Description
Concrete has the potential to sequester CO2. However, the extent of carbonation is proportional to the degree of hydration of cement. On the other hand, steel slag, a by-product from the steel-making industry, can react with CO2 directly due to its reactive gamma–C2S morph. Introducing steel slag by partially replacing cement and taking advantage of more CO2 exposure surface area by 3D printing can help improve the sequestration capability of the steel slag-based 3D printable material. This study evaluates the CO2 uptake potential of steel slag-based 3D printable concrete using different quantification methods. CO2 uptake efficiency is analyzed by calculating the mass gain after carbonation, using a phenolphthalein indicator and thermal analysis. The results of 3D printed specimens are compared with casted specimens of steel slag-based concrete and conventional concrete. Further, steel slag's potential to uptake CO2 in comparison with conventional concrete is investigated.
