Determination of Sulphate Resistance of Concretes with Different Mixing

Abstract

The durability of concrete depends on its quality, and on the performance, component materials, mixing ratios, production method, processes such as the maintenance and curing of the concrete and environmental conditions are also effective. The aim of this study is to determine the change in the sulfate resistance of concrete with the controlled decrease and increase in mixing water of concrete samples prepared in different strength classes. For this purpose, mixing water ratios in concrete mixture designs prepared in strength classes C20/25, C30/37 and C40/50 were increased by 10%, 20%, 40%, 70% and 100% in a controlled manner and decreased by 10% and 20%. In order to determine the sulfate resistance of the concrete samples, the concrete samples were exposed to the wetting-drying cycle. After being kept at 105oC for 2 days, it was kept in a solution with 5% Na2SO4 content for 2 days and the cycle was completed. In this way, a wetting-drying cycle was performed. After the wetting-drying cycle was completed, the mass losses in the concrete samples were determined. As a result, reducing or increasing the amount of mixing water determined in the strength class and mixture calculation significantly affects the sulfate resistance of the concrete.