Concrete carbonation is an extremely important aspect of concrete durability research, referring to the neutralization process in which the acidic gas CO ₂ in the air reacts with the alkaline substances in the liquid phase of concrete, causing a decrease in alkalinity and a change in chemical composition.
The depth of neutralization is greater than the thickness of the concrete protective layer, which will damage the passive film on the surface of the steel reinforcement.
Under the action of water and air, the steel reinforcement will rust, and the volume expansion of the rust will cause longitudinal cracks and peeling of the protective layer, ultimately leading to a reduction in the cross-section of the component, a decrease in bearing capacity, and even structural damage and loss of effectiveness.
The concentration of CO ₂ in the global atmosphere is increasing year by year, and groundwater is affected by industrial waste and slag, resulting in an increase in CO ₂ and SO ₂ concentrations.
Concrete carbonation has become an engineering problem that cannot be ignored, and conducting relevant research has important practical significance.
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