Polygenetic solid waste-based geopolymer hydraulic jet concrete for cold regions and construction method thereof

Abstract

The application relates to a cold-region geopolymer hydraulic jet concrete based on multiple solid wastes and a construction method, and belongs to the technical field of geopolymer concrete. The method is characterized in that: a composite precursor is composed of slag powder, retired fan blade micro powder, red brick micro powder and nano silicon dioxide; a composite alkali activator is composed of instant potassium silicate and sodium metasilicate pentahydrate; rubber powder and retired fan blade fibers are used as additives; polyvinyl alcohol is used as a modifier; sand, stone and stone powder are used as aggregates; and a geopolymer hydraulic jet concrete is formed. During construction, a twice-alkali-activation method is adopted, so that the mixture can be quickly coagulated after being sprayed, the requirements of hydraulic tunnel support can be met, instant potassium silicate can be used as a first-activated alkali activator to effectively inhibit the frost return phenomenon of geopolymer concrete, the geopolymer can be modified by polyvinyl alcohol to increase the bonding strength, reduce the jet rebound rate, improve the anti-cracking performance, improve the anti-freezing and thawing performance and the anti-permeability of the geopolymer, and provide a strong guarantee for the safety of the hydraulic tunnel.

Images