Accelerated concrete carbonation is an expanding option for decarbonizing construction. Factors such as concrete mixture design and carbonation environment can influence the maximum CO₂ utilization that can be achieved during such a process. A carbonation process designed to utilize a water-saturated dilute CO₂ source wherein 2 < CO₂ concentration (v/v%) < 16, was modeled in AspenPlus©. A regression model was developed to correlate CO₂ uptake, relative humidity (11%–100%), CO₂ concentration ([CO₂] = 2—16 v/v%), and temperature (T = 11–74°C) conditions within a carbonation reactor. It was determined that [CO₂] was the most significant variable as higher concentrations enhanced CO₂ transport through the concrete. The energy use intensity per mass of CO₂ utilized (kWh/kgCO₂) was determined across a range of processing conditions. As a function of the operational conditions, accelerated carbonation provides a net CO₂ reduction of up to 28 kgCO₂/tonne of concrete; a reduction of up to ~45% compared to typical formulations.

中文翻译：

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过程建模指导影响混凝土加速碳化过程中二氧化碳利用率的操作变量

加速混凝土碳化是脱碳建筑的一个扩展选择。诸如混凝土混合物设计和碳化环境等因素可影响在此过程中可实现的最大CO ₂利用率。在AspenPlus©中模拟了设计为利用水饱和的稀CO ₂源的碳酸化过程，其中2 < CO ₂浓度(v/v%) < 16。开发了一个回归模型来关联 CO ₂吸收、相对湿度 (11%–100%)、CO ₂浓度 ([CO ₂ ] = 2–16 v/v%) 和温度 ( T  = 11–74°C)碳酸化反应器内的条件。确定[CO ₂ ]是最重要的变量，因为较高的浓度增强了CO ₂通过混凝土的传输。在一系列加工条件下确定每单位使用质量的CO ₂的能源使用强度（kWh/kgCO ₂ ）。根据操作条件，加速碳化可使 CO ₂净减少量高达 28 kgCO ₂ /吨混凝土；与典型配方相比，减少高达约 45%。