Experimental Study of the Bending Behavior of Concrete Slabs Incorporating Coal Gasification Ash Slag

This study examines the flexural behavior of concrete slabs incorporating 20% coal gasification slag (CGS) as a partial cement replacement. Experimental tests were conducted on C30, C40, and C50 grade slabs, and the results were validated through finite element analysis in ABAQUS. The findings show that CGS significantly improves the load-bearing capacity and ductility of C40 slabs, while its effects on C30 and C50 slabs are less pronounced. The improvement is attributed to the pozzolanic reaction of CGS, which refines the microstructure and enhances crack resistance. Numerical simulations reproduced the load–deflection response and failure modes with good accuracy, confirming the reliability of the proposed model. These results highlight the potential of CGS as a sustainable material for structural applications, contributing to both performance enhancement and environmental benefits.