湿法碳化再生微粉性能评价及水泥净浆早期强度形成机理研究

doi:10.16552/j.cnki.issn1001-1625.2024.1206

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (5): 1834-1840.DOI: 10.16552/j.cnki.issn1001-1625.2024.1206

湿法碳化再生微粉性能评价及水泥净浆早期强度形成机理研究

刘晨晨¹, 谢祥兵², 李广慧^2,3, 司马笑情¹, 张艺林¹, 司斌², 邵景干⁴

1.郑州航空工业管理学院材料学院,郑州 450046;
2.郑州航空工业管理学院土木与环境学院,郑州 450046;
3.河南水利与环境职业学院,郑州 450008;
4.河南交院工程技术集团有限公司,郑州 450046

收稿日期:2024-10-12 修订日期:2024-12-16 发布日期:2025-05-20
通信作者: 谢祥兵,博士,副教授。E-mail:xiexiangbing@zua.edu.cn
作者简介:刘晨晨(1999—),女,硕士研究生。主要从事低碳混凝土方面的研究。E-mail:16639038060@163.com
基金资助:
河南省重点研发专项(241111240400);国家自然科学基金(51378474);中原科技创新领军人才中原千人计划(194200510015);河南省自然科学基金面上项目(242300421257);郑州航院研究生教育创新计划基金(2024CX115);河南省交通运输科技计划项目(2016-2-3,2017J8,2021T7,2021J5)

Performance Evaluation of Wet Carbonization Recycled Sand Powder and Formation Mechanism of Early Strength of Cement Paste

LIU Chenchen¹, XIE Xiangbing², LI Guanghui^2,3, SIMA Xiaoqing¹, ZHANG Yilin¹, SI Bin², SHAO Jinggan⁴

1. School of Materials Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450046, China;
2. School of Civil Engineering and Environment, Zhengzhou University of Aeronautics, Zhengzhou 450046, China;
3. Henan Vocational College of Water Conservancy and Environment, Zhengzhou 450008, China;
4. Henan Jiaotong Institute Engineering Technology Group Co., Ltd., Zhengzhou 450046, China

Received:2024-10-12 Revised:2024-12-16 Online:2025-05-20

摘要/Abstract

摘要： 再生微粉(RCSP)干法碳化效率较低,限制了RCSP资源化利用。本文研究了湿法碳化处理对RCSP的性能影响,以及不同替代率下RCSP对水泥净浆水化和性能的影响规律。结果表明,湿法碳化再生微粉(WRCSP)中CaCO₃的含量高达77.06%(质量分数),CO₂封存量为每千克RCSP吸收0.53 kg CO₂。当WRCSP的替代率为20%(质量分数)时,水泥净浆7 d抗压强度达到45.3 MPa,相较RCSP和PC,其抗压强度分别提高了76.3%和4.61%。WRCSP主要碳化产物是多晶态碳酸钙和高聚合度硅胶,这两者能够与水泥水化产物发生反应,加速水泥的早期水化,显著提高水泥的早期力学性能。综上所述,湿法碳化处理后的固碳能力越高,WRCSP作为水泥替代品的性能越好。结论验证了湿法碳化RCSP的可行性,并为未来的工业实践提供了参考。

关键词: 再生微粉, 湿法碳化, 碳化产物, 力学性能, 硅胶

Abstract: The low efficiency of dry carbonization for recycled concrete sand powder (RCSP) limits the utilization of RCSP resources. In this paper, the effects of wet carbonization treatment on the properties of RCSP and the influence of RCSP on the hydration and properties of cement paste at different replacement ratios were investigated. The results show that the CaCO₃ content in the wet carbonization recycled sand powder (WRCSP) is as high as 77.06% (mass fraction), and the CO₂ sequestration amount amounts to 0.53 kg CO₂ absorbed by each kilogram of RCSP. When the replacement ratio of WRCSP is 20% (mass fraction), 7 d compressive strength of cement paste is 45.3 MPa, showing increases of 76.3% and 4.61% compared to RCSP and PC, respectively. The main carbonization products of WRCSP are polycrystalline calcium carbonate and high polymerization silica gel, which can react with the hydration products of the cement, accelerate the early hydration of the cement, and significantly enhance the early mechanical properties of the cement. In summary, the higher the carbon fixation capacity after wet carbonization treatment is, the better the performance of WRCSP as a substitute for cement is. This conclusion verifies the feasibility of wet carbonization of RCSP and provide reference for future industrial applications.

Key words: recycled concrete sand powder, wet carbonization, carbonization product, mechanical property, silica gel

中图分类号:

X799.1

刘晨晨, 谢祥兵, 李广慧, 司马笑情, 张艺林, 司斌, 邵景干. 湿法碳化再生微粉性能评价及水泥净浆早期强度形成机理研究[J]. 硅酸盐通报, 2025, 44(5): 1834-1840.

LIU Chenchen, XIE Xiangbing, LI Guanghui, SIMA Xiaoqing, ZHANG Yilin, SI Bin, SHAO Jinggan. Performance Evaluation of Wet Carbonization Recycled Sand Powder and Formation Mechanism of Early Strength of Cement Paste[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(5): 1834-1840.

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湿法碳化再生微粉性能评价及水泥净浆早期强度形成机理研究

Performance Evaluation of Wet Carbonization Recycled Sand Powder and Formation Mechanism of Early Strength of Cement Paste

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