Kankeri, Pradeep and Chellapandian, M and S, Suriya Prakash
(2017)
Bonded overlay strengthening of hollow core slab with and without interface shearkeys connection.
In: 3rd International Symposium on Connection between Steel and Concrete (ConSC), September 27th-29th, 2017, Stuttgart, Germany.
Abstract
Precast Prestressed Hollow Core Slabs (PPHCS) are most commonly used as flooring and roofing elements. Usually, a new layer of concrete is placed on the top of hollow core slabs to create a continuous and levelled surface. The common thickness of this bonded overlay will be around 50 mm to 75 mm deep. The provision of Bonded Overlay (BO) will increase the cracking load and flexural strength of hollow core slab after the full composite action is developed. In the present study, the effect of shear keys at the interface of bonded overlay and hollow core slab is studied. The hollow core slab and bonded overlay is expected to have a full composite action until failure without any interface separation. The dimension of hollow core used in this investigation is 600mm wide, 150mm depth and 3500mm length. In total, three full-scale hollow core slabs were tested under shear span (a) to depth (d) ratio of 7.5. The three specimens which include un-strengthened slab denoted as control slab, slab strengthened with bonded overlay without any shear keys at the interface and bonded overlay with shear keys. Bonded overlay specimens without shear keys resulted in interfacial failure and it was able to increase the peak load by 38.4% compared to the control specimen. However, the bonded overlay with shear keys resulted in full composite action till the final failure and it was able to increase the peak load by 59.6% compared to the control specimen. The provision of shear keys at the interface of hollow core slabs and bonded overlay resulted in full composite action.
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