1results about How to "Avoid cracking tendencies" patented technology

This invention relates to the field of low-carbon building materials technology, specifically to a solid waste-based expansive activator and its preparation method. The expansive activator is made from steel slag powder, blast furnace slag powder, fly ash, desulfurized gypsum powder, and modified attapulgite clay powder. Its core innovation lies in a specific two-step mineralization modification of the attapulgite clay: first, an anionic nucleating agent and sodium carbonate are added for the first mineralization step; then, a cationic confinement agent and sodium carbonate are added for the second mineralization step; finally, heat treatment is performed for shaping. This method constructs a stable gradient porous functional layer in situ on the surface of the attapulgite clay. After mixing and pre-hydrating with solid waste raw materials, it can synergistically reduce the water demand of the cementitious system, promote the growth of hydration products to improve early strength, and significantly inhibit drying shrinkage by uniformly distributing the expansive components through anchoring. This invention effectively solves the technical problems of low early strength and poor volume stability in solid waste-based low-carbon cementitious materials.