硅酸盐学报

高地热环境下石灰石煅烧黏土水泥体系砂浆的微结构演变与氯盐传输机理

PDF下载

刘志勇 ¹^,² , 李洋 ¹^,² , 刘宇洁 ¹^,² , 蒋金洋 ¹^,²

硅酸盐学报 | 混凝土耐久性机理表征与预测方法专题—研究论文 2026,54(2): 570-579

收起

硅酸盐学报 |混凝土耐久性机理表征与预测方法专题—研究论文 2026 , 54 (2) : 570 -579

高地热环境下石灰石煅烧黏土水泥体系砂浆的微结构演变与氯盐传输机理

全屏

刘志勇¹^,², 李洋¹^,², 刘宇洁¹^,², 蒋金洋¹^,²

作者信息

^1．东南大学，重大基础设施工程材料全国重点实验室，南京 211189

^2．东南大学材料科学与工程学院，南京 211189

通讯作者:

蒋金洋（1974—），男，博士，教授。

作者简介:

刘志勇（1985—），男，博士，教授。

Microstructural Evolution and Chloride Transport Mechanisms of Calcined Clay Limestone Cementitious Mortar under High Geothermal Condition

Zhiyong LIU¹^,², Yang LI¹^,², Yujie LIU¹^,², Jinyang JIANG¹^,²

Affiliations

^1.State Key Laboratory of Engineering Materials for Major Infrastructure, Southeast University, Nanjing 211189, China

^2.School of Materials Science and Engineering, Southeast University, Nanjing 211189, China

Corresponding Author:

JIANG Jinyang (1974-), male, Ph.D., Professor. E-mail: jiangjinyang16@163.com

LIU Zhiyong (1985-), male, Ph.D., Professor. E-mail: liuzhiyong0728@163.com

出版时间: 2026-02-20 doi: 10.14062/j.issn.0454-5648.20250168

文章导航

摘要

收起

针对现有硅酸盐水泥混凝土无法保障高地热-高盐环境下隧道工程长寿命的难题，本工作采用石灰石煅烧黏土水泥体系作为替代材料，并结合压汞法、X射线衍射分析、核磁共振分析、扫描电子显微镜分析和能量散射光谱分析研究高地热作用下石灰石煅烧黏土水泥体系砂浆的微结构演变机理，建立考虑热伤损累积和吸附固化效应的氯离子传输模型，揭示热损伤程度对氯离子的加速效应。结果表明：高地热服役环境导致石灰石煅烧黏土水泥体系的孔隙率增大到 45.14%，提高了40.36%；平均孔径增大到115.25 nm，提高了356.25%。与传统硅酸盐水泥体系及粉煤灰、石灰石粉、煅烧黏土等二元体系相比，石灰石煅烧黏土水泥体系砂浆在各温度工况下均展现出优异的抗氯离子传输性能。在105 ℃高地热环境中，石灰石煅烧黏土水泥体系的总氯离子含量仅为水泥体系的 83.9%，自由氯离子含量仅为 73.6%，证明石灰石煅烧黏土水泥体系在高地热作用后仍具有显著的抗氯离子侵蚀优势。基于温度梯度和Langmuir非线性吸附机制构建的氯离子传输模型预测结果表明，氯离子浓度随温度升高而显著增大，105 ℃下距离表面2.5 mm处总氯离子含量较20 ℃增加了92%，验证了高地热环境对氯离子扩散的促进作用。

关键词

石灰石煅烧黏土水泥体系 / 高地热隧道 / 氯离子传输 / 微结构损伤

Abstract

收起

Introduction

The existing Portland cement concrete cannot ensure the long-term service life of tunnel engineering in high geothermal and high salinity environments. This work was to adopt a calcined clay limestone cementitious (LC³) system as an alternative material and the microstructural evolution mechanism of LC³ mortar under high geothermal conditions was investigated. A chloride ion transport model for thermal damage accumulation and adsorption-fixation effects was established, and the accelerating effect of thermal damage degree on chloride ion penetration was revealed.

