Cost Effective Design Technique for Hollow-Core Concrete Slab for Typical Forms & Shapes of Cut Outs

International Journal of Civil Engineering
© 2022 by SSRG - IJCE Journal
Volume 9 Issue 9
Year of Publication : 2022
Authors : Vikas Gandhe
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How to Cite?

Vikas Gandhe, "Cost Effective Design Technique for Hollow-Core Concrete Slab for Typical Forms & Shapes of Cut Outs," SSRG International Journal of Civil Engineering, vol. 9,  no. 9, pp. 22-26, 2022. Crossref, https://doi.org/10.14445/23488352/IJCE-V9I9P104

Abstract:

In the modern era, construction industries play a vital role in the construction of civil structures. In India, house construction is generally carried out with concrete as a major constituent. The use of concrete is mostly used for slabs, beams, columns, and footings. It was observed that the total consumption of concrete and cement takes about 40% of the total concrete work for the slab. Searching for an economy in concrete components for the slab was felt necessary. Various alternatives were thought to save the concrete in a slab. It is well-known that the concrete bears maximum compression and is very weak to resist tension. Due to dead load, live load, and floor finish load, the slab deflects and takes a concave shape. With this concept, the concrete was pulled up from the tension zone, and recycled waste plastic with different forms and shapes in core holes was placed in the concrete. Five forms were selected for the core holes. These forms included the square, circular, elliptical, hemi spherical dome, and the frustum of a cone form. The depth of the core hole was based on the depth of the actual neutral axis. The program in excel was prepared for the analysis and design of the concrete slab with core holes of various spacings in the x direction and the y direction. For the analysis and design of the concrete slab, a 3.5 m X 3.5 m panel was considered. Three different thicknesses, 250 mm, 200 mm, and 150 mm, were considered to check the stability of the concrete slab. Mix-20 and Fe-415 were used to design the slab per the I.S. code 456 - 2000. The spacing, size, and depth of core holes for five forms were selected to determine the maximum saving of concrete in terms of percentage. All the cases for 250 mm, 2000 mm, and 150 mm slab thickness were considered using 12 mm, 16 mm, or 20 mm bar diameter as per the requirement of stability of all checks as per IS-Code. The results thus obtained were shown in a tabular form for the maximum percentage of saving of concrete for the selected two-way slab.

Keywords:

Deflection, Flexure Moment, Hollow Core, Reinforcement, Shear Strength.

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