عنوان مقاله [English]
The self-compacting concrete (SCC) is used even in the complex shapes and can pass through the densest reinforcement without requiring the means of vibration that is to say, it is recommended concrete to use in the major projects. It uses superplasticizer and stabilizers to significantly increase the ease and rate of flow. Degradation and serious damage of concrete structures triggered by sulfate attack has been widely reported in the saline soil or salty-lake areas all over the world. Sulfates has been claimed to be one of the common corrosive sources in the environments, such as soil, groundwater, lakes or rivers. Many studies revealed that sulfates in the pore solutions could react with cement composition or hydration products to form new phases. Concrete aggregates can include healthy and unhealthy gravel and sand grains. In this study, the effect of unwell aggregates disposed to expansion reaction in a simulated destructive environment investigate on the strength and durability of samples at different ages for compression, tensile and bending samples of self-compacting concrete. Unhealthy materials extract from the exploited gravel and sand mines, which have an impurity of more than the allowable value of 0.4% According to issue 9 of the Iran National Building Code. Sodium hydroxide with three different percentages (2%, 2/5%, 3%) of water weight uses to prevent the destructive effects of the sulfate environment. According to a review of past studies and review similar topics, self-compacting concrete was used instead of concrete. Also, in this study, the aggregate sulfate used in self-compacting concrete. Due to that, the mechanical properties and durability of self-compacting concrete in sulfate environments investigated. The results of the study show that adding sodium hydroxid into the sulfate aggregate in the 7 days self compacted concrete sample, increases the tensile strength up to 84.15 percent and reduces the permeability and water absorption up to 21.87 and 16.67 respectively.