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

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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

Published: 10 November 2024 Online: 2024-11-11

CLC number:

TU528

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	Articles by authors
	WANG Wei
	FAN Zhihong
	ZHAO Jiaqi
	YANG Haicheng

Cite this article:

WANG Wei,FAN Zhihong,ZHAO Jiaqi, et al. Study on Microstructure and Resistance to Chloride Ingress of Cement Paste Under Intense Ultraviolet Irradiation[J]. Materials Reports, 2024, 38(21): 23080026-7.

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http://www.mater-rep.com/EN/10.11896/cldb.23080026 OR http://www.mater-rep.com/EN/Y2024/V38/I21/23080026

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