Flexural Strength and Behavioral Study of High-Performance Concrete Beams using Stress-Block Parameters

Momin, Asif Iqbal A.; Khadirnaikar, R. B.; Zende, Aijaz Ahmad

doi:10.5829/ije.2021.34.11b.18

Cited by 3 publications

(4 citation statements)

References 15 publications

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“…Hence, strengthened rubber-concrete prisms in the shear-flexure zone with a lower surface of 50 mm of fiber-reinforced polymer, it was found that the type of failure in the flexural zone. Meanwhile, the behaviour of strengthened prism beams with both fiberreinforced polymer strip and lower surface of 100 mm is the highest compared to other prism beams, which is consistent with the results reported by previous researchers [22,23]. In other words, the failure rate in the shear zone was higher when the FRP external reinforcement was installed on the lower surface.…”

Section: External Fiber-reinforced Polymer Effect On Rubberized Concr...supporting

confidence: 91%

Enhancement of the Shear-flexural Strength of the Rubberized Concrete Prism Beam by External Reinforcement

2022

IJE

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It has become necessary to use damaged tires from various vehicles to produce rubberized concrete structures as a good solution to treat environmental pollution and reduce the total cost of construction. In general, concrete structures, for many reasons, may need to be strengthened. Recently, fiberreinforced polymer (FRP) sheets have been used to reinforce existing concrete structural elements that were deficient. FRP is an effective solution and is moderately common for strengthening and improving the properties of the structural element. Firstly, concrete mixes were poured with replaced sand, with the percentages varying from 0, 10, 20, and 30%. Thus, some mechanical properties in terms of the workability of concrete, compressive strength, tensile strength, and density of recycled concrete were studied using rubber from tires as an alternative to fine aggregate. Secondly, concrete prisms were poured with different proportions of rubber instead of sand. Twelve rubberized concrete prisms measure 100 mm x 100 mm x 600 mm. Then, the effect of fiber reinforced polymer with different forms on concrete prisms was investigated. The results revealed a decrease in the workability, density, and compressive strength of the rubber concrete samples with an increase in the proportions of replaced sand with rubber content. It is also observed that FRP improves the strength, stiffness, and ductility of all concrete prism beams with a different ratio of recycled rubber. In addition, the test results clearly show that the strengthening by width sheets of FPR behaved more favorably than the thin sheets having the same crosssection.

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Section: External Fiber-reinforced Polymer Effect On Rubberized Concr...supporting

confidence: 91%

Enhancement of the Shear-flexural Strength of the Rubberized Concrete Prism Beam by External Reinforcement

2022

IJE

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“…CA were made of crushed basalt stones with a specific gravity of 2.7. To enhance the strength, fly ash and silica fume were utilized as mineral admixtures, which helped to fill voids . Superplasticizer, along with a viscosity-modifying agent (VMA), was used to improve the workability and decrease the W/B ratio in the concrete .…”

Section: Experimental Programmentioning

confidence: 99%

“…To enhance the strength, fly ash and silica fume were utilized as mineral admixtures, which helped to fill voids. 21 Superplasticizer, along with a viscosity-modifying agent (VMA), was used to improve the workability and decrease the W/B ratio in the concrete. 22 To produce HSSCC with a strength of up to 90 MPa, a series of trial mix proportions were developed by varying the cement content, coarse aggregate content, fine aggregate content, and W/B ratio.…”

Section: Experimental Programmentioning

confidence: 99%

Mechanical Properties of High-Strength Self-Compacting Concrete

et al. 2023

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In this research work, the mechanical properties of high-strength self-compacting concrete (HSSCC) were studied. Three mixes were selected, having compressive strengths of more than 70, 80, and 90 MPa, respectively. For these three mixes, the stress–strain characteristics were studied by casting cylinders. It was observed during the testing that the binder content and water-to-binder ratio influence the strength of HSSCC, and slow changes in stress–strain curves were seen as the strength increased. The use of HSSCC results in reduced bond cracking, leading to a more linear and steeper stress–strain curve in the ascending branches as the strength of the concrete increases. Elastic properties such as modulus of elasticity and Poisson’s ratio of HSSCC were calculated using experimental data. In HSSCC, since the aggregate content is lower and the size of the aggregates is smaller, it will have a lower modulus of elasticity compared to normal vibrating concrete (NVC). Thus, an equation is proposed from the experimental results for predicting the modulus of elasticity of HSSCC. The results suggest that the proposed equation for predicting the elastic modulus of HSSCC for strengths ranging from 70 to 90 MPa is valid. It was also observed that the Poisson’s ratio values for all three mixes of HSSCC were found to be lower than the typical value for NVC, indicating a higher degree of stiffness.

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“…Designing HPC beams to withstand flexure can be a challenging task, as most standard codes and methods used for NSC cannot be applied to HSC. , To study the flexural behavior of higher-strength concretes, researchers have put forward stress block parameters and verified their experimental results, proposing substantial changes to current codes. − Stress block parameters have also been proposed for special types of concretes, such as geopolymer concrete (GPC). , However, it is unclear whether these parameters can be applied to HPC. While the ultimate strain of concrete recommended by the American code 441-R96 is 0.003, other codes such as EC-2, Canadian code, and IS Code limit it to 0.0035.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Flexural Behavior of a Two-Span High-Performance Concrete Beam Using Experimentally Derived Stress Block Parameters

et al. 2023

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High-performance concrete (HPC) is increasingly used in construction due to its superior strength and durability. However, current stress block parameters used for designing normal-strength concrete cannot be safely applied to HPC. To address this issue, new stress block parameters have been proposed through experimental works, which are used for designing HPC members. In this study, the behavior of HPC was investigated using these stress block parameters. Two-span beams made of HPC were tested under five-point bending, and an idealized stress block curve was derived from the experimental stress–strain curve for grades 60, 80, and 100 MPa. Based on the stress block curve, equations for the ultimate moment of resistance, depth of the neutral axis, limiting moment of resistance, and maximum depth of the neutral axis were proposed. An idealized load–deformation curve was also developed, which identified four significant events: first cracking, yielding of reinforced steel, crushing of concrete with spalling of cover, and ultimate failure. The predicted values were found to be in good agreement with the experimental values, and the average location of the first crack was identified to be 0.270 L, measured from the central support on either side of the span. These findings provide important insights for the design of HPC structures, contributing to the development of more resilient and durable infrastructure.

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Flexural Strength and Behavioral Study of High-Performance Concrete Beams using Stress-Block Parameters

Cited by 3 publications

References 15 publications

Enhancement of the Shear-flexural Strength of the Rubberized Concrete Prism Beam by External Reinforcement

Enhancement of the Shear-flexural Strength of the Rubberized Concrete Prism Beam by External Reinforcement

Mechanical Properties of High-Strength Self-Compacting Concrete

Investigating the Flexural Behavior of a Two-Span High-Performance Concrete Beam Using Experimentally Derived Stress Block Parameters

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