Acceleration carbonation is a promising advanced technique to transform solid waste with the aid of CO₂ into stabilized value-added material. In this study, the potential of concrete slurry waste (CSW) as a CO₂ sequester and as new supplementary cementitious material (SCM) were examined. The effects of two process parameters, namely water-to-solid (w/s) ratio and reaction time on maximum CO₂ uptake capacity of CSW were evaluated using response surface methodology (RSM). The response surface indicated that the w/s ratio had a significant effect on CO₂ uptake, and when exceeding 0.4 caused an obvious decrease in CO₂ uptake. This mainly resulted in a liquid saturation and hence hinders the diffusion of CO₂ reaction. As expected, an increase in reaction time enhanced the capability of CO₂ uptake and reached the saturation level at about 72 h. The maximum CO₂ uptake of CSW was 20.4 % (i.e. 204.35 g/kg) at optimal condition (w/s ratio of 0.25 and reaction time of 72 h). Thus, it is roughly estimated that about 4–8 million Mt of CO₂ per annum can be permanently captured from the 19.8–39.6 million Mt of CSW produced yearly. In addition, the carbonated CSW demonstrated a strength activity index of more than 75 and could be potentially regarded as SCM.

加速碳酸化是一种有前途的先进技术，它可以借助CO ₂将固体废物转化为稳定的增值材料。在这项研究中，研究了水泥浆废料（CSW）作为CO ₂隔离剂和新型补充胶凝材料（SCM）的潜力。使用响应表面方法（RSM）评估了两个工艺参数，即水/固体比（w / s）和反应时间对CSW最大CO ₂吸收能力的影响。响应表面表明，w / s比对CO ₂吸收有显着影响，而当w / s超过0.4时，会导致CO ₂吸收明显降低。这主要导致液体饱和，因此阻碍了CO的扩散₂反应。如所期望的，反应时间的增加增强了CO ₂吸收的能力并且在约72h达到饱和水平。在最佳条件下（w / s比为0.25，反应时间为72 h），CSW的最大CO ₂吸收率为20.4％（即204.35 g / kg）。因此，据粗略估计，每年可从每年生产的19.8至3960万公吨的CSW中永久捕获约4至800万公吨的CO ₂。此外，碳酸化的CSW的强度活性指数超过75，有可能被视为SCM。