Performance of Reinforced Concrete Beam with Polystyrene Blocks at Various Regions

Tat, Lim Yong

doi:10.31328/jsae.v3i2.1655

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…This makes the growth and enlargement of cracks notably fast [16]. • Removing concrete from slabs reduces the slab's moment of inertia [16,26]. This affects the ability of the member to resist bending [26].…”

Section: Reference Sphere Cuboid Cube Donut Ellipsoid Cylinder Mushro...mentioning

confidence: 99%

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Behaviour of Reinforced Concrete Slabs with Embedded Polystyrene Spheres

Ling,

Lau,

Lim

2024

Civil Sustain. Urban Eng.

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Polystyrene spheres can be used to substitute concrete in reinforced concrete slabs. Despite the weight, the structural performance of the slab would also be affected. This study investigated the behaviour of slabs containing polystyrene spheres under loads. Six specimens were fabricated and tested under the four-point load setup. The parameters studied included the diameters of the polystyrene spheres and the spacing between them. The polystyrene spheres reduced the slabs’ first crack load, stiffness, yield strength, and ultimate strength. The first crack, yield, and ultimate loads decreased by 22.3%, 2.1%, and 4.1%, respectively, when the polystyrene sphere’s diameter increased from 75 mm to 125 mm. As the polystyrene spheres’ spacing decreased from 50 mm to 10 mm, the first crack, yield, and ultimate loads dropped 14.2%, 9.2%, and 7%, respectively. Despite some limitations identified during the feasibility analysis, specimen SP3 was found feasible as a simply supported one-way spanning slab. In the specimen, the polystyrene spheres were 0.625 times the slab thickness in diameter and 2.5 times the concrete cover in spacing.

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Section: Reference Sphere Cuboid Cube Donut Ellipsoid Cylinder Mushro...mentioning

confidence: 99%

“…• Removing concrete from slabs reduces the slab's moment of inertia [16,26]. This affects the ability of the member to resist bending [26]. • The voids near the reinforcements remove the concrete around them.…”

Section: Reference Sphere Cuboid Cube Donut Ellipsoid Cylinder Mushro...mentioning

confidence: 99%

Behaviour of Reinforced Concrete Slabs with Embedded Polystyrene Spheres

Ling,

Lau,

Lim

2024

Civil Sustain. Urban Eng.

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“…It seems that the beam loses more strength than the weight reduction. Nevertheless, since the principles between beam and slab are quite identical, it could be possible to develop a lightweight beam by reducing some concrete at the neutral axis and tension region (Lim et al, 2020). Successful weight reduction with comparable strength as the solid beam may reduce the construction cost.…”

Section: Introductionmentioning

confidence: 99%

Improvement in the Reinforced Concrete Beam with Embedded Polystyrene under Static Load

Tat,

Ling,

Sia

et al. 2023

IJoCED

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Reinforced concrete beam is normally used as a skeletal frame to withstand the loads on the building. However, a long-span beam requires a larger beam section due to the concerns of excessive deflection and failure. Under such circumstances, a large portion of beam strength is used to sustain its own weight which is uneconomical. This problem could be overcome by reducing some portions of concrete using lightweight materials like polystyrene. The replacement should technically be applied without affecting the structural performance of the beam. This study aimed to develop an optimum design of lightweight beam by incorporating polystyrene in the conventional reinforced concrete beam. The specimens were tested with a static load using the four-point load test in order to investigate the behaviour of the beam. The effects of the parameters, such as the spacing of the polystyrene, and the amount of reinforcements were observed. The performance of the beams was evaluated in terms of the ultimate load, strength to weight ratio (s-w ratio), ductility, and failure mechanism. The results show that the lightweight beam, with 11.8% concrete replacement, outperformed the conventional beam by 47% to 61%, in terms of the s-w ratio.

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Flexural Strength of Structural Beams Cast Using Combined Normal-Weight and Lightweight Concrete Mixtures

Jahami,

Dayaa,

Assaad

et al. 2024

Buildings

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Limited investigations have evaluated the potential of using layered sections of normal-weight and lightweight concrete (NWC and LWC) mixtures in structural beams and slabs. The main objective of this paper is to assess the flexural strength properties of layered reinforced concrete (RC) beams, which help conserve natural resources and reduce construction weight. Six RC beams cast with different NWC/LWC combinations are tested to determine the damage patterns, concrete strains, ultimate load, displacements at failure, and ductility. The test results showed that the LWC cast in the tension zone (and up to the neutral axis) has a negligible effect on the beam’s stiffness and ultimate load since the overall behavior remains governed by the yielding of tensile steel reinforcement. Nevertheless, the deflection at failure and ductility seem to gradually curtail when the NWC is partially replaced by LWC at different elevations across the beam’s cross-section. A finite element analysis using ABAQUS software 6.14 is performed, and the results are compared with experimental data for model validation. Such data can be of interest to structural engineers and consultants aiming for optimized design of slabs and beams using layered concrete casting, which helps reduce the overall construction weight while maintaining the structural integrity of members.

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Performance of Reinforced Concrete Beam with Polystyrene Blocks at Various Regions

Cited by 4 publications

References 1 publication

Behaviour of Reinforced Concrete Slabs with Embedded Polystyrene Spheres

Behaviour of Reinforced Concrete Slabs with Embedded Polystyrene Spheres

Improvement in the Reinforced Concrete Beam with Embedded Polystyrene under Static Load

Flexural Strength of Structural Beams Cast Using Combined Normal-Weight and Lightweight Concrete Mixtures

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