Shear behaviour of high strength self-compacting concrete with varying stirrup spacing

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

doi:10.1504/ijstructe.2022.126192

Cited by 3 publications

(6 citation statements)

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“…This behavior has been observed by numerous researchers in the study of high-strength beams, as documented in previous research papers. 28,29 However, for beam specimens 80DB1 and 80DB2, the final failure was due to shear cracks that developed at the supports.…”

Section: Crack Propagation Figures 13−15mentioning

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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Section: Crack Propagation Figures 13−15mentioning

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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“…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 . 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%

“… 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. All mixes were evaluated to ensure that they met the characteristics of SCC as per the guidelines set by EFNARC.…”

Section: Experimental Programmentioning

confidence: 99%

“…Numerous research works have been undertaken to analyze the mechanical properties of HSSCC, including but not limited to stress–strain behavior, elastic modulus, and Poisson’s ratio. − These studies have shown that the binder content, W/B ratio, and type and size of aggregates used in the mixes significantly influence the mechanical properties of HSSCC. Zende et al investigated the stress–strain characteristics of SCC and compared them with those of normal concrete. The study found that SCC exhibited higher compressive strength and elastic modulus compared to normal vibrating concrete (NVC), as well as a lower rate of strain at peak stress.…”

Section: Introductionmentioning

confidence: 99%

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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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“…Okamura was the first to develop self-compacting concrete (SCC) in 1986 [8]. Several significant studies have been published on the structural shear behavior and performance of RC structures built using SCC [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Behavior of Self Compacted Concrete Deep Beams Reinforced With Polypropylene Fibers

Shoeib

Abdel-Ghaffar

Ibrahim

et al. 2023

Engineering Research Journal - Faculty of Engineering (Shoubra)

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Self-compacting concrete (SCC) is one of the most recent high-performance concrete innovations. The behavior of self-compacted concrete deep beams reinforced with polypropylene fibers herein investigated. Within an experimental program comprising thirteen simply supported beams tested to failure. The parameters in perspective are polypropylene fiber ratios (0.0, 0.30, 0.60, and 0.90 %), vertical web reinforcement, and horizontal web reinforcement. Mid-span deflection, cracks, and strains are measured for each specimen. According to the test results, the polypropylene fibers improved the cracking load, ultimate capacity, displacement, and energy absorption of the tested SCC deep beams. A polypropylene fiber content of 0.90 % resulted in the most significant improvement as regards the performance of deep beams. The improvement in ultimate capacity reached a 30% magnitude compared to specimen B1. Test results showed that both vertical and horizontal web reinforcement are effective in enhancing the shear capacity of SCC deep beams. The test results were compared with the ACI design method to show the impact of web reinforcement ratio on deep beam load capacity.

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Shear behaviour of high strength self-compacting concrete with varying stirrup spacing

Cited by 3 publications

References 0 publications

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

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

Mechanical Properties of High-Strength Self-Compacting Concrete

Behavior of Self Compacted Concrete Deep Beams Reinforced With Polypropylene Fibers

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