干旱区生态环境知识资源中心(Arid): Properties of saline soil stabilized with fly ash and modified aeolian sand

Arid

DOI	10.1016/j.cscm.2024.e03503
	Properties of saline soil stabilized with fly ash and modified aeolian sand
	Chen, Yuanqing; maimait, Akelamjiang.; Cheng, Jianjun; Duan, Yanfu; Yin, Dawei; Dong, Hongguang; Li, Yupeng
通讯作者	Cheng, JJ
来源期刊	CASE STUDIES IN CONSTRUCTION MATERIALS
ISSN	2214-5095
出版年	2024
卷号	21
英文摘要	Against the backdrop of saline soil solidification and the resource utilization of solid waste and aeolian sand in cold and arid regions, this study employs locally accessible fly ash and aeolian sand to solidify saline soil. By combining unconfined compressive strength tests, X-ray diffraction analysis, scanning electron microscopy, orthogonal experiments, and single-factor analysis, the strength characteristics, mineral composition, and interfacial structure changes of saline soil solidified with different freeze-thaw cycles and varying amounts of fly ash, aeolian sand, and alkali activators were investigated. The effects of each factor were analyzed to determine the optimal mixture ratio and to explore the solidification mechanism.The results indicate that the unconfined compressive strength of saline soil is most significantly enhanced when solidified with a combination of fly ash, aeolian sand, and alkali activators. The optimal mixture ratio was found to be 24 % fly ash, 7 % aeolian sand, and 4.5 mol/L alkali activator. With the incorporation of these solidifying materials, the failure mode of saline soil transitions from plastic to brittle, and the stress-strain curve exhibited a strain-softening behavior. The combined solidification method demonstrated the most pronounced effect in mitigating freeze-thaw damage, with the unconfined compressive strength of the solidified soil reaching 7.01 MPa after seven freeze-thaw cycles, compared to 0.03 MPa for the untreated soil, an increase by a factor of 234.This significant enhancement is attributed to the formation of substantial gel substances, which mitigate the strength loss caused by freeze-thaw cycles. The gel locking mechanism between particles in the solidified soil far exceeds the detrimental effects of freeze-thaw cycles, effectively inhibiting freeze-thaw deterioration. Additionally, the reaction pathways involving AFt and AFm phases reduce the content of SO 4 2- and Cl-in- in the solidified soil, effectively suppressing salt expansion and significantly improving the soil's strength.
英文关键词	Saline soil Fly ash Aeolian sand Freeze-thaw cycles Strength characteristics Microscopic evolution
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:001267285000001
WOS类目	Construction & Building Technology ; Engineering, Civil ; Materials Science, Multidisciplinary
WOS研究方向	Construction & Building Technology ; Engineering ; Materials Science
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/403111
推荐引用方式 GB/T 7714	Chen, Yuanqing,maimait, Akelamjiang.,Cheng, Jianjun,et al. Properties of saline soil stabilized with fly ash and modified aeolian sand[J],2024,21.
APA	Chen, Yuanqing.,maimait, Akelamjiang..,Cheng, Jianjun.,Duan, Yanfu.,Yin, Dawei.,...&Li, Yupeng.(2024).Properties of saline soil stabilized with fly ash and modified aeolian sand.CASE STUDIES IN CONSTRUCTION MATERIALS,21.
MLA	Chen, Yuanqing,et al."Properties of saline soil stabilized with fly ash and modified aeolian sand".CASE STUDIES IN CONSTRUCTION MATERIALS 21(2024).