Experimental Study On The Mechanical Behavior And Frost Resistance Of Desert Sand High Strength Concrete From Mu Us Desert

Currently, many studies on the properties of desert sand high strength concrete were carried out by researchers abroad and at home. However, there are few documents on the frost resistance property of desert sand high strength concrete. Firstly, the compressive strength, splitting tensile strength and the static compressive elastic modulus test of desert sand high strength concrete with various desert sand replacement rate and fly ash dosage were carried out. The influences of desert sand replacement rate and fly ash dosage on the compressive strength, splitting tensile strength and the static compressive elastic modulus of desert sand high strength concrete were analyzed. Then,4 factors 3 levels orthogonal experiment was designed to carry out the freeze-thaw test of desert sand high strength concrete with saline solution and water environment, respectively. Dynamic elasticity modulus of desert sand high strength concrete with different times of freezing and thawing cycles was tested. The influences of water-binder ratio, fly ash dosage, sand ratio and desert sand replacement rate on the frost resistance property of desert sand high strength concrete were analyzed. By range analysis and variance analysis, the optimum mix ratio of desert sand high strength concrete was obtained.1) The compressive strength and splitting tensile strength test of desert sand high strength concrete with various desert sand replacement rate and fly ash dosage were carried out. The influences of desert sand replacement rate and fly ash dosage on the compressive strength and splitting tensile strength of desert sand high strength concrete were analyzed. The experimental results show that with the increase of desert sand replacement rate, the compressive strength and splitting tensile strength of desert sand high strength concrete increases firstly, and then decreases. When desert sand replacement rate is equal to 20%, the compressive strength and splitting tensile strength of desert sand high strength concrete reaches the maximum. With the enhancement of fly ash dosage, the compressive strength and splitting tensile strength of desert sand with high strength concrete increases firstly, and then decreases. When fly ash dosage is equal to 15%, the compressive strength and splitting tensile strength of desert sand high strength concrete reaches the maximum value.2) The static modulus of elasticity test of desert sand high strength concrete with various desert sand replacement rate and fly ash dosage were carried out. The influence of desert sand replacement rate and fly ash dosage on the static modulus of elasticity of desert sand high strength concrete was analyzed. The experimental results show that with the increase of desert sand replacement rate, the static modulus of elasticity of desert sand high strength concrete increases firstly, and then decreases. When desert sand replacement rate is equal to 20%, the static modulus of elasticity of desert sand high strength concrete reaches the maximum. With the enhancement of fly ash dosage, the static modulus of elasticity of desert sand with high strength concrete decreases.3) 4 factors 3 levels orthogonal experiment was designed to carry out the freeze-thaw test of desert sand high strength concrete with saline solution and water environment, respectively. Dynamic elasticity modulus of desert sand high strength concrete was tested with different times of freezing and thawing cycles. The influences of water-binder ratio, fly ash dosage, sand ratio and desert sand replacement rate on the frost resistance property of desert sand high strength concrete were analyzed. By range analysis and variance analysis, the optimum mix ratio of desert sand high strength concrete is that water-binder ratio, fly ash dosage, sand ratio and desert sand replacement ratio are 0.24,10%,35% and 30%. respectively, which provides guidance for the engineering application of desert sand.