碳酸盐环境对隧道混凝土性能和微观特征的影响

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (7): 2415-2426.

所属专题：水泥混凝土

碳酸盐环境对隧道混凝土性能和微观特征的影响

李康^1,2, 高萌³, 邹敏⁴, 刘娟红⁴, 谢永江²

1.中国铁道科学研究院研究生部,北京 100081;
2.中国铁道科学研究院集团有限公司,高速铁路轨道系统全国重点实验室,北京 100081;
3.河南工业大学土木工程学院,郑州 450001;
4.北京科技大学土木与资源工程学院,北京 100083

收稿日期:2023-12-15 修订日期:2024-01-08 出版日期:2024-07-15 发布日期:2024-07-24
通信作者: 刘娟红,博士,教授。E-mail:juanhong1966@hotmail.com
作者简介:李康(1994—),男,博士研究生。主要从事铁路混凝土结构耐久性研究和特种混凝土研发工作。E-mail:likangbkd1994@163.com
基金资助:
高速铁路轨道系统全国重点实验室国家创新平台开放基金(2021YJ059);河南省科技攻关项目(222102320092)

Influence of Carbonate Environment on Performance and Microscopic Characteristics of Tunnel Concrete

LI Kang^1,2, GAO Meng³, ZOU Min⁴, LIU Juanhong⁴, XIE Yongjiang²

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 Sciences Corporation Limited, Beijing 100081, China;
3. School of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China;
4. College of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received:2023-12-15 Revised:2024-01-08 Online:2024-07-15 Published:2024-07-24

摘要/Abstract

摘要： 为探索喀斯特岩溶地区铁路混凝土隧道衬砌的侵蚀劣化情况,以普通硅酸盐水泥混凝土、硫铝酸盐水泥混凝土和喷射混凝土为研究对象,并模拟碳酸盐加速腐蚀环境。通过宏观性能测试和X射线衍射分析、傅里叶红外光谱分析、热重分析和扫描电子显微镜等微观测试方法,研究碳酸盐环境对不同种类隧道混凝土宏观性能和微观特征的影响。研究结果表明:混凝土的质量、相对动弹性模量和抗压强度随浸泡龄期的增长呈先增长后下降的趋势,浸泡180 d后开始下降,其中硫铝酸盐水泥混凝土浸泡360 d后的抗压强度低于初始值;侵蚀360 d后,样品原有水化产物中的晶体和凝胶数量急剧减少,并产生大量的碳酸钙;硫铝酸盐水泥混凝土样品中检测到了[Si(OH)₆]^2-八面体基团,证明有碳硫硅钙石生成,以钙矾石为主要水化产物的硫铝酸盐基混凝土受碳酸盐侵蚀影响更为明显。

关键词: 隧道混凝土, 碳酸盐溶液, 碳硫硅钙石, 抗压强度, 水化产物, 微观结构

Abstract: To investigate the erosion and deterioration of railway tunnel lining concrete in karstic areas, this study focuses on ordinary Portland cement concrete and calcium sulfoaluminate cement concrete, as well as shotcrete. An environment of accelerated corrosion through carbonate exposure was simulated. The impact of carbonate environment on the macroscopic properties and microscopic characteristics of different types of tunnel concrete was studied using macroscopic performance testing and microscopic testing methods such as X-ray diffraction analysis, Fourier-transform infrared spectroscopy, thermogravimetric analysis and scanning electron microscopy. The mass, relative dynamic modulus of elasticity and compressive strength of concrete show an initial increase followed by a subsequent decrease with the increase of immersion duration. The decline starts after 180 d of immersion, in which the compressive strength of calcium sulfoaluminate cement concrete is lower than the initial value after immersing for 360 d. Microstructural analysis of the concrete reveals that after 360 d of erosion, the crystals and gels in the original hydration products of the samples sharply decrease, giving rise to a significant amount of calcium carbonate. In the samples of calcium sulfoaluminate cement concrete, [Si(OH)₆]^2- octahedral groups are detected, confirming the formation of thaumasite. The calcium sufoaluminate cement-based concrete with ettringite as the main hydration product is more significantly affected by carbonate erosion.

Key words: tunnel concrete, carbonate solution, thaumasite, compressive strength, hydration product, microscopic structure

中图分类号:

TU528

李康, 高萌, 邹敏, 刘娟红, 谢永江. 碳酸盐环境对隧道混凝土性能和微观特征的影响[J]. 硅酸盐通报, 2024, 43(7): 2415-2426.

LI Kang, GAO Meng, ZOU Min, LIU Juanhong, XIE Yongjiang. Influence of Carbonate Environment on Performance and Microscopic Characteristics of Tunnel Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(7): 2415-2426.

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碳酸盐环境对隧道混凝土性能和微观特征的影响

Influence of Carbonate Environment on Performance and Microscopic Characteristics of Tunnel Concrete

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