Shear capacity of composite slab reinforced with steel fibre to that of fabric reinforcement in concrete topping

Abstract

This paper presents the experimental result on the shear capacity of composite slab reinforced with steel fibre concrete topping. Experimental test is carried out on 75 composite slab specimens reinforced with various steel fibres volume fractions in the concrete topping. The type of steel fibres is varied to determine the suitable type to be applied in the concrete topping. This includes HE0·75/60, HE0·75/50 and HE0·55/33 referred to as SF60, SF50 and SF33, respectively, in this paper. The test parameters are fibre aspect ratio, volume fraction and fibre reinforcing index. Control specimen using prefabricated welded steel mesh in the concrete topping is also tested for comparison. The test results show that by replacing prefabricated welded steel mesh with steel fibre in the concrete topping increased the shear capacity of the composite slab. However, the increment depends on the type of steel fibre, where the optimum increment for SF60 and SF50 started at V_f = 0·75% whereas for SF33 at V_f = 0·25%. Even though the percentage increment is small from the whole capacity of the composite slab, but the steel fibre is able to arrest cracks once the propagation started to reach the concrete topping zone during the post-cracking development. This is important especially to members subjected to high shear load, where steel fibres can create an additional shear carriage capacity by preventing them from sudden failure.

Keywords:

• Steel fibre reinforced concrete
• Composite slab
• Fibre aspect ratio
• Volume fraction and Reinforcing index

Acknowledgements

This research work is funded by the Exploratory Research Grant Scheme (ERGS) No. 4L066. Special appreciation goes to all staffs at the Structural & Material Laboratory, Faculty of Civil Engineering, Universiti Teknologi Malaysia for their passionate help. Also, appreciation for the study leaves sponsorship by the Universiti Malaysia Pahang and Ministry of Higher Education to the corresponding author. Special thanks also goes to Oriental Housetop Sdn. Bhd. for supply of the steel fibre.