Sawdust-Based Concrete Composite-Filled Steel Tube Beams: An Experimental and Analytical Investigation

Incorporating waste byproducts into concrete is an innovative and promising way to minimize the environmental impact of material while maintaining and/or improving concrete’s mechanical characteristics strength. The proper application sawdust as a pozzolan in building industry remains significant challenge. Consequently, this study conducted experimental evaluation fill material. In particular, fine aggregate offers realistic structural economical possibility for construction lightweight systems. Failure under four-point loads was investigated six concrete-filled steel tube (CFST) specimens. results indicated that recycled performed similarly conventional when used filler composite beams. effects substitution on ultimate load initial stiffness were less substantial than relative changes properties, capacity tested samples decreased moderately percentage increased. Moreover, maximum observed decrease by 6.43–30.71% replacement levels between 5% 45.1% across all samples. Additionally, using with sawdust, moment value CFST sample reduced 6.4%. Notably, exhibited flexural behavior relatively comparable standard