Static Load Test and Finite Element Analysis of Phosphogypsum Concrete Composite Slabs

This study investigates the influence of phosphogypsum (PG) content on the mechanical properties of concrete composite slabs reinforced with steel trusses. Static load tests were conducted on five one-way composite slabs with varying PG contents (0%, 2%, and 4%), and finite element analysis (FEA) was employed to simulate and analyze the structural behavior. The effects of PG content on crack distribution, ultimate failure mode, cracking load, and stiffness prior to ultimate load were systematically evaluated. The results demonstrated that the FEA simulations closely matched the experimental data, accurately capturing the failure mechanisms of the PG-based composite slabs. The optimal PG content was determined to be 2%, as the composite slab with 2% PG exhibited comparable strength to the conventional concrete slab (0% PG) while maintaining superior structural integrity during failure. These findings highlight the potential of PG as a sustainable additive in concrete composite slabs, offering a viable solution for reducing environmental waste and enhancing structural performance. This study provides valuable insights into the development of eco-friendly building materials and contributes to the advancement of sustainable construction practices.