Mechanical property of geopolymer solidified aeolian sand under dry-wet-freeze-thaw cycle

doi:10.3785/j.issn.1008-973X.2025.11.015

Journal of ZheJiang University (Engineering Science)

2025, Vol. 59

Issue (11): 2361-2369 DOI: 10.3785/j.issn.1008-973X.2025.11.015

Mechanical property of geopolymer solidified aeolian sand under dry-wet-freeze-thaw cycle

Lingkai ZHANG1,2(

),Wei JIA1,2

1. College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi 830052, China
2. Xinjiang Key Laboratory of Water Conservancy Engineering Safety and Water Disaster Prevention, Urumqi 830052, China

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Abstract

Direct shear, compression, penetration and scanning electron microscopy (SEM) tests were conducted under dry-wet-freeze-thaw cycles in order to analyze the degradation law of mechanical property of geopolymer solidified aeolian sand under dry-wet-freeze-thaw cycles. The cohesion and internal friction angle show a decreasing trend of quadratic function with the increase of the number of cycles. The deterioration of shear strength parameter is characterized by an increase in the detachment area ratio and the pore area ratio. The compression index and the rebound index show a quadratic function trend with the increase of the number of cycles. The loss rate of compression characteristic parameter is highly correlated with the detachment area ratio and pore area ratio. The permeability coefficient shows an increasing trend with the increase of the number of cycles. The process can be divided into three stages: slow, rapid and stable. The increase of pore area ratio promotes the increase of permeability coefficient, and the increase of detachment area ratio slows down the increase of permeability coefficient.

Key words： dry-wet-freeze-thaw cycle solidified aeolian sand shear property compression characteristic permeability characteristic

Received: 05 November 2024 Published: 30 October 2025

CLC:

TU 441

Fund: 2022年自治区重点研发任务专项资助项目（2022B03024-3）；新疆维吾尔自治区杰出青年科学基金资助项目（2022D01E45）；新疆维吾尔自治区中央引导地方科技发展资金资助项目（ZYYD2024CG20）.

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Cite this article:

Lingkai ZHANG,Wei JIA. Mechanical property of geopolymer solidified aeolian sand under dry-wet-freeze-thaw cycle. Journal of ZheJiang University (Engineering Science), 2025, 59(11): 2361-2369.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2025.11.015 OR https://www.zjujournals.com/eng/Y2025/V59/I11/2361

干湿-冻融循环下地聚物固化风积沙力学特性

为了探讨干湿-冻融循环条件下地聚物固化风积沙的力学特性劣化规律，开展干湿-冻融循环条件下的直剪、压缩、渗透和扫描电镜(SEM)试验. 研究表明，随着循环次数的增加，黏聚力、内摩擦角均呈二次函数的减小趋势. 抗剪强度参数劣化在微观的表征为脱离体面积比与孔隙面积比的增加. 随着循环次数的增加，压缩指数、回弹指数均呈二次函数的变化趋势. 压缩特性参数的损失率与脱离体面积比、孔隙面积比的相关性较高. 随着循环次数的增加，渗透系数呈增加的趋势，过程可以分为缓慢、迅速、稳定3个阶段. 孔隙面积比的增加促进了渗透系数的增加趋势，脱离体面积比的增加减缓了渗透系数的增加趋势.

关键词： 干湿-冻融循环, 固化风积沙, 剪切特性, 压缩特性, 渗透特性

Fig.1 Aeolian sand, mineral powder, fly ash particle gradation curve

Fig.2 Distribution of main component of fly ash and slag powder

Fig.3 Shear characteristic curve of solidified aeolian sand under different cycle

Fig.4 Microscopic image of solidified aeolian sand under different cycle

Tab.1 Microscopic parameter of solidified aeolian sand under different cycle

Fig.5 Relationship between single microscopic parameter of solidified aeolian sand and loss rate of shear strength parameter under different cycle

Fig.6 Two-factor microscopic parameter of solidified aeolian sand and change surface of shear strength parameter loss rate under different cycle

Fig.7 Change curve of compression characteristic of solidified aeolian sand under different cycle

Fig.8 Microscopic image of solidified aeolian sand after compression test under different cycle

Tab.2 Microscopic parameter of solidified aeolian sand after compression test under different cycle

Fig.9 Relationship between single microscopic parameter of solidified aeolian sand and loss rate of compression characteristic parameter under different cycle

Fig.10 Change surface of microscopic parameter and compression characteristic parameter loss rate of solidified aeolian sand under different cycle

Fig.11 Variation curve of permeability characteristic of solidified aeolian sand under different cycle

Fig.12 Microscopic image of solidified aeolian sand after infiltration test under different cycle

Tab.3 Microscopic parameter of solidified aeolian sand after infiltration test under different cycle

Fig.13 Curve (surface) of microscopic parameter and permeability coefficient loss rate of solidified aeolian sand under different cycle


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