## 4 Conclusions  
In conclusion, the investigation into the effects of varying the parameters of the carbonation reaction, such as temperature, CO\({}_{2}\) concentration, and relative humidity, on the carbonation of different types of RAs has led to several findings:  
* Firstly, higher carbonation temperatures, mainly at 60 \({}^{\circ}\)C, lead to higher CO\({}_{2}\) uptake in shorter periods of exposure for most MRAs. Increasing the temperature shows promise for industrial applications, especially for RAs with higher initial CO\({}_{2}\) absorption potential. * Secondly, the CO\({}_{2}\) concentration plays a significant role in the carbonation process. Environments richer in CO\({}_{2}\), especially at 25%, promote higher CO\({}_{2}\) uptake. As the concentration of CO\({}_{2}\) in the environment increased, both types of aggregates demonstrated a greater ability to sequestrate CO\({}_{2}\). This finding indicates that higher CO\({}_{2}\) levels during carbonation treatments may improve the carbon capture potential of both RCA and MRA. * Third, a reduction in carbonation relative humidity below 60% consistently results in reduced CO\({}_{2}\) absorption for most RAs studied (MRA, RCA, and CA-L). Lower humidity limits water availability, which is crucial for the carbonation reaction, leading to a decrease in CO\({}_{2}\) uptake. However, not all cases exhibit a prolonged reaction time. In conclusion, this study offers valuable insights for the industrial application of forced carbonation in RAs. The optimal conditions for maximum CO\({}_{2}\) sequestration were determined to be a temperature of 23 \({}^{\circ}\)C, an RH of 60%, and a CO\({}_{2}\) concentration of 25%, achieved by the RA  
Figure 13: Weight loss due to decarbonation before and after forced carbonation, considering the time at which maximum CO\({}_{2}\) uptake was achieved for CA-L at 60 and 50%. RCA-IW1. Under these conditions, the optimal duration of the carbonation process was 12 h to achieve maximum capture. For industrial applications, this study identifies 60 \({}^{\circ}\)C, 60% relative humidity, and a CO\({}_{2}\) concentration of 25% as the most appropriate operating conditions. Although these are not the conditions under which the highest CO\({}_{2}\) capture was achieved, they resulted in notable capture values within a shorter carbonation time: between 1 and 3 h.  
RAs exhibited a significant CO\({}_{2}\) capture potential, ranging from 52 to 348 kg of CO\({}_{2}\) per tonne of cement paste. The findings from this research have considerable potential in terms of industrial applications in the cement industry. By identifying the ideal conditions for CO\({}_{2}\) sequestration in real-life RAs, industries can enhance the CO\({}_{2}\) uptake efficiency of the process. The optimized carbonation process can assist the cement and construction industries in achieving carbon neutrality targets by 2050, in line with global environmental regulations and sustainability goals. Additionally, this process adds value to construction and demolition waste, supporting a circular economy. The clear identification of these optimal parameters and the effects of their variation can help the transition of this technology from laboratory scale to industrial scale, and can also lead to reduced operational costs. If this process can be applied in the industry, it can help mitigate the environmental impacts of cement production and increase the likelihood of achieving the carbon neutrality targets by 2050. Conceptualization, D.B., C.B.F., C.M.P., R.V. and A.S.S. ; Methodology, D.B., C.B.F., C.M.P., R.V. and R.I.G. ; Formal analysis, C.B.F., C.M.P., R.V. and A.S.S. ; Investigation, D.B. ; Writing--original draft, D.B. ; Writing--review & editing, C.B.F., C.M.P., R.V., J.A.B., R.I.G.s and A.S.S. ; Supervision, C.B.F., C.M.P., R.V., J.A.B. and A.S.S. ; Project administration, R.V. All authors have read and agreed to the published version of the manuscript. This work was supported by Interface Mission [Notice No. 01/C05-i02/2022]. Not applicable.