Experimental Study on Mechanical Properties of Manufactured Sand,Silica Fume and Steel Fiber Modified Concrete
Manufactured sand,silica fume and steel fiber modified concrete were prepared by replacing 100%natural river sand with manufactured sand.A total of 13 groups of concrete specimens were designed and manufactured,the amount of silica fume added was 0%,7.5%,15%of the cementitious material total mass,and the amount of steel fiber added was 0%,0.5%,1%,1.5%of the mixture total volume.The working performance and mechanical properties of modified concrete were studied by testing compressive strength,splitting tensile strength,bending strength and impact strength.The research results show that compared with the concrete prepared by natural river sand,the mechanical properties of concrete prepared by manufactured sand can be improved to a certain extent.Compared with concrete without silica fume and steel fiber,the addition of silica fume can significantly improve the tensile strength of concrete,and the addition of steel fiber can significantly improve the tensile strength and impact strength of concrete.
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