To improve the durability of fly ash concrete,fly ash concrete was used as the object to analyze the effects of different alka-line activator dosages(0%,5%,8%,and 10%)on the quality loss rate,relative dynamic elastic modulus,and compressive strength of fly ash concrete.Microscopic analysis of the alkali excitation process in fly ash concrete was conducted using scanning electron mi-croscopy(SEM)and EDS spectroscopic diffraction patterns.The results showed that with the increase of alkaline activator dosage,the compressive strength of alkali activated fly ash concrete at different curing times showed a trend of first increasing and then decreasing.The quality loss rate of fly ash concrete with four different alkaline activator dosages increased with the increase of freeze-thaw cycles,and the quality loss rate of fly ash concrete was the smallest when the alkaline activator dosage was 8%;the relative dynamic elastic modulus of fly ash concrete with four different alkaline activator dosages decreased with the increase of freeze-thaw cycles,and the de-crease in relative dynamic elastic modulus of fly ash concrete was the smallest when the alkaline activator dosage was 8%;the compres-sive strength of fly ash concrete with four different alkaline activator dosages decreased with the increase of freeze-thaw cycles.When the alkaline activator dosage was 8%,the compressive strength of fly ash concrete was the highest and the decrease in compressive strength was the smallest.The main elements of fly ash concrete with two alkaline activators(0%,8%)were Ca,O,C,Si,and S.When the dosage of the alkaline activator was 8%,it could effectively promote the hydration reaction of fly ash concrete,increase the hydration product content of cementitious materials,and improve the mechanical and durability properties of fly ash concrete.
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