The effect of incorporation of recycled powder and CO₂ absorption of concrete was not considered in the previous life cycle assessment studies. This study evaluated the carbon emission of recycled concrete with different replacement rate of recycled powder and recycled coarse aggregate, taking the carbon absorption in storage and service phase into consideration. The carbon absorption model of recycled concrete with recycled powder was optimized and validated by rapid carbonization tests. It is found that concrete with recycled powder has favorable carbon absorption capacity and can greatly reduce carbon emission. The carbon emission of recycled concrete with recycled powder decreased 12.4–52.2% when compared to normal concrete, and with the increase in the replacement of recycled materials, this advantage becomes more obvious. The evaluation results show that the raw material production and transportation phase are the two main contributors to the carbon emission of recycled concrete, accounting for 67.03–85.81% and 4.01–15.27%, respectively. The evaluation results also show the compensation benefits in storage and service phase from carbon absorption account for 1.58–26.93%. Meanwhile, the long‐distance delivery of natural coarse aggregates makes it possible for recycled concrete to be widely applied.

中文翻译：

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考虑到通过碳化吸收吸收CO2的再生材料制成的混凝土的碳排放分析

掺入再生粉和CO _2的效果在先前的生命周期评估研究中未考虑混凝土的吸收。这项研究评估了再生混凝土的碳排放量，其中考虑了在储存和使用阶段的碳吸收率，其中再生粉末的替代率与再生粉和再生粗骨料的替代率不同。通过快速碳化试验优化并验证了再生粉与再生粉的碳吸收模型。发现具有再生粉末的混凝土具有良好的碳吸收能力并且可以大大减少碳排放。与普通混凝土相比，含再生粉的再生混凝土的碳排放量减少了12.4–52.2％，并且随着再生材料替代量的增加，这一优势变得更加明显。评价结果表明，原材料生产和运输阶段是再生混凝土碳排放的两个主要因素，分别占67.03–85.81％和4.01–15.27％。评价结果还表明，碳吸收在存储和服务阶段的补偿收益占1.58–26.93％。同时，天然粗骨料的长距离输送使再生混凝土得以广泛应用。