干旱区生态环境知识资源中心(Arid): Microstructure and chloride transport of aeolian sand concrete under long-term natural immersion

Arid

DOI	10.1515/secm-2022-0242
	Microstructure and chloride transport of aeolian sand concrete under long-term natural immersion
	Dong, Wei; Sun, AnQi; Zhou, Menghu
通讯作者	Sun, AQ
来源期刊	SCIENCE AND ENGINEERING OF COMPOSITE MATERIALS
ISSN	0792-1233
EISSN	2191-0359
出版年	2024
卷号	31 期号:1
英文摘要	River sand was consumed in large quantities, and alternatives to river sand were urgently needed. There are a large number of natural resources of aeolian sand in western China. Aeolian sand was prepared into aeolian sand concrete (ASC). It can greatly reduce the consumption of river sand and inhibit the process of desertification to protect the environment. ASC is a new type of concrete material prepared by using aeolian sand as fine aggregate. To clarify the chloride ion transport behaviour in the ASC under long-term natural immersion, the aeolian sand was 100% substituted for the river sand to prepare the full ASC with three water-binder ratios. The ASC was naturally immersed in 3 and 6% NaCl solutions for a long time, and nuclear magnetic resonance and microscopic scanning electron microscopy techniques were used. The change rule of chloride ion content at different depths of the ASC was studied, and its microstructure characteristics under different erosion times were analysed. The results showed that the free chloride ion concentration at different depths of the ASC increased with increasing water-binder ratio, immersion time, and chloride concentration. After soaking in the salt solution, the hydration products in the ASC reacted with chloride ions to form Friedel salt, which filled the internal pores and microcracks of the ASC, improved its interface transition zone structure, and increased the compactness of the test piece. The porosity of the three groups of ASC with different water-binder ratios decreased by 0.95, 1.03, and 1.15% after soaking in 6% salt solution for 12 m. To study the diffusion law of chloride ions in ASC, combined with influencing factors such as temperature, humidity, D value, deterioration effect and chloride ion combination, Fick's second law was modified, and a chloride ion diffusion model of ASC with high accuracy was established, with a fitting correlation number above 0.93, which provided a reference for the research and application of ASC in saline areas.
英文关键词	concrete aeolian sand water-binder ratio chloride ion chloride diffusion mode
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:001183142700001
WOS关键词	DIFFUSION
WOS类目	Materials Science, Composites
WOS研究方向	Materials Science
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/405410
推荐引用方式 GB/T 7714	Dong, Wei,Sun, AnQi,Zhou, Menghu. Microstructure and chloride transport of aeolian sand concrete under long-term natural immersion[J],2024,31(1).
APA	Dong, Wei,Sun, AnQi,&Zhou, Menghu.(2024).Microstructure and chloride transport of aeolian sand concrete under long-term natural immersion.SCIENCE AND ENGINEERING OF COMPOSITE MATERIALS,31(1).
MLA	Dong, Wei,et al."Microstructure and chloride transport of aeolian sand concrete under long-term natural immersion".SCIENCE AND ENGINEERING OF COMPOSITE MATERIALS 31.1(2024).