Optimization of Natural Desert Sand Concrete Mix Ratio
In order to make full use of natural resources in Xinjiang and achieve the purpose of"local materials"and"disaster prevention",this paper uses natural desert sand to replace concrete aggregate and adds fly ash and silica fume to cementitious materials to optimize the mix ratio of concrete.Firstly,the effects of four factors,such as fly ash content,water-binder ratio,cement-sand ratio and water reducer content,on the performance of desert sand concrete were studied by orthogonal test.The range,factor index and variance analysis were carried out in combination with the compressive and splitting tensile strength of natural desert sand concrete.Subsequently,the effect of silica fume content on the mechanical properties and working performance of natural desert sand concrete was investigated by single factor test.The results show that the optimal mix ratio of natural desert sand concrete is fly ash content of 20％(mass fraction,same below),water-cement ratio of 0.33,cement-sand ratio of 1∶2,and water reducer content of 0.8％.The addition of silica fume can significantly improve the compressive strength of desert sand concrete,but it will reduce the working performance of desert sand concrete.When 10％silica fume is added,the mechanical properties and working performance of desert sand concrete are the best.
万方数据
维普
