强辐照作用下水泥浆体微结构与抗氯离子侵蚀性能研究

doi:10.11896/cldb.23080026

材料导报

2024, Vol. 38

Issue (21): 23080026-7 https://doi.org/10.11896/cldb.23080026

无机非金属及其复合材料

强辐照作用下水泥浆体微结构与抗氯离子侵蚀性能研究

汪伟^1,2,*, 范志宏^1,2,3, 赵家琦^1,2, 杨海成^1,2,3

1 中交四航工程研究院有限公司,广州 510230
2 水工构造物耐久性技术交通行业重点实验室,广州 510230
3 海洋基础设施长期性能交通运输行业野外观测研究基地,广东湛江 524000

Study on Microstructure and Resistance to Chloride Ingress of Cement Paste Under Intense Ultraviolet Irradiation

WANG Wei^1,2,*, FAN Zhihong^1,2,3, ZHAO Jiaqi^1,2, YANG Haicheng^1,2,3

1 CCCC Fourth Harbor Engineering Institute Co., Ltd., Guangzhou 510230, China
2 Key Laboratory of Harbor & Marine Structure Durability Technology of Transport Industry, Guangzhou 510230, China
3 Observation and Research Base of Transport Industry of Long-term Performances of Marine Infrastructure, Zhanjiang 524000, Guangdong, China

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摘要以南海为代表的远海海洋服役环境恶劣,具有高温、高湿、高盐、高辐照的环境特点。现有研究表明辐照会改变水泥浆体的组成与结构,但对水泥浆体耐久性的影响常被忽略。为阐明强辐照作用对水泥浆体微结构与抗氯离子侵蚀性能的影响,本研究利用紫外线耐气候试验箱进行加速模拟实验,并与水养、室内环境进行对比分析,表征了不同条件下水泥的浆体吸水率、碳化深度、物相组成、孔结构与氯离子固化能力,并在紫外辐照-干湿循环耦合作用条件下进行了氯离子侵蚀实验。结果表明,辐照时间由500 h增加至1 500 h,浆体的最可几孔径由135.8 nm增大至283.8 nm,孔隙率由25.0%增大至29.5%,孔结构劣化,氯离子扩散通道增加。同时,强辐照造成AFm、水化硅酸钙凝胶(C-S-H)等水化产物碳化分解,导致水泥浆体的氯离子固化量由51.9 mg/g下降至23.9 mg/g。此外,长期辐照耦合干湿循环作用产生的温度应力会增大浆体开裂的风险,裂纹会显著降低浆体的抗氯离子侵蚀能力。

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	汪伟
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	杨海成

关键词: 辐照作用干湿循环微结构氯离子固化能力抗氯离子侵蚀

Abstract: The service environment to concrete structures in far sea represented by the South China Sea is harsh, with the characteristics of high temperature, high humidity, high salt content and intense ultraviolet irradiation. Existing studies have shown that irradiation can change the composition and structure of cement paste, but the effects on the durability of cement paste is easy to ignore. In order to clarify the effects of irradiation on the microstructure and resistance to chloride attacks of cement paste, the accelerated simulation experiment was carried out by using ultraviolet climate chamber, and compared with water curing and room environment. The capillary water absorption, carbonation depth, phase composition, pore structure and chloride binding capacity of cement paste under different conditions were characterized, and the chloride ingress experiment was carried out under the coupling condition of dry-wet cycle and irradiation. The results show that with the irradiation time increases from 500 h to 1 500 h, the most probable pore diameter of the paste increases from 135.8 nm to 283.8 nm, the porosity increases from 25.0% to 29.5%, the pore structure deteriorates, and the chloride diffusion channel increases. At the same time, intense irradiation caused the carbonation decomposition of hydration products such as AFm and C-S-H, resulting in the chloride binding capacity of cement paste decreased from 51.9 mg/g to 23.9 mg/g. In addition, the temperature stress caused by long-term irradiation coupled with dry-wet cycles will increase the cracking risks of paste and the crack will significantly deteriorate the resistance to chloride attacks.

Key words: irradiation effect dry-wet cycle microstructure chloride binding capacity chloride resistance

出版日期: 2024-11-10 发布日期: 2024-11-11

ZTFLH:

TU528

通讯作者: *汪伟,2019年6月、2022年6月分别于安徽工业大学和华南理工大学获得工学学士学位和硕士学位。现任职于中交四航局工程研究院有限公司。主要研究领域为建筑材料耐久性、海工混凝土材料。1121879948@qq.com

引用本文:

汪伟, 范志宏, 赵家琦, 杨海成. 强辐照作用下水泥浆体微结构与抗氯离子侵蚀性能研究[J]. 材料导报, 2024, 38(21): 23080026-7.
WANG Wei, FAN Zhihong, ZHAO Jiaqi, YANG Haicheng. Study on Microstructure and Resistance to Chloride Ingress of Cement Paste Under Intense Ultraviolet Irradiation. Materials Reports, 2024, 38(21): 23080026-7.

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http://www.mater-rep.com/CN/10.11896/cldb.23080026 或 http://www.mater-rep.com/CN/Y2024/V38/I21/23080026

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