Features of accelerated carbonization of concrete based on alkaline-alkaline earth binders

Studies of the resistance of concretes based on alkali-alkaline earth binders to carbonation are of significant scientific and practical interest in connection with the development of technologies for reducing the carbon footprint in building materials science. These technologies make it possible to ensure the disposal of industrial waste in construction and reduce the use of Portland cement. The article presents the results of a study of the features of the accelerated carbonation of concrete based on dust removal from the mineral wool production cupola at a carbon dioxide concentration of 10% vol. d. Samples with a water-cement ratio of 0.45, 0.55, 0.60 were tested. An aqueous solution of caustic soda with a concentration of 6 mol/l was used as an alkaline activator. It is established that the carbonation rate of the samples has a damping character and is expressed as a power function of the carbonization depth over time. The results of changes in compressive strength before and after carbonation are presented, showing an increase in residual compressive strength due to the use of a low-base binder. The main product of accelerated carbonation is nahcolite.