Experimental Investigation on Geotechnical Behavior of Collapsible Soils Improved with Nanomaterials

Document Type : Research Article

Authors

1 departement of Civil Engineering, Roodhen Branch, Islamic Azad University, Roodhen , Iran

2 Department of Civil Engineering, Estahban Branch, Islamic Azad University,

3 Dept of civil engineering, Faculty of engineering, Bahonar University , bahonar ,Iran

Abstract

Collapsibility is the sudden change of the soil volume due to the loss of the bonding forces of soil particles. The collapsibility in sands is caused by the sliding of the saturated clay that sticks the sand particles, while the collapse phenomena of the clay are caused by the loss of the electrochemical bond that has formed on the outer surface of the clay plates. Considering that the phenomenon of subsidence has caused many problems in buildings and structures, it is very important to pay attention to the behavior of this type of soil and its improvement. In this research, the effect of nanomaterials on the collapsibility potential of soils has been investigated. The volume change behavior, the collapsibility potential, and the shear strength improved under the effect of Nano-silica, Nano-clay, Aluminum Nano-oxide and Calcium Nano-carbonate have been considered.  The results showed that the soil collapsibility index with the addition of Nano-silica and Nano-clay has a significant reduction in the collapse potential, but the Calcium Nano-carbonate and Aluminum Nano-oxide, have less effect on collapsibility reduction. Furthermore, the Nano-silica and Nano-clay increase the adhesion coefficient, while Nano-calcium Carbonate and Nano-silica have the greatest effect on the internal friction angle of the soil. Also, the scanning electron microscope (SEM) photography showed that the soil has microscopic pores and becomes less with the addition of nanomaterials. The soil pores and the soil texture become denser, and as a result, it reduces the collapse potential.

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References

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Amirkabir Journal of Civil Engineering
Volume 55, Issue 10
January 2024
Pages 2091-2112

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