The invention provides C30 concrete. One cubic meter of C30 concrete is prepared from the following raw materials: 304 to 315kg of P.O42.5R
cement, 400 to 410kg of
river sand, 400 to 410kg of
machine-made sand, 200 to 210kg of recycled aggregate with the particle
diameter being 5 to 10mm, 785 to 805kg of recycled aggregate with the particle
diameter being 10 to 25mm, 82 to 88kg of
tap water, 82 to 88kg of concrete stirring
station recovery water, 51 to 57kg of S75 stage ore
powder, 6.9 to 7.7kg of additives and 1.9 to 2.3kg of retarders; the fall highness of the C30 concrete is 200+ / -20mm. The invention also provides a preparation method of the C30 concrete. In the C30 concrete provided by the invention, the content of the
tap water and
recovery water is respectively 50 percent; for the mixed
recovery water, the ingredients of additives are regulated, so that the fall highness of the C30 concrete is 200+ / -20mm; the quality effect identical to that of the concrete mixed by using pure
tap water can be achieved; in addition, 50-percent recovery water is mixed in the C30 concrete; the C30 concrete workability is greatly changed; the use of the tap water is reduced; in addition, the recycled aggregate is obtained through crushing,
processing and screening building garbage; the material cost is reduced; meanwhile, the
ecological environment is effectively protected.