Experiments on flexural behavior of the prefabricated RAC and NWC composite slab

Abstract

The development of prefabricated buildings is a long-term industrial policy in China. In the prefabricated frame structure, the slab is one of the critical components. However, two kinds of famous prefabricated slabs in China need the template system and sometimes need a particular fabrication site. The paper proposed a novel prefabricated concrete composite slab, which adopts the high-strength bolt as the shear connector. Compared with the traditional precast concrete composite slab, the novel prefabricated concrete composite slab does not need a template and temporary support. Compared with the conventional composite slab, it has analogous rigidity. Still, it does not require a fireproof coating. It has fast construction speed and a low comprehensive cost. The paper conducted 13 slab specimen bending tests on the novel composite used recycled aggregate concrete (RAC) and normal weight concrete (NWC) to reveal the slab's flexural behavior. The test data and analysis show that the three-inch-high profiled steel sheeting as a shear connection can have an excellent composite effect. The neutral axis of the whole section always locates within profiled steel sheeting. And the profiled steel sheeting has been participating in the load-bearing work of the composite slab. The composite slabs showed good bending bearing capacity and ductility. The RAC with a replacement ratio of 50% recycled aggregate has the same material performance and member performance. The composite slab proposed can meet most civil buildings' design requirements. The standard push test revealed that the bolt shear connectors' ultimate bearing capacity meets the Chinese design code with the floor's considerable slippage.

Keywords

• Prefabricated slab
• Composite slab
• Recycled concrete
• Profiled steel sheeting
• Bending bearing capacity