Methods

Raw powders included cement, limestone powder, calcined clay, gypsum, and fly ash. The cement was P·II 52.5 grade Portland cement. The limestone powder consisted of ≥90% CaCO₃. The calcined clay was produced from a clay with a kaolinite content ≥40%. The gypsum was dihydrate gypsum with a purity ≥90%. The fly ash was Class F fly ash. The aggregate was machine-made sand from tunnel muck. Mortar specimens were prepared according to the standard GB/T 17671—1999, China. The LC³ system contained 55% cement, 30% limestone powder, and 15% calcined clay. The specimens were cured under different conditions (i.e., 20 ℃-95%RH, 65 ℃-10%RH, and 105 ℃-10%RH). The microstructure was characterized by mercury intrusion porosimetry (MIP), X-ray diffraction (XRD), nuclear magnetic resonance (NMR), and scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS). The total and free chloride ion contents of the specimens after immersion in 3% NaCl solution were determined. A chloride transport model incorporating temperature gradient and the Langmuir nonlinear adsorption was proposed, and the related results were simulated by a software named COMSOL Multiphysics.

Results and discussion

The results show that a high geothermal exposure leads to significant microstructural deterioration of the LC³ mortar. The porosity increases to 45.14% (i.e., an increase of 40.36%) and the average pore diameter increases to 115.25 nm (i.e., an increase of 356.25%) at 105 ℃, compared to those at 20 ℃. The XRD patterns and the NMR analyses indicate a decomposition of hydration products like portlandite (CH) and ettringite (AFt), and changes in aluminum coordination, reducing the structural stability and chloride binding capacity. The LC³ system demonstrates a superior resistance to chloride ion penetration, compared to plain cement and binary systems (i.e., limestone, calcined clay, or fly ash). At 105 ℃, the total chloride content in LC³ is only 83.9% and the free chloride content is only 73.6% of those in the plain cement system. Based on the prediction by the proposed chloride transport model, an increase of 92% in the total chloride content at 2.5 mm depth at 105 ℃, compared to that at 20 ℃, confirming the promoting effect of high geothermal conditions.

Conclusion

High geothermal conditions could deteriorate the pore structure of LC³ mortar and reduce its resistance to chloride penetration. The LC³ system exhibited the superior performance against chloride ion transport, compared to traditional cement and binary systems under high geothermal conditions, due to the synergistic effect of limestone and calcined clay. The chloride concentration decreased non-linearly with depth, and elevated temperature significantly accelerated the chloride diffusion due to the pore structure coarsening and reduced binding capacity.

Key words

calcined clay limestone cementitious system / high geothermal tunnel / chloride ion transport / microstructural damage

引用本文

刘志勇, 李洋, 刘宇洁, 蒋金洋. 高地热环境下石灰石煅烧黏土水泥体系砂浆的微结构演变与氯盐传输机理. 硅酸盐学报, 2026 , 54 (2) : 570 -579 . DOI: 10.14062/j.issn.0454-5648.20250168

Zhiyong LIU, Yang LI, Yujie LIU, Jinyang JIANG. Microstructural Evolution and Chloride Transport Mechanisms of Calcined Clay Limestone Cementitious Mortar under High Geothermal Condition[J]. Journal of the Chinese Ceramic Society, 2026 , 54 (2) : 570 -579 . DOI: 10.14062/j.issn.0454-5648.20250168

基金

收起

国家自然科学基金重大项目(52293431)
江苏省杰出青年基金项目(BK20220071)

参考文献

收起

文献

收起

参考文献引证文献

排序方式：

2026年第54卷第2期

PDF下载

引用本文

BibTeX

文章信息

doi: 10.14062/j.issn.0454-5648.20250168

接收时间：2025-05-07
首发时间：2026-10-27
出版时间：2026-02-20

补充材料

相关文章

文章信息

作者

出版历史

收稿日期：2025-05-07
修回日期：2025-10-28

基金

国家自然科学基金重大项目(52293431)

江苏省杰出青年基金项目(BK20220071)

作者信息

^1．东南大学，重大基础设施工程材料全国重点实验室，南京 211189

^2．东南大学材料科学与工程学院，南京 211189

通讯作者:

蒋金洋（1974—），男，博士，教授。

参考文献

分享链接

https://castjournals.cast.org.cn/joweb/gsyxb/CN/10.14062/j.issn.0454-5648.20250168

分享至

全文二维码

扫描看全文

引用本文

BibTeX

本文的引用情况

2种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

关闭全屏

BibTeX
EndNote
RefWorks
TxT