milad pourali

Today, concrete is widely used due to the use of materials with a lower price and good durability, and based on the development of common concrete technology, the construction of high-strength concrete has become popular in the design of executive structures in advanced countries of the world. According to some regulations, the minimum resistance for high-strength concrete is considered to be 55 MPa, and a resistance of this level is more attainable in laboratory conditions. Among its advantages, we can mention the increase in strength and hardness, which can reduce horizontal displacements, as well as the length of restraint and patch of rebars. Also, in order to reduce environmental pollution and increase the durability and reliability of the structure, the use of Micro Silica (MS) and Rice Husk Ash (RHA) instead of a part of all cement consumption is considered. This thesis deals with the properties of concrete containing MS and RHA. In total, two mixing plans were made with two water-to-cement ratios of 0.37 and ratios at the age of 7 and 28 days. The durability performance of high-strength concrete containing RHA and MS was measured using compressive strength, tensile strength, and elastic modulus tests. The results of the tests show that the compressive strength of concrete containing MS is higher than that of concrete containing RHA, and the tensile strength of concrete containing RHA is higher than the compressive strength of concrete containing microsilica.