The paper presents some experimental results regarding the carbonation process of binders/concretes with alkali activated slag correlated with some compositional factors and the implications of this process in the hydration of the binder and mechanical behaviour of hardened concrete. Concretes with different NaOH activated slag binder dosage and different water/binder ratios were used in the experiments. The evolution of the carbonation depth was studied for a period of 2 years, a correlation between the evolution of this process and water/binder ratio being established. The newly formed hydrates during the hardening of the binder and their evolution in normal conditions of carbonation for 2 years, or after accelerated carbonation were studied using X-ray diffraction and differential thermal analysis.
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