Room temperature curable quick-setting high-strength alkali-activated fly ash cementitious material and preparation method thereof

A room temperature curable quick-setting high-strength alkali-activated fly ash cementitious material,

• wherein raw materials of the cementitious material only comprise:
• in parts by mass, water, undisturbed fly ash 30-50 parts, highly reactive ultra-fine fly ash 50-70 parts, and sodium hydroxide 12-18 parts,
• wherein the cementitious material is prepared by mixing the sodium hydroxide with 2-3 parts of the highly reactive ultra-fine fly ash to obtain a pre-activated solution, and mixing the obtained pre-activated solution with the undisturbed fly ash, and the rest of the highly reactive ultra-fine fly ash,
• wherein the undisturbed fly ash is class I fly ash, and the highly reactive ultra-fine fly ash is a product of the undisturbed fly ash being ball-milled to a median particle size of 2-3 micrometers (μm) with a specific surface area of not less than 624.36 m2/kg.