Concrete is one of the oldest construction material ever used. The quality of concrete will further affect the durability of the structure. Improvement of the characteristics of cement mortars and concrete is of interest to various researchers and practitioners in the field of construction materials engineering. This dissertation investigates the use of a modified zeolite additive to improve concrete quality.The emphasis of this study was on improvement of the strength and durability properties of cement mortar and concrete using PowerCem (PWC) additive.