Investigation of Freeze‐Thaw Resistance of Stabilized Saline Soil

Zhou, Yue; Guan, Qingfeng; Yan, Peiyu

doi:10.1155/2021/5555436

Cited by 2 publications

(3 citation statements)

References 45 publications

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“…It can be inferred that as the sample naturally dried, the Ca(OH) 2 formed by lime hydrolysis in the soil sample underwent a transformation from a colloidal to a crystalline state during the process of dry hardening. At the same time, Ca(OH) 2 carbonized with CO 2 in the air to form CaCO 3 [47], and the formation process was as follows Equations ( 9) and (10). As the sample is naturally A-D, the water glass is carbonized with CO 2 in the air to form a silicate gel.…”

Section: Microstructure Analysismentioning

confidence: 99%

“…Zhu et al [9] proposed a new water-based polymer that can improve the strength, water stability, and dry-wet cycle resistance of saline soil. After studying the freeze-thaw (FT) resistance of stable sulfate saline soil, Zhou et al [10] proposed that a high proportion of stabilizers can improve the FT resistance of stable soil. Zhang et al [11] employed polypropylene fiber to reinforce red clay and investigate its strength and failure characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Experiment and Improvement Mechanism Analysis on the Mechanical Properties of Improved Chlorine Saline Soil

Maimaitiyusupu,

Zhao,

Tao

2023

Advances in Civil Engineering

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Chlorine saline soil has adverse engineering geology such as dissolution, collapse, and pulping, the recycling of saline soil in subgrade treatment is of great research significance. First, the unconfined compressive strength (UCS) test was conducted using an orthogonal test design, and the optimal ratios of salt content, cement content, lime content, fiber content, and fiber length were determined. Second, the cyclic loading (CL) test was conducted using an orthogonal test design, and the influence of five factors, including freeze–thaw (FT) times, CL times, stress level (SL), amplitude, and frequency, on peak intensity, peak strain, and cumulative strain under FT cycles and natural air-drying (A-D) conditions were determined. Finally, the improvement mechanism of the above inorganic materials was microscopically analyzed by scanning electron microscope-energy dispersive spectrometer and X-ray diffraction tests. The UCS test results show that the improving effect of the optimal ratio for chlorine saline soil was best when the optimal ratio values were 3% (salt content), 8% (cement content), 12% (lime content), 0.2% (fiber content), and 18 mm (fiber length). CL test results show that with the increase in natural A-D time, it was found that the FT number and SL have significant effects on the strength, the number of FT times and cycle times have significant effects on the deformation, and the frequency and cycle times have significant effects on the cumulative deformation. From the microstructure analysis, the improvement mechanism is mainly the filling of pores and linking particles by water-hard gels and gas rigid gels to make the microstructure dense, effectively reduce pores, and effectively improve the engineering characteristics of chlorine saline soil. The results of this study provide a scientific basis for the engineering design of subgrade in arid areas and the in situ recycling of saline soil.

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Section: Microstructure Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experiment and Improvement Mechanism Analysis on the Mechanical Properties of Improved Chlorine Saline Soil

Maimaitiyusupu,

Zhao,

Tao

2023

Advances in Civil Engineering

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“…This could cause the volume to increase by more than 200%, resulting in salt heaving in the soil. In terms of chlorine saline soil, many researchers [23][24][25][26] measured the strength of the treated and untreated saline soil under short-term freeze-thaw cycles, and found that the treated saline soil gradually decreased, but the strength of untreated saline soil first increased and then decreased.…”

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confidence: 99%

Changing of mechanical property and bearing capacity of strongly chlorine saline soil under freeze-thaw cycles

Ding,

Li,

Kong

et al. 2024

Sci Rep

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Freeze-thaw cycles and compactness are two critical factors that significantly affect the engineering properties and safety of building foundations, especially in seasonally frozen regions. This paper investigated the effects of freeze-thaw cycles on the shear strength of naturally strongly chlorine saline soil with the compactness of 85%, 90% and 95%. Three soil samples with different compactness were made. Size and mass changes were measured and recorded during freeze-thaw cycles. Shear strength under different vertical pressures was determined by direct shear tests, and the cohesion and friction angle were measured and discussed. Microstructure characteristic changes of saline soil samples were observed using scanning electron microscopy under different freeze-thaw cycles. Furthermore, numerical software was used to calculate the subsoil-bearing capacity and settlement of the electric tower foundation in the Qarhan Salt Lake region under different freeze-thaw cycles. Results show that the low-density soil shows thaw settlement deformation, but the high-density soil shows frost-heaving deformation with the increase in freeze-thaw cycles. The shear strength of the soil samples first increases and then decreases with the increase in freeze-thaw cycles. After 30 freeze-thaw cycles, the friction angle of soil samples is 28.3%, 29.2% and 29.6% lower than the soil samples without freeze-thaw cycle, the cohesion of soil samples is 71.4%, 60.1% and 54.4% lower than the samples without freeze-thaw cycle, and the cohesion and friction angle of soil samples with different compactness are close to each other. Microstructural changes indicate that the freeze-thaw cycle leads to the breakage of coarse particles and the aggregation of fine particles. Correspondingly, the structure type of soil changes from a granular stacked structure to a cemented-aggregated system. Besides, the quality loss of soil samples is at about 2% during the freeze-thaw cycles. Results suggest that there may be an optimal compactness between 90 and 95%, on the premise of meeting the design requirements and economic benefits. This study can provide theoretical guidance for foundation engineering constructions in seasonally frozen regions.

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Investigation of Freeze‐Thaw Resistance of Stabilized Saline Soil

Cited by 2 publications

References 45 publications

Experiment and Improvement Mechanism Analysis on the Mechanical Properties of Improved Chlorine Saline Soil

Experiment and Improvement Mechanism Analysis on the Mechanical Properties of Improved Chlorine Saline Soil

Changing of mechanical property and bearing capacity of strongly chlorine saline soil under freeze-thaw cycles

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