High-strength impermeable foam concrete and preparation method thereof

The invention relates to the field of building materials, and particularly discloses high-strength impermeable foam concrete as well as a preparation method and application thereof. The high-strength impervious foam concrete is prepared from the following raw materials: 100 to 300 parts of cement, 50 to 150 parts of fly ash, 5 to 15 parts of fiber mixture, 30 to 40 parts of river sand, 2 to 5 parts of water reducing agent, 3 to 10 parts of foaming agent, 3 to 5 parts of foam stabilizer, 100 to 200 parts of ceramsite, 50 to 150 parts of montmorillonite powder, 4 to 8 parts of water repellent and 100 to 1200 parts of water. The preparation method of the ceramsite comprises the following steps: mixing and ball-milling the fly ash, the bentonite and the red mud, adding the water, the foam stabilizer and the pore-foaming agent, uniformly stirring to prepare a spherical sample, drying, calcining, and cooling to prepare a green body; mixing coal gangue powder, a binder and water, adding the green body, uniformly mix