Evaluation of mechanical properties and durability of geopolymer concrete pavement fly ash and siflica fume

In recent years, using too much cement has led to the production of greenhouse gases, one of the consequences was the heating of the earth. These destructive effects lead to more attention to the use of pozzolanic materials. In this study, the durability of geopolymer concrete (active alkali slag) containing silica fume and fly ash against corrosive acidic, sulfate and compressive strength, flexural strength, tensile strength, and chloride ion permeability were investigated. The corrosive properties of different environments by the compressive strength and weight loss tests were compared. After 7 days of operation in lime water, samples were placed in sulfuric acid solution, magnesium sulfate, and sodium sulfate for 180 days. At first, the weight loss of the samples, then the compressive strength of the samples after exposure to the medium corrosive was measured. The compressive strength, flexural strength, tensile strength, and chloride ion permeability were also measured. In this study, increasing the of silica fume and fly ash alternatives instead of slag in concrete, compressive strength, flexural strength, tensile strength, and durability and chloride ion permeability increased; In fact, the best sample is pure slag geopolymer concrete, which has a compressive strength of 53.45 MPa, flexural strength of 6.05 MPa, tensile strength of 5.5 MPa, chloride ion flow rate of 6067 Coulombs and compressive strength after placement in sulfuric acid, magnesium sulfate, and sodium sulfate are 43.92, 44.8 and 45.9 MPa, and also the weight loss after placing in these solutions is 21, 14 and 12 grams respectively.