| 摘要: |
| 利用CO2气体碳化处理再生微粉替代水泥制备砂浆试样，探究了不同替代率下再生微粉对砂浆水化和性能的影响规律.结果表明：当替代率为20%时，与未经处理的再生微粉相比，碳化再生微粉砂浆的1、3 d抗压强度分别提高了66.7%、17.6%；碳化再生微粉主要成分是CaCO3和无定形硅胶，二者在水泥水化早期可与水泥水化产物反应从而发挥火山灰效应，再生微粉中的微细石英砂粉则发挥成核效应，均加速水泥的早期水化进程，显著提升其早期力学性能；在加速碳化处理过程中，再生微粉的固碳量可达自身质量的10.0%；制备砂浆后，其平均单位抗压强度最高可减少18%的CO2排放. |
| 关键词: 再生微粉 碳化处理 水泥基材料 早期性能 碳足迹 |
| DOI：10.3969/j.issn.1007-9629.2023.11.009 |
| 分类号:TU528.01 |
| 基金项目:国家自然科学基金资助项目（52178235）；广东省自然科学基金资助项目（2022A1515010594）；深圳市新引进高端人才科研启动项目（827000623）；深圳大学青年教师科研启动项目（QNJS0375） |
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| Performance and Carbon Footprint Evaluation of Cement-Based Materials Incorporating Carbonated Recycled Fine Powder |
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MO Yuanyuan1,2, TANG Wei1,2, ZHAN Baojian1,2, KOU Shicong1,2, XING Feng1,2
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1.College of Civil and Transportation Engineering， Shenzhen University， Shenzhen 518060， China;2.Guangdong Province Key Laboratory of Durability for Marine Civil Engineering， Shenzhen University， Shenzhen 518060， China
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| Abstract: |
| Using CO2 gas carbonation treatment to recycled fine powder to replace cement to prepare cement mortars samples， the influence of recycled fine powder on the hydration and performance of mortar under different replacement ratios was investigated. The results show that when the replacement ratio is 20%， compared with the untreated recycled fine powder， the compressive strength of carbonated recycled fine powder mortar at 1 day and 3 days increases by 66.7% and 17.6%， respectively. The main components of the carbonated recycled fine powder are CaCO3 and amorphous silica gel， which can react with the cement hydrates， thereby exerting the volcanic ash effect. The fine quartz sand in the recycled fine powder exhibits nucleation effect， accelerating the early hydration process of cement and significantly improving its early mechanical properties. During the accelerated carbonization process， the carbon sequestration of the recycled fine powder can reach 10.0% of its own mass. After preparing the mortar， its average unit compressive strength can reduce CO2 emissions by up to 18%. |
| Key words: recycled fine powder carbonation treatment cement-based material early performance carbon footprint |
