Flexural Behaviour of Concrete Composite Slabs with Precast Ribbed Reactive Powder Concrete Bottom Panels

摘要

This paper introduces a new kind of large-span concrete composite slab with precast ribbed reactive powder concrete (RPC) bottom panels. The deflection, crack characteristics and normal section bearing capacity of four full-scale specimens were investigated experimentally. The results showed that the cracks in these slabs were fine and dense, the flexural stiffness and normal section bearing capacity were higher than ordinary concrete slabs. The ordinary concrete layer and precast ribbed RPC bottom panel bond well at the peak load. The calculation methods that consider the RPC tensile stress in the bottom panel are proposed to calculate the flexural stiffness, crack width and normal section bearing capacity of this kind of composite slab.