Abstract
In this study, gasoil-contaminated clayey sand samples improved with clay nanoparticles in two hydrophilic and organophilic states were cured for 7, 14, and 28 days and were subjected to uniaxial compressive strength (UCS) tests. For this purpose, first, clean soil samples were contaminated with various percentages of gas–oil. The results showed that the unconfined compressive strength of the samples decreases with the increase in soil contamination percentage for all three curing periods. According to the results, the highest decrease of UCS is obtained in the soil with 6 and 8% contamination. Then, by adding different percentages of nanoclay and organoclay to soil contaminated with 6 and 8% gas–oil, we tried to improve the lost properties of the soil. According to results of standard compaction tests, combining contaminated with nanoclay and organoclay could decrease maximum dry density while increasing optimum water. But organoclay had a greater effect than nanoclay on the compaction properties of contaminated soil which can be attributed to the organophilic nature of the organoclay. Based on the results, the compressive strength of the treated samples was increased due to curing. Also, the peak strain corresponding to the UCS decreased during the 28-day curing period compared to the samples with a 7-day curing period. Based on the results, 2 and 0.7 weight percent of clayey sand contaminated with 6 and 8% of gas–oil were found as optimum values for nanoclay and organoclay, respectively. These results were investigated and confirmed by scanning electron microscopy imaging.
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Shahidi, M., Asemi, F. & Farrokhi, F. Improving the Mechanical Behavior of Soil Contaminated with Gas–Oil Using Organoclay and Nanoclay. Arab J Sci Eng 48, 4953–4969 (2023). https://doi.org/10.1007/s13369-022-07239-w
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DOI: https://doi.org/10.1007/s13369-022-07239-w