Mechanical and electrical properties of coarse-grained soil affected by cyclic freeze-thaw in high cold regions

Qu, Yonglong; Ni, Wei; Niu, Fujun; Mu, Yanhu; Chen, Guoliang; Luo, Jing

doi:10.1007/s11771-020-4336-8

Cited by 22 publications

(13 citation statements)

References 34 publications

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“…The common aeolian sand resource utilization improvement technology is the single-mixed cement modification method, Yong-long studied the factors affecting the unconfined compressive strength of cement-modified aeolian sand through laboratory experiments. It was found that the strength of the improved soil was positively correlated with the curing age, compaction coefficient, and cement strength grade [ 13 ]. Liu explored and found that, under the action of salt-freeze coupling, the unconfined compressive strength and pore volume of cement-modified aeolian sand showed a negative linear law, and the elastic modulus decreased with the increase of freeze-thaw times [ 14 ].…”

Section: Literature Reviewmentioning

confidence: 99%

Effect of Aeolian Sand Powder Addition on Frost Resistance of Concrete Pavement

Zhao

Deng

2022

International Journal of Analytical Chemistry

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In order to solve the problem of exploring the freeze-thaw characteristics of modified aeolian sand mixed with cement and silt, the authors propose a freeze-thaw cycle test of modified aeolian sand under the condition of mixing 5% cement and silt with different contents. In this experiment, under freeze-thaw conditions, its intensity decay and mass volume change law and the changes of freeze-thaw characteristics were comprehensively characterized by multiple indicators. The result shows that, after two freeze-thaw cycles, the compressive strength and peak strain of the improved aeolian sand were positively correlated with the silt content. With the increase of the number of freeze-thaw cycles, the compressive and antidestruction capacity of the improved aeolian sand with high silt content and low silt content decreased significantly. 15% silt content improves the structural stability of aeolian sand. It is proved that the authors’ experiment can intuitively and effectively reflect the change law of soil strength after freezing and thawing of such improved aeolian sandy soil, which has displayed significance.

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Section: Literature Reviewmentioning

confidence: 99%

Effect of Aeolian Sand Powder Addition on Frost Resistance of Concrete Pavement

Zhao

Deng

2022

International Journal of Analytical Chemistry

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“…According to previous work (Qu, Ni et al 2020), the samples were frozen at -20℃ for 12 h and thawed at 20℃ for 12 h. The freeze-thaw procedure was conducted in a closed system without water supply. The soil samples experienced different cycle numbers of 0, 5, 10, 15, and 20.…”

Section: Freeze-thaw Cycles Testmentioning

confidence: 99%

Experimental Research on Mechanical Properties and Microstructure Characteristics of Silty Clay Subgrade Filler With Red Pisha Sandstone and Carbide Slag in Seasonal Frozen Regions

Liu

Feng

2021

Preprint

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As the foundation structure of highway engineering, the quality of the subgrade determines the service life of highway engineering. Under this condition, the filling soils are frequently improved for raising the stability of the subgrade. Proper utilization of lower-cost waste materials will reduce demand for natural materials and the cost of construction. In this study, the red Pisha sandstone (RPS) and carbide slag (CS) as green and sustainable materials to reinforce the silty clay. The improvement effect was evaluated through freeze-thaw cycles test, triaxial compression strength test, particle-size distribution test, X-ray diffraction test, and scanning electron microscopy test. The results indicated that the addition of 15wt.% RPS and 15wt.% CS increased about 136% of the triaxial compressive strength of silty clay. With the increase of freeze-thaw cycles, the strength loss ratio and the deformation change slightly. It also has the excellent function of freezing and thawing resistance and shear strength. The key factors for the superior mechanical performance of RPS-CS stabilized silty clay are that more sand-size particles are beneficial to the hydration reactions of RPS and CS during the entire curing time, adequate flocculation and agglomeration of soil particles occurred. Many small-sized rounded and plate-like CSH gels filled most of the soils pores and isolated pores fractures became fewer in the samples, which produced a denser and less permeable material. The outcomes of this research will contribute to the utilization of red Pisha sandstone and carbide slag as a sustainable stabilizer in highway subgrade applications in seasonal frozen regions.

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“…PCAS software developed by Liu et al [16], which is a commercial software for analyzing the pore structure of soil in highresolution SEM images, was used to analyze the calcium carbonate-doped red clay samples. PCAS software has previously been used to analyze the fractures and pores of clay minerals [19,20]. e pore area and length analyzed by the PCAS software were calculated using pixels and converted to actual values by image resolution using equations (1) and (2):…”

Section: Quantitative Analysis Of Porementioning

confidence: 99%

Effect of Calcium Carbonate on the Mechanical Properties and Microstructure of Red Clay

Chen

Yang

et al. 2020

Advances in Materials Science and Engineering

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The influence of precipitated calcium carbonate on the strength and microstructure of red clay was studied. Precipitated calcium carbonate was added to red clay at ratios of 0%, 5%, 10%, 15%, and 20%. Shear tests were carried out on the samples to observe the effect of calcium carbonate on the mechanical properties of red clay. The results showed that, with increasing calcium carbonate content, the strength of red clay first decreased and then increased. The maximum strength was obtained for the sample with 20% calcium carbonate. Scanning electron microscopy (SEM) was used to observe the changes in microstructure caused by addition of calcium carbonate. The pores and cracks analysis system (PCAS) was used to quantitatively characterize the microstructure changes detected in SEM images. The addition of calcium carbonate decreased the pore area and increased the total number of pores of red clay. The incorporation of calcium carbonate caused the red clay particles to agglomerate. The higher the calcium carbonate content, the stronger the agglomeration of red clay particles in the soil samples.

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Mechanical and electrical properties of coarse-grained soil affected by cyclic freeze-thaw in high cold regions

Cited by 22 publications

References 34 publications

Effect of Aeolian Sand Powder Addition on Frost Resistance of Concrete Pavement

Effect of Aeolian Sand Powder Addition on Frost Resistance of Concrete Pavement

Experimental Research on Mechanical Properties and Microstructure Characteristics of Silty Clay Subgrade Filler With Red Pisha Sandstone and Carbide Slag in Seasonal Frozen Regions

Effect of Calcium Carbonate on the Mechanical Properties and Microstructure of Red Clay

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