement loads of beams reinforced with GFRP rebars have increased by 22% and 6.5 times, respectively, compared to beams with steel rebars and concrete containing nano-silica.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of the behavior of concrete beams containing recycled materials reinforced with composite rebars

Jafari,

Alizadeh Elizei,

Ziaei

et al. 2023

materconstrucc

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The application of various Fiber Reinforced Polymer (FRP) composite materials is very widespread in the world. The use of recycled materials in concrete, can improve some of the mechanical properties of concrete. In this laboratory research, the behavior of reinforced concrete beams with composite rebars with glass fibers made of concrete containing recycled materials such as glass, rubber and micro-silica with different mixing plans has been investigated. These mixing plans are such that recycled glass and rubber aggregates have replaced a percentage of fine and coarse concrete aggregates, and glass powder and micro-silica have also replaced a percentage of concrete cement. The results showed that the replacement of coarse rubber, glass powder, and micro-silica in concrete materials increases the bending strength and ductility of concrete beam. In examining the microstructure of concrete by Scanning Electron Microscope (SEM) the adhesiveness of the rubber Interfacial Transition Zone (ITZ) in concrete was suitable.

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Section: Ultimate Bending Forcesupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the behavior of concrete beams containing recycled materials reinforced with composite rebars

Jafari,

Alizadeh Elizei,

Ziaei

et al. 2023

materconstrucc

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“…Ultrafine powders, represented by nanomaterials, are a new material used for the modification of concrete 9 , 10 . The mechanical and deformation properties of concrete may be improved effectively after adding the nanomaterials into its matrix 11 , 12 .…”

Section: Introductionmentioning

confidence: 99%

Effect of nano-SiO2 and nano-CaCO3 on the static and dynamic properties of concrete

Wang

Bai

et al. 2022

Sci Rep

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Three kinds of nano-concrete, i.e., 2.0% nano-SiO2 doped, 2.0% nano-CaCO3 doped and 1.0% nano-SiO2-1.0% nano-CaCO3 co-doped concretes (NS, NC, NSC) were prepared for a study on static property and dynamic property under different strain rates (50–130 s−1) using HYY series hydraulic servo test system and Φ100 mm split Hopkinson pressure bar test system, and a comparison with plain concrete (PC) as well. The results have shown that under static load, as compared with PC, NC has both strength and elastic modulus increased obviously, while NS has strength decreased and elastic modulus increased, and under dynamic load, there is an obvious strain rate effect for the dynamic compressive strength, impact toughness, energy dissipation and impact failure mode of concrete. Under the same strain rate, the dynamic compressive strength, peak strain, impact toughness and energy dissipation of NC are significantly increased, while its dynamic elastic modulus is decreased. Compared with PC, NS has dynamic compressive strength, peak strain, impact toughness and energy dissipation decreased, and dynamic elastic modulus increased, NC has static and dynamic mechanical properties improved, NS has static and dynamic mechanical properties weakened, and NSC is between PC and NC in static and dynamic mechanical properties, but generally improved. Doped with nano-CaCO3, NC has compactness improved, weak areas reduced, and pore size distribution optimized, while doped with nano-SiO2, NS has obvious internal weak areas, with pore structure degraded.

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“…This was because NS improved the bond strength between SF and the cement, resulting in improved SF crack resistance. The flexural behavior of beams constructed with NS high-strength concrete and reinforced with glass fiber (GFRP) bars was experimentally examined [ 12 ]. It was concluded that concrete beams manufactured with NS had enhanced flexural behavior and decreased flexure cracks, in both number and width.…”

Section: Introductionmentioning

confidence: 99%

Shear Strength of Nano Silica High-Strength Reinforced Concrete Beams

El-Mandouh

Kaloop

et al. 2022

Materials

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In this study, the shear strength of sixteen full-scale over-reinforced concrete beams with and without nano silica (NS), constructed from high-strength concrete (HSC), was investigated both experimentally and analytically. Nano silica was used as a partial replacement for Portland cement. According to the NS ratio, the tested beams were divided into four groups: 0%, 1%, 2%, and 3%. Shear span to effective depth (a/d) ratios of 1.5 and 2.5 were used in each group, and two different stirrups ratios (ρv) were employed as 0% and 0.38%. The shear strength provisions used by some international codes, such as the American Concrete Institute (ACI-2019), the Eurocode 2 (EC-2), and the Egyptian Code (ECP 207), were examined when applied to HSC beams with and without NS. The most important factors to consider were the effect of using NS on the shear span to effective depth (a/d) ratio and the shear strength of the beams with and without stirrups. The experimental results were validated using a nonlinear finite element analysis using the computer program ABAQUS. The experimental results showed that increasing the NS ratio reduced the number of cracks, and increased the cracks spacing, as well as reducing crack width. In specimens without stirrups, these effects were more obvious. A rise in the (a/d) ratio increased the number of cracks along the beam length, notably in the mid-span region. For specimens without stirrups and with an (a/d) of 1.5, raising NS from 0% to 1%, 2%, and 3% increased the ultimate load by 13%, 30%, and 39%, respectively, whereas for specimens with an (a/d) of 2.5, the ultimate load increased with approximately the same increase as that in beams with an (a/d) of 1.5 due to using NS. Additionally, the addition of NS to concrete boosted the contribution of the concrete to the shear strength, as shown by the results of beams without stirrups. For specimens with stirrups and an (a/d) of 1.5, raising NS from 0% to 1%, 2%, and 3% increased the ultimate load by 8%, 21%, and 30%, respectively. Additionally, for specimens with stirrups and an (a/d) of 2.5, the ultimate load increased with approximately the same increase as that in beams with stirrups and an (a/d) of 1.5 due to using NS. The test findings indicate that the shear strength calculated using the equations of the ACI 318-19 is more conservative than EC-2 and ECP 207 for NS concrete beams. The finite element program ABAQUS may be successfully used to predict the shear strength of NS concrete beams.

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The flexural behavior of nano concrete and high strength concrete using GFRP

Cited by 36 publications

References 8 publications

Experimental investigation of the behavior of concrete beams containing recycled materials reinforced with composite rebars

Experimental investigation of the behavior of concrete beams containing recycled materials reinforced with composite rebars

Effect of nano-SiO2 and nano-CaCO3 on the static and dynamic properties of concrete

Shear Strength of Nano Silica High-Strength Reinforced Concrete Beams

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