Experimental Study on Dynamic Properties of Nano-MgO-Modified Silty Clay

Abstract

To study the dynamic properties of nano-MgO-modified soil, the contents of nano-MgO which were 0%, 1%, 2%, 3%, 4% and 5% of the dry weight for soil were added into the soil. The water content of soil samples were 16% and 22%. The variation of shear modulus and damping ratio of soil was analyzed through the resonant-column test of the modified soil. The results show that with the increasing of shear strain, the shear modulus of soil decreases and the damping ratio of soil increases, the shear modulus for nano-MgO-modified soil reaches the maximum when the content of nano-MgO is 5%. The maximum shear modulus of soil with water content of 22% is smaller than that of soil with water content 16% under the same confining pressure, the shear modulus of soil increases linearly with the increasing of nano-MgO content. The reinforcement mechanism of the nano-MgO-modified soil was analyzed such as pore filling effect of nano-MgO, effect of water content, effect of vibration compaction, interaction between a nano-MgO group and a soil particle, interaction between several nano-MgO groups and soil particles.

Enhancement of the Acid Resistance of Silty Clay Using Nano-Magnesium Oxide

“…The study conducted by Taha et al [ 35 ] demonstrated that nano-MgO is significantly more effective than regular MgO at increasing the strength of soft soil. In addition, Gao et al [ 36 ] stated that nano-magnesium oxide is a unique and highly functional material with distinct chemical and physical characteristics compared to conventional magnesium oxide. In other research by Supin et al [ 37 ], changes in preparation temperature substantially affect the photocatalytic efficacy and the magnetic and optical properties of nano-MgO.…”

“…Recently, the utilization of nano-magnesium oxide as an additive to enhance the strength of clay soils has been increasingly documented in the literature [ 38 , 39 , 40 , 41 ]. Moreover, nano-MgO employment to improve the dynamic performance of soil was investigated [ 36 , 42 ].…”

Enhancement of Clay Compressibility and Strength Using Nano Magnesium Oxide

“…With the advancement of nanotechnology, nano-magnesium oxide is a high-function material. Compared to conventional magnesium oxide, it has a surface effect, an interface effect, a small size effect, and different chemical and physical properties, according to [14]. Gao [15] employed different percentages of nano Magnesium Oxide to investigate the clay soil reinforcing mechanism.…”

Special Issue on “Materials and Processes for Ground Engineering Infrastructure”

“…The topics of this special issue cover various aspects, including laboratory testing and evaluation of material properties, field monitoring of ground improvement practices, data processing techniques, theoretical and numerical modelling, and supporting technologies and methodologies in ground engineering infrastructure. This special issue contains several papers dealing with the usage of new materials ranging from fibres to powderbased materials (waste marble, eggshell, flyash, and biochar) and pre-fabricated drains from different perspectives (freeze-thaw, dry-wet resistance, dynamic shear, compressive and tensile loading as well as gas flow) [1][2][3][4][5][6][7][8][9][10][11][12]. Coir and hemp fibres along with fly ash based alkaline binders are found to have profound effect on geotechnical properties of soils, such as tensile strength under the condition of freeze-thaw cycles [1].…”

“…This could be related to tensile strength of fibre itself, which enhances mobilization of shear forces within amended soil specimens. Dynamic properties of soil are also found to improve with an addition of nano-MgO [6]. However, there is a need to further understand the use of chemicals on leaching effects under water infiltration.…”