Passive Remediation with Colloidal Silica Effect on Shear Strength Properties of oil-contaminated Bushehr Carbonate Sand

Document Type : Research Article

Authors

1 Master of science, Imam Khomeini International University, Engineering Faculty, Iran

2 Faculty of Engineering and Technology, Imam khomeini international university, Qazvin, Iran

3 Islamic Azad University, Masal, Iran.

Abstract

Crude oil is one of the soil and water pollution sources that change the geotechnical properties of the soil via both physical and chemical processes. Carbonate sand which is found in oil-rich and continental regions is exposed to oil pollution so that studying the effect of oil and petroleum product contamination is unavoidable. On the other hand, injecting a colloidal silica solution, stabilization and improvement of oil-contaminated sand has been investigated broadly. In this research, several triaxial undrained-unconsolidated tests were conducted to investigate the shear strength of carbonate sand contaminated with crude oil as well as contaminated sand stabilized by colloidal silica injection. The results showed that oil pollution reduced the maximum shear strength and the friction angle of carbonate sand, as well as a significant decrease in elasticity modulus while oil content increased. In injected specimens, colloidal silica increases the shear strength, cohesion, and stiffness significantly relative to the oil-contaminated ones.

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References

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Amirkabir Journal of Civil Engineering
Volume 53, Issue 1
April 2021
Pages 367-382

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