The research has shown that use of tire rubber as coarse aggregate in Reutilization of waste tire material can help reduce the environmental pollution, generated each year in Oman‘s landfills, where tire waste is often improperly or illegally disposed of. The number of vehicles over the decade has increased considerably, and the need to identify feasible solutions to minimize tire waste is needed. The aim of this project is to identify the optimal use of waste tire rubber as coarse aggregate by partial replacement of 10%, 15%, and 20% with micro silica in the concrete. The objective of this research study is to determine and evaluate the fresh and hardened properties of the concrete. The micro silica replaced the cement by 10%, 20% in the first experiment to determine if micro silica improved the strength in the concrete. Additionally, in the second experiment, the tire rubber was treated in NaOH solution to determine the bonding improvement between the rubber and cement, while using the same replacement ratio. The mix design was developed for C35 strength for both experiments. Using 150X150X150mm cube moulds a total of 28 cubes were casted and cured for 28 days under normal conditions. The mix proportion used is 1: 1.73: 2.2 with water cement ratio of 0.47. The objective of this research is to determine the fresh and hardened properties of concrete under the influence of rubber and mineral admixtures. The results of the experiments showed a reduction in compressive strength as tire rubber content increased when compared to control mix. However, the tire rubber treated in NaOH solution yielded slightly better compressive strength results overall.