Experimental Investigation and Analysis of the Shear Properties of GO Cement Soil under Chloride Erosion and Wetting–Drying Cycles

DOI: https://doi.org/10.62517/jcte.202606403

Author(s)

Jingshuang Zhang1,2, Jingxiang Xin1,2,*, Yulong Que1

Affiliation(s)

1School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan, Anhui, China 2State Key Laboratory for Safe Mining of Deep Coal Resources and Environment Protection, Anhui University of Science and Technology, Huainan, Anhui, China *Corresponding Author

Abstract

The effects of chloride erosion and wetting–drying cycles on the shear properties of graphene oxide (GO) cement soil were investigated through direct shear testing. Specimens with different GO dosages were first tested, followed by further direct shear tests at various NaCl concentrations and wetting–drying cycle counts. SEM was also used to examine the microstructure. The results show that the shear strength, cohesion and internal friction angle of cement soil initially increased with GO dosage but declined at higher dosages. The optimal GO dosage was 0.06% by mass of cement. For cement soil containing the optimal GO dosage, shear performance decreased with higher NaCl concentrations and more wetting–drying cycles. After 15 cycles in a 30 g/L NaCl solution, the shear strength retention ratio was 62.17%. SEM observations revealed a dense microstructure at the optimal GO dosage. Higher NaCl concentrations and more wetting–drying cycles promote the development of pores and microcracks in cement soil, leading to a decline in its macroscopic shear performance.

Keywords

Cement Soil; Graphene Oxide; Wetting–Drying Cycles; Chloride Erosion; Shear Strength; Microstructure

References

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