The invention discloses high-flow-state high-stone low-sand pumping
machine-made sand concrete and a special admixture thereof. The concrete is prepared from the following components in parts by weight: 260 to 280 parts of
cement, 60 to 70 parts of mineral
powder, 50 to 60 parts of
fly ash, 650 to 750 parts of yellow sand, 1000 to 1100 parts of broken stone, 6 to 8 parts of the special admixture and 160 to 170 parts of water, wherein the special admixture is a polycarboxylic admixture and comprises the following components in percentage by weight: 3%-5% of a polycarboxylic
water reducer, 12%-15% of a polycarboxylic
slump retaining agent, 8%-10% of a polycarboxylic
viscosity reducer, 1%-3% of a
viscosity modifier, 2%-4% of a
retarder and the balance of water. By adopting a high-stone and low-sand pumping
machine-made sand concrete technology, the sand rate is reduced, the high strength of the structure is ensured, the
cracking risk is greatly reduced, the problems of insufficient concrete
slurry, stone
exposure and the like caused by the use of high-stone and low-sand are solved by adopting the special admixture, and the workability of the concrete is improved; in addition, the concrete provided by the invention can reduce the use amount of
cement and sand, reduce carbon emission and
resource consumption and reduce cost, and has the advantages of greenness and low carbon.