| 摘要: |
| 对比了多种水泥基材料在碳酸水加速侵蚀前后的抗压强度、材料内部的物相迁移和孔结构特征.结果表明：碳酸水侵蚀后水泥基材料强度的发展受到限制，Ca（OH）2和CaCO3含量同时降低，孔径粗化且有害孔的比例增大；以水化硅酸钙凝胶和Ca（OH）2为主要水化产物的胶凝体系最容易受到碳酸水的侵蚀，且Ca（OH）2含量越高，水泥基材料抗碳酸水侵蚀的能力越弱；以钙矾石为主要水化产物的胶凝体系抗碳酸水侵蚀的能力明显增强. |
| 关键词: 隧道水泥基材料 碳酸水侵蚀 物相分析 孔结构 Rietveld法 |
| DOI：10.3969/j.issn.1007-9629.2024.05.004 |
| 分类号:TU528.041 |
| 基金项目:中国铁道科学研究院集团有限公司科研项目（2021YJ059）；国家自然科学基金资助项目（52293430） |
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| Erosion Characteristics of Tunnel Cement-Based Materials in Carbonated Water |
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LI Kang1,2,3, ZOU Min4, WANG Xi2,3, XIE Yongjiang2,3, LIU Juanhong4
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1.Postgraduate Department， China Academy of Railway Sciences， Beijing 100081， China;2.State Key Laboratory for Track System of High-Speed Railway， China Academy of Railway Science Co.， Ltd.， Beijing 100081， China;3.Railway Engineering Researd Institute， China Academy of Railway Sciences Co.， Ltd.， Beijing 100081， China;4.College of Civil and Resource Engineering， University of Science and Technology Beijing， Beijing 100083， China
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| Abstract: |
| Compressive strength，internal phase migration and pore structure characteristics of various cementitious materials before and after accelerated erosion by carbonated water were compared. The results show that the strength development is limited after carbonated water erosion， the Ca（OH）2 and CaCO3 contents are reduced at the same time， the pore size becomes larger and the proportion of harmful pores increases. The cementitious system with hydrate calcium silicate gel and Ca（OH）2 as the main hydration products is most vulnerable to carbonated water erosion， and the cement-based material with higher content of Ca（OH）2 has weaker resistance to carbonated water. The resistance of carbonated water erosion of the cementitious system with ettringite as the main hydration product is significantly enhanced. |
| Key words: tunnel cement-based material carbonated water erosion phase analysis pore structure Rietveld method |
