Behavior of loessical silts contaminated with hydrocarbons and stabilized and solidified with Portland cement
DOI:
https://doi.org/10.21701/bolgeomin.121.2.001Keywords:
cement, geotechnique, hydrocarbon, loess, soilAbstract
Stabilization/Solidification (S/S) is one of the more accepted techniques for the remediation of contaminated soils. The expected behavior depends mainly on the contaminant type and concentration, stabilizing agent content and soil type. This work presents experimental results of the stabilization of a loessical silty soil contaminated with hydrocarbons. The S/S was performed by using Portland cement as stabilizing agent and by controlling the hydraulic conductivity and unconfined strength of the solidified mixtures. Obtained results show that the hydrocarbon produces an extremely high decrease of strength in this type of soils, with upper values close to the 20% of that registered in clean soil mixed with the same amount of cement. In coincidence with this trend, the hydraulic conductivity increases significantly due to the presence of organic contaminants since the cement–particle contact is restricted by the organic phase. Experimental results show that the hydraulic conductivity of the specimens containing encapsulated hydrocarbon increases one order of magnitude.
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