![]() ![]() From the pore structure changes perspective, carbonation products filled the interface between the dolomite and amorphous particles. Compared to large particles, smaller particles are more likely to have a better dilution effect, providing more contact surface for carbonated precipitation. The CO2 uptake capacity increased with finer particle size and higher CO2 curing pressures. The optimum w/s ratio for CO2 uptake capacity of DPC‐15% samples was approximately 0.20, while the optimum temperature was equal to 60 ℃ or higher than 60℃. Effects of w/s ratio and temperature on carbonation are two‐sided. For DPC‐25% samples under 2.5 MPa curing pressure, the maximum CO2 uptake capacity reached 23.6 wt%, which was 23% higher than that of pure OPC samples under the same condition. The CO2 uptake capacity, after normalized to carbonation active components, significantly increased with larger. This study aimed at investigating the effects of carbonation curing on the performance of ordinary Portland cement (OPC) pastes with dolomite additive (DPC). ![]() View full-textĬarbonation curing of cement‐based materials has recently received more and more attention as a CO2 utilization technology. The use of MEA and other amines in CO2 capture is a point of concern and a global application does not seem to be the best strategy. In addition, other environmental impacts associated to the toxicity and environmental fate of the solvent have to be considered. Thus, the evaluation of the overall balance of CO2 emitted and captured is essential to determine the efficiency of the process. The regeneration of the solvent after the absorption is also an indirect source of CO2 related to the use of fuels (i.e., combustion processes for energy supply). The production of MEA from ammonia involves important CO2 emissions during the Haber–Bosch process. solvent production, solvent use and regeneration, and environmental effects related to its use/emissions. However, the main concern arises when thinking of the overall process. Process optimization is always required and this research is worth and necessary. Recent research on CO2 capture is focusing on the optimization of CO2 absorption using amines (mainly monoethanolamine-MEA) in order to minimize the energy consumption of this very energy-intensive process and improve the absorption efficiency. ![]()
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