High-flowability grouting material with high content of construction waste fine powder and preparation method thereof

Abstract

This invention discloses a high-volume, high-flowability grouting material made from fine construction waste powder, comprising, by weight, 150-200 parts cement, 100-200 parts fly ash, 600-800 parts graded fine construction waste powder, 420-750 parts water, and a modified admixture system; the graded fine construction waste powder is composed of four particle size ranges of 0.075mm, 0.15mm, 0.3mm, and 0.6mm, with proportions of 35%-50%, 35%-50%, 8%-12%, and 0%-12%, respectively; the modified admixture system includes at least one of water glass, quick-setting cement, calcium formate, powdered water-reducing agent, and powdered water glass. This invention uses fine aggregate that 100% replaces natural sand, with a total fine powder content of over 50% from construction waste. The slurry has a fluidity of 260–280 mm, no sedimentation or segregation, adjustable setting time, a bulk density of 1340–1560 kg / m³, and a consolidation rate of 91%–97%. It combines the advantages of high fluidity, controllable setting, and high-value utilization of solid waste. The process is simple and suitable for grouting projects such as tunnels, foundation pits, pipe galleries, and roadbeds.