 The use of waste marble powder as a partial replacement for cement in concrete has been investigated. It was found that increasing the amount of waste marble powder in the mix from 0% to 40% resulted in a change from a shear crack to a flexural crack as the amount of waste marble powder increased. When the amount of waste marble powder exceeded 10%, the capacity of the beam decreased significantly, especially when the longitudinal reinforcing ratio was high. It was concluded that 10% to 20% waste marble powder could be used as a partial replacement for cement when the longitudinal reinforcing ratio is close to the balanced ratio, while more than 20% waste marble powder should be avoided. This article was authored by Memda Keralar, Yesin Anyaralpa's Kilik, Sihun Xsoilu, and others.