Incorporating Lightweight Materials in Reinforced Concrete Beams and Slabs –A Review

doi:10.35370/bjost.2019.1.2-03

Cited by 3 publications

(6 citation statements)

References 2 publications

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“…Sharp corners or edges should be avoided. The round corners and smooth edges prevent stress concentration [19][20][21], resulting in better structural performance [22].…”

Section: Materials Reference Creating Voids In Slabsmentioning

confidence: 99%

“…[1] √ [5] √ [7] √ [9] √ [10] √ [11] √ [13] √ [16] √ [17] √ [18] √ [12] √ √ [21] √ √ √ [23,24] √ √ [8] √ √ [19] √ √ √ √ √ [15] √ [3] √ √ [25] √ [14] √ Among previous studies, the concrete replacement rarely exceeded 30% [17,22]. These slabs' performance is often inferior to that of a solid slab.…”

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

confidence: 99%

“…Despite this, removing concrete from the slab can improve material efficiency [21,22]. If properly designed, the strength-to-volume ratio of these slabs can exceed that of a solid slab [22,27]. The strength-to-volume ratio is sometimes known as the strength-to-weight ratio.…”

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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“…Sharp corners or edges should be avoided. The round corners and smooth edges prevent stress concentration [19][20][21], resulting in better structural performance [22].…”

Section: Materials Reference Creating Voids In Slabsmentioning

confidence: 99%

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

confidence: 99%

See 1 more Smart Citation

Behaviour of Reinforced Concrete Slabs with Embedded Polystyrene Spheres

Ling,

Lau,

Lim

2024

Civil Sustain. Urban Eng.

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“…Out of the limited data, it seemed the beam with polystyrene spheres was more efficient than the solid beam. There have also been studies that show a discernible loss of strength in hollow beam sections [1,30]. For some reason, the two types of beams were similar, but the outcome varied.…”

Section: Feasibility Evaluationmentioning

confidence: 99%

“…The material's efficiency can also be a concern for these beams. The beam can lose more strength than weight, in percentage [30]. Thus, this kind of beam needs to be comprehensively investigated, particularly to uncover the factors governing its structural performance.…”

Section: Introductionmentioning

confidence: 99%

Structural Behaviour of Reinforced Concrete Beam with Embedded Polystyrene Spheres

Ling¹,

Lau²,

Lim³

2023

Civil Sustain. Urban Eng.

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The beam is a structural element in a reinforced concrete structure. However, its weight places additional strain on the columns and foundations.Polystyrene spheres can be used to replace concrete in a beam to reduce its weight. However, this can affect the beam’s structural performance. This study investigated the behavior of beams with embedded polystyrene spheres under loads. The purpose was to determine the feasibility of this technique. Six beam specimens, including a control specimen, were tested under the four-point load setup. The polystyrene spheres’ diameter ranged from 50 mm to 75 mm. The spacing between the spheres varied from 10 mm to 30 mm. By replacing 8.7% of the concrete, the beam's strength increased by 8% per unit of concrete. The polystyrene spheres marginally altered the load capacity but reduced the stiffness, uncracked load, and ductility. The load capacity decreased by 2.6% as the polystyrene sphere’s diameter increased from 50 mm to 10 mm. The strength increased by 0.6% as the spacing increased from 10 mm to 30 mm. For satisfactory performance, the polystyrene spheres with a diameter of 0.57 times the beam’s width may be spaced at 1.2 times the concrete cover.

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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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Incorporating Lightweight Materials in Reinforced Concrete Beams and Slabs –A Review

Cited by 3 publications

References 2 publications

Behaviour of Reinforced Concrete Slabs with Embedded Polystyrene Spheres

Behaviour of Reinforced Concrete Slabs with Embedded Polystyrene Spheres

Structural Behaviour of Reinforced Concrete Beam with Embedded Polystyrene Spheres

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

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