Steel slag-coal gangue geopolymer and preparation method thereof

The invention discloses a steel slag and coal gangue geopolymer which comprises the following components in parts by weight: 70-100 parts of steel slag powder, 5-20 parts of coal gangue powder, 1-10 parts of alkaline excitant and 10-50 parts of water. The steel slag magnetic separation tailings and coal gangue are used as main raw materials, under the excitation condition, generation of an N-A-S-Hgel phase or a C-S-H gel phase or an S-A-H gel phase is promoted, a gel network structure is formed in a formed geopolymer, and meanwhile, by regulating and controlling the ratio of steel slag powderto coal gangue powder and the alkaline excitation condition, the CaO component in the steel slag powder can be fully utilized, the mechanical property and the volume stability of the obtained oligomer material are further improved, and the mechanical property and the durability of the obtained oligomer material are effectively improved; in addition, high-dosage application of the steel slag powder in the oligomer material