CO₂ Seeding Admixtures for Enhanced Concrete Activation

In this study, on-site CO2 seeding admixtures were prepared using power ultrasound-assisted pre-carbonation and chelator-assisted pre-carbonation (GLTA, EDTA) to enhance the carbonation efficiency and mechanical properties. Studies have shown that the application of power ultrasound can achieve a maximum CO2 uptake of 9.0% of the binder during the preacarbontion process. Compared with those of the traditional mixing batch and ordinary carbonation seeding activated batch, the strength of the power ultrasound seeding activated batch increased by 27.2 % and 21.4 %, respectively, after 1 day. Additionally, the EDTA-assisted pre-carbonation can achieve a maximum CO2 uptake of 9.6% of the binder during the preacarbontion process. Both early and later age strengths of cement mortar were enhanced by 21.33% at 1 day, 19.16% at 3 days, 16.00% at 7 days, and 16.38% at 28 days.