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Volume 18
Issue 17
10.3390/ma18173982
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Strength and Microstructural Evolution of SRX-Stabilized Aeolian Sand–Gravel Flexible Base for Desert Road Construction

by
Jie Liu
1,2,3,
Qinli Liu
2,4,*,
Chao Pu
1,2,
Bo Wu
1,2,
Xin Wang
1,2 and
Shiyu Zhu
5,*
1
Xinjiang Transportation Planning, Survey and Design Institute Co., Ltd., Urumqi 830006, China
2
Xinjiang Key Laboratory for Safety and Health of Transportation Infrastructure in Alpine and High-Altitude Mountainous Areas, Urumqi 830006, China
3
Key Laboratory of Transport Industry of Highway Engineering Technology in Arid Desert Areas, Urumqi 830006, China
4
China State Construction Bridge Co., Ltd., Chongqing 402260, China
5
College of Civil Engineering, Anhui Jianzhu University, Hefei 230009, China
*
Authors to whom correspondence should be addressed.
Materials 2025, 18(17), 3982; https://doi.org/10.3390/ma18173982 (registering DOI)
Submission received: 4 July 2025 / Revised: 6 August 2025 / Accepted: 14 August 2025 / Published: 25 August 2025
(This article belongs to the Special Issue Sustainable and Eco-Friendly Concrete: Innovations in Green Binders and Recycled Materials)
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Abstract

This study investigates the strength and microstructural evolution of SRX-stabilized aeolian sand–gravel mixtures for flexible base applications in desert roads. CBR, UPS (uniaxial penetration strength), and compressive resilient modulus tests were conducted under varying SRX dosages (0.4–1.0%) and aeolian sand contents (30–50%). The results show that increasing the SRX dosage significantly improves all three indices, with the 0.5% SRX and 30% aeolian sand mixture yielding the CBR (385.89%) and UPS (0.938 MPa) and achieving a compressive resilient modulus that meets the requirements for graded aggregate base layers. XRD FTIR and SEM–EDS analyses reveal that the SRX enhances material structure primarily through physical mechanisms, forming dense films and bonding networks without inducing significant chemical reactions. Extended curing improves structural integrity, while excessive aeolian sand reduces compactness. SRX-stabilized aeolian sand gravel is a viable base and subbase material for desert highways.
Keywords: flexible base; SRX; aeolian sand; mechanical properties; microscopic analysis flexible base; SRX; aeolian sand; mechanical properties; microscopic analysis
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MDPI and ACS Style

Liu, J.; Liu, Q.; Pu, C.; Wu, B.; Wang, X.; Zhu, S. Strength and Microstructural Evolution of SRX-Stabilized Aeolian Sand–Gravel Flexible Base for Desert Road Construction. Materials 2025, 18, 3982. https://doi.org/10.3390/ma18173982

AMA Style

Liu J, Liu Q, Pu C, Wu B, Wang X, Zhu S. Strength and Microstructural Evolution of SRX-Stabilized Aeolian Sand–Gravel Flexible Base for Desert Road Construction. Materials. 2025; 18(17):3982. https://doi.org/10.3390/ma18173982

Chicago/Turabian Style

Liu, Jie, Qinli Liu, Chao Pu, Bo Wu, Xin Wang, and Shiyu Zhu. 2025. "Strength and Microstructural Evolution of SRX-Stabilized Aeolian Sand–Gravel Flexible Base for Desert Road Construction" Materials 18, no. 17: 3982. https://doi.org/10.3390/ma18173982

APA Style

Liu, J., Liu, Q., Pu, C., Wu, B., Wang, X., & Zhu, S. (2025). Strength and Microstructural Evolution of SRX-Stabilized Aeolian Sand–Gravel Flexible Base for Desert Road Construction. Materials, 18(17), 3982. https://doi.org/10.3390/ma18173982

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