The Influence of CO2 Curing on the Mechanical Performance and the Corresponding Chloride Ion Resistance of Alkali-Activated Compound Mineral Admixtures

In this paper, the mechanical properties (the flexural strength, compressive strength and drying shrinkage rate) of CO2-cured alkali-activated compound mineral admixtures (blast furnace slag powder (BFS) fly ash (FA)) are investigated. addition, corresponding chloride ion mobility coefficient is measured. Additionally, freeze–thaw cycles with an NaCl concentration 3% studied. Thermogravimetric analysis scanning electron microscopy applied in analyzing properties. The curing ages 1 day, 3 days 28 days. Results show that strengths decreased by addition FA increased increasing age CO2 curing. maximum reducing rates 47.6% 42.3%. Meanwhile, 26.5% 23.1%, respectively. improving effect BFS higher than FA. Furthermore, rate dosages BFS, dosage leads to decreasing coefficient. Finally, can effectively improve resistance cycles. compactness hydration products improved roughness