Preparation process for improving performance of machine-made sand concrete

The invention belongs to the field of concrete production, and particularly relates to a preparation process for improving the performance of machine-made sand concrete.The preparation process comprises the following specific steps that S1, an ether water-reducing type water reducer, an ether slump-retaining type water reducer, a retarder, a mud blocking agent and water are taken according to the proportion of 160: 35: 20: 5: 780 and compounded, and a composite additive is obtained; s2, 585 parts of machine-made sand are taken and cleaned through cleaning equipment, then the cleaned machine-made sand is dried, and then the treated machine-made sand, 200 parts of fine river sand, 25 parts of red mud and 1050 parts of stone are stirred and mixed for 30-50 s to obtain a mixture A; s3, adding 60 parts of fly ash, 60 parts of slime and 240 parts of cement into the mixture A, and stirring and mixing for 40-50 seconds to obtain a mixture B; according to the present invention, the composite admixture is obtained by c