Effect of CO2-Induced Magnesium Carbonate on Improving the Behavior of Genaveh Clay

Document Type : Original Article

Authors

1 Department of Civil Engineering, Buin Zahra Technical and Engineering University, Qazvin, Iran.

2 Assistant Professor, Department of Civil Engineering, Buin Zahra Technical and Engineering University, Qazvin, Iran.

Abstract

In this study, the effect of CO2-induced magnesium carbonate on the plasticity index, consolidation behavior and shear strength of natural soft clay was investigated. Magnesium carbonate was produced by absorbing carbon dioxide gas and used as a powder for clay treatment. Different tests including atterberg limits, consolidation, unconfined compression, and triaxial compression tests were conducted on the treated and untreated samples. The triaxial tests were conducted in consolidated undrained (CU) condition. Also, SEM images and XRD analyses were prepared on produced magnesium carbonate and treated and untreated clay samples. The obtained results show that the plasticity index of the treated clay decreased and consolidation behavior was improved as the magnesium carbonate content increased. Regarding the SEM images the magnesium carbonate particles are needle-shaped and cause stronger structure and granular behavior in clay soils. According to the triaxial test results, with increasing confining stress, the shear strength of the treated samples increases compared to untreated clay. The internal friction angle of Genaveh soft clay in both undrained and drained conditions increases significantly, by adding 15 percent magnesium carbonate to the soil.

Keywords

Main Subjects

References

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