Abstract: Fiber reinforcedalkali-activated composites has unique properties such as low carbon environmental protection, high ductility and high durability, and has broad development prospects in various engineering fields such as earthquake resistance, corrosion resistance and frost resis-tance. Conventional research on frost resistance of this material is mainly based on uncracked intact specimens. However, the climatic conditions in seasonally freeze thawing areas make service concrete more likely to crack. In view of this, the frost resistance properties of pre-damaged and un-damaged alkali-activated slag/fly ash composites (AASFC) in chlorine solution and water environment were studied here. The compressive strength, relative mass, chloride ion erosion degree, chloride ion diffusion coefficient, microstructure, sectional structure and sustainability of the specimens after freeze-thaw cycles were analyzed. The results show that AASFC has a good frost resistance. After 300 freeze-thaw cycles in water environment and chloride solution, the compressive strength of pre-damaged samples only decreases by 14.3% and 16.6%, and the mass loss rate is only 5.75% and 4.9%. The chloride ion penetration depth and diffusion coefficient of the pre-damaged samples are small. Under different freeze-thaw conditions, the apparent porosity of pre-damaged sample increases first and then decreases, and the pore diameter in chloride solution is larger.
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2025, Vol. 39 
