Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 53 1 2021 03 21 Passive Remediation with Colloidal Silica Effect on Shear Strength Properties of oil-contaminated Bushehr Carbonate Sand Passive Remediation with Colloidal Silica Effect on Shear Strength Properties of oil-contaminated Bushehr Carbonate Sand 367 382 2802 10.22060/ceej.2018.13268.5363 FA Ali Shakeri Master of science, Imam Khomeini International University, Engineering Faculty, Iran Reza Ziaie_Moayed Faculty of Engineering and Technology, Imam khomeini international university, Qazvin, Iran Mohammad Amin Nozari Islamic Azad University, Masal, Iran. Journal Article 2017 08 14 <strong>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.</strong> <strong>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.</strong> https://ceej.aut.ac.ir/article_2802_2eb5657d37f474e4c4cf01e4882b8962.pdf