Flexural performance of precast WWCB-filled concrete floor slabs

Wood wool cement board is made of Portland cement as a cross-linking agent, wood fiber as a fiber reinforcement material, and some additives. The precast WWCB-filled concrete floor slabs are a new type of hollow slab. This structure formed by pouring the bottom layer of concrete, laying the WWCB, then pouring the top layer of concrete, and finally curing. And this type of floor slabs is composed of double-layer reinforcement mesh, including top and bottom reinforcement which connected by triangular contact bars. In order to study the mechanical properties of the precast WWCB-filled concrete slabs themselves, this paper conducted four-point bending loading tests on 9 precast WWCB-filled concrete slabs of different sizes to analyze the effect of penetration type and cavity size on the flexural performance of the slabs. The results of the experimental study show that: the ultimate load-bearing capacity of precast WWCB-filled concrete slabs is higher than 100-mm-thick solid slabs, and their deflection of them is similar to that of ordinary solid slabs, with good plasticity and flexibility; the overall flexural resistance of the precast WWCB-filled concrete slabs is good, the crack distribution is uniform, and the damage pattern is better than that of cast-in-situ slabs.