Abstract: In literature there are many studies dealing with silica fume effect on concrete strength and properties but most of the experimental data available up to day, indicate that there are no radical results or mathematical models which can describe a constant effect. The scatter values of both experimental and numerical methods due to the continuous variety of the physical and chemical characteristics of the concrete components which needs to be investigated for each mix design in fact tests on mix design with variable components and parameters always referred to certain mix design at certain time and place. The present theoretical and experimental study will contribute to the available studies done in the past with new results and comments in particular the mix design physical and chemical properties and the variation of concrete properties when using silica fume and how it influences the concrete mix design, exploring the merits and practical considerations of using such material with recommendations and practical estimation on its utilization. Also, this investigation has been aimed to bring awareness amongst the practicing civil engineers regarding advantages of these new concrete mixes, the performance characteristics of the ready mix concrete become an essential requirement of concrete mix proportions which may include but are not limited to: setting characteristics, material compatibility evaluation, workability, place ability, strength, uniformity, durability and permeability. In general, the high-performance concrete is characterized by a compressive strength in the range of 60-100 N/mm2 this high value due to: the reduced water/cement ratio (0.40-0.20), compensated with the use of super-water-reducing admixtures. Use of mineral additions, alone or in combination with high pozzolanic activity and/or high specific surface area such as silica fume, slag micro fine, etc. Aggregates of high quality grind (basalt, granite, etc.) capable of ensuring a high intrinsic mechanical strength of the rock and good adhesion at the interface between the stone and cement matrix element.