Effect of freeze-thaw cycles on mechanical behavior of clay-gravel mixtures

Zhang, Yong-gan; Liu, Si-hong; Deng, Gang; Fang, Bin-xin; Zhang, Yan-yi; Lu, Yang

doi:10.1007/s11629-022-7317-6

Cited by 7 publications

(2 citation statements)

References 42 publications

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“…Considering the difference between stress-strain curves, for strainsoftening curves, the maximum point is the peak deviation stress. For strain-hardening curves, the deviation stress at a 20% strain is taken as the peak deviation stress [42]. Figure 8 shows the peak deviation stress of the MWCNT-modified clay specimens under various confining pressures.…”

Section: Variation In Mechanical Propertiesmentioning

confidence: 99%

Evaluating the Potential of Multi-Walled Carbon Nanotube-Modified Clay as a Landfill Liner Material

Liu,

Chen,

2023

Materials

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In this paper, the feasibility of multi-walled carbon nanotube (MWCNT)-modified clay as a landfill liner material is investigated. Experiments were conducted on the modified clay with 0.5%, 1%, and 2% MWCNTs. The effects of the MWCNTs on the compaction characteristics, permeability coefficient, stress–strain curve, peak deviation stress, shear strength parameters (internal friction angle and cohesion), microstructures, and adsorption performance of the clay were analyzed. The results showed that the optimum moisture content (OMC) increased from 16.15% to 18.89%, and the maximum dry density (MDD) decreased from 1.79 g/cm3 to 1.72 g/cm3 with the increase in MWCNTs. The permeability coefficients firstly fell and then gradually rose as the MWCNTs increased; the minimum permeability coefficient was 8.62 × 10−9 cm/s. The MWCNTs can also effectively increase the peak deviation stress of the clay, and at the maximum level, the peak deviation stress was increased by 286%. SEM images were processed using the Pore and Crack Analysis System (PCAS), and the results showed that the appropriate amount of MWCNTs could fill the pores and strengthen the clay structure. The effect of the MWCNT-modified clay on the adsorption performance of common heavy metal ions Cd2+, Mn2+ and Cu2+ in landfill leachate was analyzed by batch adsorption tests. The maximum adsorption capacities (Qmax) of Cu2+, Cd2+ and Mn2+ in the 2% MWCNT-modified clay were, respectively, 41.67 mg/g, 18.69 mg/g, and 4.97 mg/g. Compared with the clay samples without MWCNTs, the adsorption properties of Cu2+, Cd2+, and Mn2+ were increased by 228%, 124%, and 202%, respectively. Overall, the results suggest that MWCNT-modified clays have the potential to be suitable barrier materials for the construction of landfills.

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Section: Variation In Mechanical Propertiesmentioning

confidence: 99%

Evaluating the Potential of Multi-Walled Carbon Nanotube-Modified Clay as a Landfill Liner Material

Liu,

Chen,

2023

Materials

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“…In summary, mixing rubber with soil under certain conditions can change soil properties and enhance its value for engineering applications. However, approximately 23% of all land on Earth is covered with permafrost or seasonally frozen soil, where freeze-thaw cycling in seasonally frozen soil significantly affects the behavior of the soil and decreases its shear strength [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Influence of Mixing Rubber Fibers on the Mechanical Properties of Expansive Clay under Freeze–Thaw Cycles

Yang,

Sun,

Ling

et al. 2024

Applied Sciences

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With the growth of the transportation industry, large volumes of waste tires are being generated, which necessitates the development of effective solutions for recycling waste tires. In this study, expansive clay was mixed with rubber fibers obtained from waste tires. Triaxial tests were conducted on the rubber fiber-reinforced expansive clay after freeze–thaw cycles. The experimental results of the unreinforced expansive clay from previous studies were used to evaluate the effect of mixing rubber fibers on the mechanical properties of rubber fiber-reinforced expansive clay under freeze–thaw cycles. The results demonstrate that the mixing of rubber fibers significantly reduces the effect of freeze–thaw cycles on the shear strength and elastic modulus of expansive clay. The shear strength and elastic modulus of the unreinforced expansive clay decrease markedly as the number of freeze–thaw cycles increases, while the shear strength and elastic modulus of the rubber fiber-reinforced expansive clay do not exhibit any remarkable change. A calculation model of the deviatoric stress–axial strain curves after freeze–thaw cycles was established. The model describes the deviatoric stress–axial strain behavior of rubber fiber-reinforced expansive clay and unreinforced expansive clay under different confining pressures and different numbers of freeze–thaw cycles.

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Surrounding rock pressure in the tunnel portal section through moraine under freeze-thaw action

Chen,

Liu,

Liu

et al. 2024

J. Mt. Sci.

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Effect of freeze-thaw cycles on mechanical behavior of clay-gravel mixtures

Cited by 7 publications

References 42 publications

Evaluating the Potential of Multi-Walled Carbon Nanotube-Modified Clay as a Landfill Liner Material

Evaluating the Potential of Multi-Walled Carbon Nanotube-Modified Clay as a Landfill Liner Material

Influence of Mixing Rubber Fibers on the Mechanical Properties of Expansive Clay under Freeze–Thaw Cycles

Surrounding rock pressure in the tunnel portal section through moraine under freeze-thaw action

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