Ultra-high performance concrete with waste brick powder and preparation method and application thereof

A preparation method of an ultra-high performance concrete with waste brick powder, wherein raw materials of the ultra-high performance concrete with waste brick powder comprise, in parts by mass, 35-42 parts of cement, 28-35 parts of brick powder, 10 parts of fly ash, 20 parts of silica fume, 100 parts of grit, 15.6 parts of steel fiber, 30 parts of water reducing agent and 17 parts of water;

• the brick powder and the cement are in a total amount of 70 parts;
• the preparation method of the ultra-high performance concrete with waste brick powder comprises following steps:
• stimulating activity of the brick powder by using a method of mechanically stimulating activity to obtain the waste brick powder;
• and
• preparing ultra-high performance concrete by weighing the raw materials in parts by mass to obtain the ultra-high performance concrete with the waste brick powder;
• and
• the method of mechanically stimulating activity specifically comprises stimulating the activity of the brick powder by using a ball mill to ball mill a brick powder with a particle size of 8-75 micrometers for 45 minutes at a rate greater than 45 revolutions per minute.