Multifunctional activating agent, solid waste based foam concrete and preparation method

The invention relates to the technical field of building materials, and discloses a multifunctional activator, solid waste based foam concrete and a preparation method. The multifunctional activating agent is prepared by rapidly stirring carbonate and/or bicarbonate of alkali metal and sulfate and/or sulfate double salt of alkali metal according to the mass part ratio of 1: 1-1: 2, and positive and negative charges are adsorbed on the surfaces of the carbonate and/or bicarbonate of the alkali metal and the sulfate and/or sulfate double salt of the alkali metal respectively due to mechanical friction; the activating agent not only can activate solid waste, but also has the functions of a foaming agent, a coagulation accelerator, an early strength agent and an expanding agent. The solid waste based foam concrete is prepared from the ordinary Portland cement, the solid waste, the activating agent, the water and the foam stabilizer according to the specified mass parts, and the activating agent is a multifunction