In the late few years, Egypt has been suffering from a dark clouds resulting from burning rice husk. Studies have been undergoing to study the possibility of using rice husk instead of burning it and soiling environment. The construction industry plays an important role in many countries. Waste materials are new challenge choice for use as construction materials, because construction materials coming from a natural source are irreversible. Rice Husk Ash (RHA) is one of waste materials from agricultural industry. It has some special characteristics that can enhance the properties of concrete, when it is used as a part of the ingredients in concrete mixes. The objective of this paper is to study the mechanical properties of concrete containing ordinary Portland cement, rice husk ash and super plasticizer compared to the silica fume concrete. The water cement ratio was equal to 35% by weight for all tested specimens whereas the slump was constant at 100 +/- 20 mm.