Machine-made sand, preparation method and concrete prepared from machine-made sand

The invention provides machine-made sand, a preparation method and concrete prepared from the machine-made sand, and relates to the technical field of building materials. According to the preparation method, a sodium hexametaphosphate aqueous solution is used as a cleaning solution to clean crude sand (original machine-made sand which is obtained by mechanically crushing and screening rocks and meets the use requirements), so that the agglomeration of mud powder is reduced, the adhesive force between the mud powder and stone powder can be reduced, mud powder particles are separated, and the utilization rate of the mud powder is improved. And the effect of separating the mud powder from the stone powder can be achieved. As the density of the mud powder is small and the density of the stone powder is large, the mud powder in the cleaning liquid can float on the upper layer, and the stone powder is precipitated to the lower layer, the mud powder in the crude sand is removed in this way, and the stone powder is r