Solid waste large-mixing-amount concrete prefabricated laminated slab and preparation method thereof

A method for preparation of a solid waste large-mixing-amount concrete prefabricated laminated slab, comprising:

• coating an interface agent in a mold, and then binding a reinforcement cage in the mold;
• pouring a solid waste large-mixing-amount concrete in the mold, vibrating the concrete, and then pressing transverse grooves and longitudinal grooves in a concrete pouring surface by using a notch mold to obtain a concrete member, wherein the solid waste large-mixing-amount concrete consists of the following raw materials:
• 350 to 400 kg/m3 of cement, 35 to 43 kg/m3 of fly ash, 30 to 40 kg/m3 of activated iron tailings, 930 to 950 kg/m3 of tailing waste rocks, 870 to 880 kg/m3 of tailing fine sand, 155 to 170 kg/m3 of water and 3 to 5 kg/m3 of additives;
• carrying out curing and demolding in sequence on the concrete member to obtain a prefabricated layer;
• and
• casting a laminated layer on the face, provided with the grooves, of the prefabricated layer in situ to obtain the solid waste large-mixing-amount concrete prefabricated laminated slab, wherein a concrete for casting the laminated layer is the solid waste large-mixing-amount concrete;
• wherein the activated iron tailings are prepared through the following method that the iron tailings are sequentially subjected to mechanical activation and thermal activation, the time of mechanical activation is 1-1.5 hours, the temperature of thermal activation is 600-800° C., and the time of thermal activation is 20-30 min;
• and
• the additives consist of the following components:
• a water reducing agent, cellulose ether and dextrin;
• and the mass of the cellulose ether is 0.1-0.2% of the mass of the water reducing agent, and the mass of the dextrin is 1-2% of the mass of the water reducing agent.