High-strength self-stress coal mine bottom plate grouting reinforcement material and preparation method thereof

The invention discloses a high-strength self-stress coal mine bottom plate grouting reinforcement material, which comprises the following raw materials in parts by weight: 20-30 parts of slag, 10-15 parts of sulphoaluminate cement, 30-40 parts of fly ash, 5-10 parts of industrial waste alkali, 2-7 parts of a self-stress component, 3-7 parts of an exciting agent and 0.5-4 parts of a water reducingagent. The preparation method comprises the following steps: uniformly mixing sulphoaluminate cement, slag, fly ash and a self-stress component in parts by weight to obtain a component A; mixing and dissolving industrial waste alkali, a water reducing agent and an exciting agent in water to obtain a component B; and mixing the two components to obtain the grouting reinforcement material. Accordingto the invention, slag and fly ash are used as main raw materials, so that the cost can be reduced, and the mechanical property of the grouting material can be improved; And sulphoaluminate cement and a self-stress component