Flexural Behaviour of Precast Concrete Slabs Reinforced with Hollow Composite Systems

Xeros, Alastair G. (2017) Flexural Behaviour of Precast Concrete Slabs Reinforced with Hollow Composite Systems. [USQ Project]

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Precast concrete solid slabs have been used extensively in the building industry. Solid reinforced concrete (RC) slabs are heavy in weight and use significant amount of materials to manufacture. Hollow-core RC slabs are now being manufactured to minimise the weight and the usage of materials. However, the hollow-core creates some issues as they are prone to collapse and shear failure. There is therefore a need to stabilise the hollow-core for a more effective precast concrete slab system. A hollow composite reinforcing system has recently been developed to create hollow-core in RC slabs. This composite system has four flanges to bond more effective in concrete. It is the aim of this project to determine the effectiveness of this hollow composite reinforcing system in enhancing the flexural behaviour of concrete slabs.

The flexural behaviour of three slabs with different section configuration was investigated under 4- point static bending. The first slab has a solid cross section, the second with a hollow-core created by providing 3 pieces of PVC of 60 mm internal diameter, and the third one reinforced with 3 pieces of hollow composite reinforcement systems. All slabs have an overall thickness of 175 mm thick and reinforced with 12 mm diameter steel bars at the top and bottom spaced at 150 mm on centres. The results demonstrated that the solid and hollow slab behaved similarly due to the compressive stress in the concrete is above the voids. On the other hand, the slab reinforced with hollow composite systems has twice the capacity to that of solid RC slabs. This indicates that the thickness of this slab can be further reduced to carry the same load carried by solid RC slabs but at significantly lower weight and lesser material usage. Theoretical evaluation following the AS3600 and the simplified Fibre Model Analysis can accurately predict the capacity of the slabs. Overall, this study demonstrated that the SR60 FRP reinforcement is a beneficial technology and is suitable for hollow precast concrete slabs. It could make concrete slabs much lighter and more cost effective than solid and traditional hollow slabs.

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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Engineering (Civil)
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Supervisors: Manalo, Allan
Date Deposited: 06 Sep 2022 23:08
Last Modified: 06 Sep 2022 23:08
Uncontrolled Keywords: precast concrete slabs; Solid reinforced concrete (RC); building industry
URI: https://sear.unisq.edu.au/id/eprint/40835

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