Deformation Analysis of Corrugated Steel Sheet-ultra Fine Iron Tailings Sand Concrete Composite Slabs

Specimens of composite floor slabs with corrugated steel plates and ultra-fine iron tailings sand concrete were designed and fabricated by replacing ordinary concrete with ultra-fine iron tailings sand concrete. Flexural performance tests were conducted to investigate the influences of key parameters, including the type of shear connectors, overlay thickness, corrugated steel plate ratio, iron tailings sand content, and concrete type, on the failure modes and strain behaviors of the specimens. The results indicate that the differences in shear connector types and arrangement configurations cause the corrugated composite slabs to be primarily categorized into two failure modes: slip failure and flexural failure. All specimens undergo four typical stages: elastic phase, crack development phase, yielding phase, and failure phase. The concrete strain at the mid-span section basically conforms to the plane section assumption along the slab height direction, exhibiting a linear distribution. During the elastic stage, the influence of various factors on the longitudinal strain of the tensile reinforcement, shear strain of the corrugated steel plate, and compressive strain of the concrete is relatively weak. Upon entering the crack development, yielding, and failure stages, as the overlay thickness, corrugated steel ratio, and iron tailings content increase, the slope of the load-strain curve is enhanced, and the strain development rate is correspondingly slowed. The slowest strain development is observed when the iron tailings content is 50%, whereas the type of shear connector shows no significant influence on strain development. Compared with ordinary concrete, composite slabs utilizing ultra-fine iron tailings concrete demonstrate a slower strain development rate. This study provides a feasible method for the application of ultra-fine iron tailings in composite slabs and also offers a scientific basis for alleviating the shortage of sand and gravel resources in China and promoting the large-scale resource utilization of iron tailings.