Nanotechnology is one of the most modern fields of science that has had a significant impact on the market and the economy. The need for research in the field of continuous nanotechnology is growing. In recent decades, nanotechnology has developed rapidly in many fields of applied sciences, engineering, and industrial applications, especially through the study of physics, chemistry, medicine, and basic materials science. Thisspeed of development indicates the fact that in the process of nanotechnology, the functional properties of materials can be significantly improved. In recent years, with the advent of nanotechnology, new perspectives have been developed in the field of concrete technology. In general, as the particle size decreases, the ratio of the effective surface area to the particle volume increases. This means that the reactivity of nanoscale materials increases compared to larger materials. Therefore, the use of nanoparticles is expected to have significant effects on the properties of concrete.In this study, in order to investigate the effect of silica colloidal nanoparticles on concrete and its effect on behavior after failure, standard cylindrical specimens were made according to the existing regulations and stress-strain behavior of samples 7, 28 and The 90 days were compared and the concrete was made with 5%, 10% and 15% colloidal nano silica and with two different mixing designs. The stress-strain behavior of concrete based on the results of compressive strength test showed that by adding nanoparticles to 5%, 28-day compressive strength of concrete increased by 9%. This value is 0.00351 in control samples.The results of porosity analysis also show that by increasing the percentage of colloidal silica nanoparticles, the porosity ratehas been reduced by up to 35%