Mechanical properties of a clay soil reinforced with rice husk under drained and undrained conditions

Baldin, Claudia Regina Bernardi; Kawanami, Maiky Yamato; Costa, Weiner Gustavo Silva; Bordignon, Vitor Reinaldo; Luz, Cristhyano Cavali da; Izzo, Ronaldo Luis dos Santos

doi:10.1016/j.jrmge.2023.02.022

Cited by 5 publications

(1 citation statement)

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“…With the increased content of MWCNTs, the lubricating effect of the MWCNTs was stronger than the cementing effect, resulting in the reduction of the peak deviation stress. In order to additionally examine the impact of the MWCNTs on the shear strength parameters of clay specimens, the internal friction angle and cohesion of various MWCNTmodified clays were calculated using the Mohr-Coulomb theory [43], as shown in Figure 9. The cohesion of the specimens modified with different MWCNT contents are 24.5 kPa, 156.2 kPa, 165 kPa, and 125.5 kPa, respectively.…”

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%