2results about How to "Guaranteed volume stability" patented technology

The application discloses a cement concrete surface layer functional gradient material and a preparation method thereof, and has a composite surface layer structure, comprising a first concrete layer and a second concrete layer; the first concrete layer comprises cement, mineral admixture, synthetic fiber, coarse aggregate, fine aggregate, water and a first water reducing agent; the second concrete layer comprises cement, coarse aggregate, fine aggregate, water and a second water reducing agent; the coarse aggregates of the first concrete layer and the second concrete layer are of the same lithology; the linear expansion coefficient of the first concrete layer is 10*10 ‑6 / °C±0.5*10 ‑6 / °C, the linear expansion coefficient of the second concrete layer is 8*10 ‑6 / °C±0.5*10 ‑6 / °C, and the flexural elastic modulus ratio is 1.05-1.1. Through interlayer material collaborative design, the application remarkably improves the anti-freezing, anti-permeation, wear resistance and interlayer deformation coordination, prolongs the service life of the pavement, and is especially suitable for high requirement engineering such as airport pavement.

This invention discloses a method for preparing a ternary solid waste alkali-activated cementitious material based on particle size control, relating to the fields of building materials and solid waste resource utilization technology. The method includes: obtaining three solid waste raw materials—blast furnace slag, red brick powder, and waste glass powder—and setting differentiated target particle size grinding parameters based on their differences in mineral crystal structure and chemical activity; mechanically grinding the three solid waste raw materials separately and detecting the particle size of the three powders after mechanical grinding; dry-mixing the three powders according to a preset mass ratio to prepare a ternary composite precursor; adding an alkali activator solution to the ternary composite precursor and mixing to activate the hydration reaction of the system; and curing under standard curing conditions to obtain the finished cementitious material. This invention employs the above-mentioned method for preparing a ternary solid waste alkali-activated cementitious material based on particle size control, which has the advantages of being low-carbon and environmentally friendly, and while improving early strength, ensures the volume stability of the material in later stages.