Experimental Study On Flexural Mechanical Properties Of Bamboo-Phosphogypsum Composite Floor Slabs

This paper proposed a new kind of lightweight and green bamboo-phosphogypsum composite floor slab which is mainly composed of renewable bamboo and phosphogypsum derived from industrial waste,and has the characteristics of low energy-consumption,low cost and high-efficiency.It is significant to popularize the bamboo-phosphogypsum composite floor slab for expanding the application of bamboo and phosphogypsum and promoting the sustainable development of construction industry.(1)In this paper,the basic mechanical properties of bamboo,phosphogypsum and oriented strand board were tested,and the basic mechanical parameters of these materials were obtained.The influence of bamboo node on the mechanical properties of bamboo and the influence of sampling direction on the mechanical properties of oriented strand board were analyzed.The results show that the node weaken the parallel-to-grain tensile strength of bamboo,strengthen the parallel-to-grain tensile elastic modulus and compressive elastic modulus to a certain extent,and have little effect on parallel-to-grain compressive strength,bending strength and bending elastic modulus.The mechanical properties of oriented strand board in length direction are different from those in width direction.(2)In this paper,the flexural mechanical properties of bamboo-phosphogypsum composite floor slab were tested.The failure mode,damage mechanism and combination effect of composite floor slab were analyzed.The influences of spacing of bamboo and spans of floor on the bending capacity of composite floor slab were discussed.The bending capacity between bamboo frame floor and composite floor slab were compared.The results show that bamboo and phosphogypsum have good combination effect.The bearing capacity of composite floor slab decreases with the increase of spacing of bamboo and spans of floor.The ultimate bearing capacity of composite floor slab is 31.26% higher than that of bamboo frame slab.(3)The finite element analysis model of bamboo-phosphogypsum composite floor slab was established by the finite element software ABAQUS.The effects of slab thickness,shear span ratio,eccentric distance of bamboo and lower phosphogypsum on the flexural performance of composite floor slab were analyzed by using the verified finite element model.The results show that the bearing capacity of composite floor slab increases with the increase of slab thickness.Increasing shear span ratio and eccentric distance of bamboo will reduce the bearing capacity of composite floor slab.Removing phosphogypsum and oriented strand board from the bottom of composite floor slab can reduce the weight of the floor,and the bearing capacity of composite floor slab can be reduced less.