Experimental Study on Flexural Performance of Precast Concrete Slab with Fiber Reinforced Concrete Topping

The positive effects of various types of fibers on concrete ductility and other engineering properties, such as the tensile, flexural, fatigue, toughness and load-bearing capacity after cracking and toughness, are well known. Steel fibers as well as glass fibers have been used increasingly along with concrete in recent years and they show positive results. Considerable interest has been developed in using these fibers in concrete to increase the load-carrying capacity of the structural members in service. Recently, it has been used to improve the capacity of concrete slabs by applying a layer of concrete layer onto an existing slab. It is to be investigated about the flexural behaviour of a precast concrete slab with a steel fiber of different proportion as well as glass fiber concrete topping. The performance of this composite slab depends on the bonding between the old and new concrete. The interface has been chipped using chipping tools to provide good bonding between the two layers. Researches were made on slabs with steel fiber reinforced topping and improved the performance of the specimen when SFRC topping was made compared with slab with normal steel reinforced concrete topping. So here the slabs without topping, slab with normal steel reinforced topping, slab with SFRC topping and slab with glass fiber reinforced concrete topping were casted and tested. Based on tests, the flexural performance depends on the type of reinforcement provided to the topping. When FRC topping was used, the flexural capacity was found to increase and as a result, the central deflection of specimens with FRC topping were considerably decreased. Among these, slab with SFRC topping had better performance compared to others.