C150 (strength grade) concrete for section steel-concrete combined structure

The invention discloses C150 (strength grade) concrete for a section steel-concrete combined structure, which is characterized by being prepared by mixing cement, fine aggregate, coarse aggregate, water, water reducer, defoaming agent, siliceous dust and flash ash in a mass/volume ratio of 485:701:1,145:104:15:1:65:100. The preparation method of the concrete comprises: adding the fine aggregate and half of the total amount of water into a forceful stirrer in turn according to a weight mixing ratio, uniformly stirring for 1 to 2 minutes, adding the coarse aggregate, uniformly stirring for 2 to 4 minutes, adding the cement, the siliceous dust and the flash ash, uniformly stirring for 2 to 3 minutes, adding the water reducer, the defoaming agent and the rest of water, uniformly stirring for 2 to 5 minutes, and discharging to obtain a concrete mixture. The concrete has obviously improved section steel binding performance in a natural state and can effectively play respective capability and coordinate operation performance with the section steel, thereby improving the bearing capacity and performance of a member considerably and improving the durability, high-volume stability and economy of the member.