دانلود رایگان مقاله اثر نانوصفحات اکسید گرافن بر خواص ژئوتکنیکی خاک سیلت سیمانی

ABSTRACT

In the present study, the effect of graphene oxide nanosheets (GO) on the geotechnical properties of cemented soil was investigated. Various concentrations of GO (0.02, 0.05 and 0.1 wt% of cement) were added to the soil to evaluate the influence of GO on the soil's compaction characteristics, consistency limits, unconfined compression strength (UCS) and direct shear parameters. The scanning electron microscopy (SEM) and X-ray powder diffraction (XRD) analysis were used to characterize the structure of synthesized GO and stabilized soil samples. The addition of GO decreased the plasticity and compressibility parameters of the treated soil samples. The tensile and the shear strength of the treated soil samples were increased with an increase in the GO concentration. The unconfined compressive strength was increased as the GO content increased in the cemented soil samples. The obtained results showed that the GO as a stabilizing agent has a considerable influence on the mechanical properties of stabilized soil.

4. Conclusion

The cementitious composites treated with graphene oxide nanosheets were successfully developed and were added to the Iranian soft soil samples to improve their geotechnical properties. The synthesized GO with the film thickness of 20– 30 nm was produced. The SEM results of soil/cement and soil/ cement/GO 0.05% indicated that the incorporation of GO into the cemented-soil resulted in decreasing the pores of soil matrix. The enhancement in GO content led to increase in dry density and decrease in optimum moisture content of treated soil samples. The results of Atterberg limits test (including LL, PL, PI) indicated that the LL, PL and PI of the cemented soil samples were decreased with increasing GO content. The inclusion of GO nanosheets within cemented soil caused an increase in the UCS and shear strength parameters (cohesion and internal friction angle). The enhancement in the interconnection between clay particles with higher GO content led to exhibit a more stiff behavior of treated soils. The obtained results revealed that the addition of cement/ GO to soil can be considered as an efficient method to improve the mechanical properties of cemented soft soil samples.