Mineral admixtures such as fly ash and slag powder can not only improve the workability and mechanical properties of concrete, but also significantly enhance its durability.
However, the extensive use of mineral admixtures has a complex impact on the carbonation performance of concrete.
On the one hand, the active substances in the admixtures combine with the hydrated calcium hydroxide of cement, reducing the content of alkaline substances in the concrete and accelerating the carbonation process; On the other hand, the addition of admixtures can effectively improve the compactness of concrete materials, enhance the microstructure of the interface transition zone, reduce the penetration of carbon dioxide, and thus slow down the carbonation rate.
Therefore, understanding the influence of mineral content on the carbonation performance of concrete materials and revealing the micro mechanism of mineral admixtures on concrete carbonation behavior is of great significance for optimizing concrete mix proportions, improving the service life of concrete structures, and reducing carbon emissions in the construction industry.
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