Properties of Cement-Based Mortars Substituted By Carbonated Fly Ash And Carbonated Under Supercritical Conditions

摘要

Activated carbonation under supercritical conditions is conducted to effectively capture CO_2 in cement-based mortars substituted by carbonated fly ash (CFA). Additionally, the aging effect on the compressive strength was investigated by further aging the mortars for 7 days after the supercritical carbonation process. After the additional aging, up to 40% enhancement in the compressive strength of the mortars was observed in all investigated mortars, irrespective of the CFA substitution ratio. The denser the structure of the mortar, the smaller the carbonation depth. In the case of dense samples, CO_2 cannot penetrate the specimens to a sufficient extent because of their dense surface morphology. The CO_2 storage capacities of the mortars, as measured by TG/DSC analysis, were in the range 3.81-5.04%. Additional water after the supercritical carbonation process and extra time for further aging and carbonation would be helpful in enhancing the percentage of carbonation in future research.