Method for preparing nanometer silicon dioxide high-performance concrete

The invention discloses a method for preparing nanometer silicon dioxide high-performance concrete and relates to a method for preparing concrete. The method comprises the following steps: weighing the components according to a mixture ratio by weight, wherein the mixture ratio of the components in the concrete is cement: water: sand: crushed stone: water reducing agent: nanometer silicon dioxide = 1: 0.31: 1.53: 2.60: 0.02: 0.015; dissolving nanometer silicon dioxide in the water and stirring for 20-40 seconds to obtain a nanometer solution, uniformly stirring the cement weighed in step 1 with a mixed solution of the water reducing agent, tributyl phosphate, sodium citrate and the nanometer silicon dioxide in step 2 until a uniform cement mortar is formed and no obvious cement regiment can be seen; adding sand into the cement mortar and stirring for 30-60 seconds to obtain a cement-sand mortar, and then adding crushed stone and the cement to obtain the nanometer silicon dioxide high-performance concrete. The method is convenient in process and construction, excellent in product dispersity and good in concrete fluidity, so as to provide a technological approach for scale production of the nanometer silicon dioxide high-performance concrete.