Effect of Platen Restraint on Stress–Strain Behavior of Concrete Under Uniaxial Compression: a Comparative Study

Kumar, S. Phani; Mukhopadhyay, T.; Waseem, Shakeel Ahmad; Singh, Bhupinder; Iqbal, M.A.

doi:10.1007/s11223-016-9802-z

“…This behavior was also observed in other studies [37]. The authors believe this phenomenon was caused by the circumferential restraint due to end zone friction when the concrete cylinder is under compression [39,40]. To investigate the time window effects on measurements of acoustoelastic coefficients, a moving time window with a width of 0.2 ms was used for stretching technique analysis.…”

Section: Concrete Subject To Uniaxial Stresssupporting

confidence: 67%

Applications of Stretching Technique and Time Window Effects on Ultrasonic Velocity Monitoring in Concrete

Zhong

¹

,

Zhu

²

2022

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Coda wave interferometry (CWI) has been used to measure the relative wave-velocity change (dV/V) caused by small changes in materials. This study uses the stretching processing technique which has been used for CWI analysis to investigate velocity changes of direct longitudinal (P) wave, direct shear (S) wave, and coda wave in concrete by choosing different time windows of ultrasonic signals. It is found that the obtained wave-velocity change depends on the time window position, because the relative contribution of P wave and S wave is different in each signal window. This paper presents three experimental scenarios of velocity change in concrete: early-age hydration, temperature change, and uniaxial loading. In early-age concrete, the S wave has a larger relative velocity change than the P wave, which is consistent with the microstructure development due to the hydration process. Temperature change causes a larger dV/V on the P wave than on the S wave, and the difference between P and S wave-velocity changes may be used to determine nonlinear elastic constants of materials. In the uniaxial loading experiment, analysis of the direct P wave can distinguish the acoustoelastic effects in the stress direction and the non-stress direction, which may potentially be used for stress evaluation in prestressed structures. However, the coda wave does not show this directional property to stress due to multiple scattering in the medium.

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“…The steel plate used in concrete has to be pre-bent to the required radius since the material can follow a curved profile. Similarly, the material fibers and resins are durable, and it requires little maintenance if it is correctly specified [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Enhancing PVCC beam performance through PVA fiber and basalt fabric in sustainable construction: ductility, strength, and energy absorption improvements

Prasanthni,

Priya,

Palanisamy

et al. 2024

Matéria (Rio J.)

3

0

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This study evaluates the performance of PVCC (Polyvinyl Alcohol Cementitious Composite) layered beams (BP1 to BP5), basalt fiber fabric-wrapped beams (BB1 and BB2), and a control beam (B0). Results show that specimen BP3, with 1.2% PVA fiber in PVCC layered beam, and BB2, with basalt fiber fabric wrapped at the bottom up to the neutral axis, exhibit superior performance. BP3 delays first crack initiation, increases the ultimate load-carrying capacity by 19.87%, and achieves a remarkable 54.57% increase in maximum ductility compared to B0. BP3 also demonstrates 54.54% higher stiffness and notable energy absorption. Similarly, BB2 outperforms BB1 and B0 in first crack load, ultimate load carrying capacity, ductility, stiffness, energy absorption, and energy index. BB2 exhibits 2.10 times increase in ductility compared to B0. Incorporating PVA fiber in PVCC layered beams and basalt fiber fabric wrapping offers better improvements in crack resistance, load capacity, ductility, stiffness, and energy absorption, contributing to innovative and sustainable beam design in construction.

show abstract

“…The steel plate used in concrete has to be pre-bent to the required radius since the material can follow a curved profile. Similarly, the material fibers and resins are durable, and it requires little maintenance if it is correctly specified [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Development of lightweight aggregates from coffee grounds and rice husk ash

Aguiar,

Souza,

Farias

2024

Matéria (Rio J.)

1

0

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This study evaluates the performance of PVCC (Polyvinyl Alcohol Cementitious Composite) layered beams (BP1 to BP5), basalt fiber fabric-wrapped beams (BB1 and BB2), and a control beam (B0). Results show that specimen BP3, with 1.2% PVA fiber in PVCC layered beam, and BB2, with basalt fiber fabric wrapped at the bottom up to the neutral axis, exhibit superior performance. BP3 delays first crack initiation, increases the ultimate load-carrying capacity by 19.87%, and achieves a remarkable 54.57% increase in maximum ductility compared to B0. BP3 also demonstrates 54.54% higher stiffness and notable energy absorption. Similarly, BB2 outperforms BB1 and B0 in first crack load, ultimate load carrying capacity, ductility, stiffness, energy absorption, and energy index. BB2 exhibits 2.10 times increase in ductility compared to B0. Incorporating PVA fiber in PVCC layered beams and basalt fiber fabric wrapping offers better improvements in crack resistance, load capacity, ductility, stiffness, and energy absorption, contributing to innovative and sustainable beam design in construction.

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Effect of Platen Restraint on Stress–Strain Behavior of Concrete Under Uniaxial Compression: a Comparative Study

Cited by 16 publications

References 10 publications

Applications of Stretching Technique and Time Window Effects on Ultrasonic Velocity Monitoring in Concrete

Applications of Stretching Technique and Time Window Effects on Ultrasonic Velocity Monitoring in Concrete

Enhancing PVCC beam performance through PVA fiber and basalt fabric in sustainable construction: ductility, strength, and energy absorption improvements

Development of lightweight aggregates from coffee grounds and rice husk ash

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