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Experimental Study of Environmental Remediation of Gulf Coast Crude-Oil-Contaminated Soil Using Low-Temperature Thermal Treatment
... The use of temperature is beneficial in the remediation of polluted soils. Many studies in the field of heat remediation of soils contaminated with crude oil, heavy metals, and radioactive substances have been conducted (Alcocer and Chowdhury, 1993;Varlakov et al., 1996). Because heat loss has a significant effect on changes in the microstructure of clay, thermal conductivity is considered as an important criterion for energy conservation (Han et al., 2017). ...
... Many scholars have studied soil remediation contaminated by crude oil, heavy metals, and radioactive material [16,17]. Recent studies have primarily focused on the burial of high-level radioactive waste and the result of heat on the properties and function of the surrounding soil [18,19]. ...
Clay soil may be subjected to heat in various applications, such as nuclear waste burial sites and high voltage transmission lines. The impact of heat on clay soil's physical and mechanical properties has been explored in previous studies. However, previous studies have mainly focused on the mechanical properties of clay soil without stabilizers, and the effect of heat on the properties of the stabilized clay soil is scarcely studied. The present paper has analyzed and studied the combined effects of heat and cement on the settlement properties of kaolinite clay soil. To conduct the study, kaolinite clay mixed with various degrees of cement was exposed to a range of 25 to 600 degrees Celcius. The results showed that the coefficient of consolidation gradually decreased by increasing heat up to the dehydroxylation point. An increase in heat up to 200 degrees Celcius resulted in increasing the coefficient of consolidation in the specimens containing cement. In specimens containing 10 percent of the cement at temperatures higher than 200 degrees Celcius, the coefficient of consolidation in room temperature decreased by 73 percent compared to kaolinite. Moreover, the void ratio increased in kaolinite specimens without cement when subjected to heat up to 400 degrees Celcius. By increasing the heat, the void ratio decreased in specimens containing 10 percent cement. © 2022 Materials and Energy Research Center. All rights reserved.
... Mitchell [1] indicated that the heat treatment changed some physical and mechanical properties of the clayey soils such as the internal angle of friction, cohesion and strength. Alcocer and Chowdhury [2] applied heat treatment on clayey soils contaminated with crude oil. Joshi et al. [3] studied the effect of the heat treatment on the durability or strength and physical properties of the clays at the temperatures ranging from 300 to 700 jC. ...
This study examines the effects of heat treatment under laboratory conditions for two types of clay collected
... Many scholars have studied soil remediation contaminated by crude oil, heavy metals, and radioactive material [16,17]. Recent studies have primarily focused on the burial of high-level radioactive waste and the result of heat on the properties and function of the surrounding soil [18,19]. ...
Please cite this article as: M. Hashemi, S. M. Marandi, M. Vahidi, The effect of heat on the settlement properties of cement-stabilized clay soil A B S T R A C T Clay soil may be subjected to heat in various applications, such as nuclear waste burial sites and high voltage transmission lines. The impact of heat on clay soil's physical and mechanical properties has been explored in previous studies. However, previous studies have mainly focused on the mechanical properties of clay soil without stabilizers, and the effect of heat on the properties of the stabilized clay soil is scarcely studied. The present paper has analyzed and studied the combined effects of heat and cement on the settlement properties of kaolinite clay soil. To conduct the study, kaolinite clay mixed with various degrees of cement was exposed to a range of 25 to 600 degrees Celcius. The results showed that the coefficient of consolidation gradually decreased by increasing heat up to the dehydroxylation point. An increase in heat up to 200 degrees Celcius resulted in increasing the coefficient of consolidation in the specimens containing cement. In specimens containing 10 percent of the cement at temperatures higher than 200 degrees Celcius, the coefficient of consolidation in room temperature decreased by 73 percent compared to kaolinite. Moreover, the void ratio increased in kaolinite specimens without cement when subjected to heat up to 400 degrees Celcius. By increasing the heat, the void ratio decreased in specimens containing 10 percent cement.
... When the clayey soils are treated with heat, some of the changes in properties are permanent. The huge fires in the forests across the world have brought the thought to measure the effect of heat on clayey soils (Alcocer, C. and H. Chowdhury, 1993). ...
With an intention to investigate the influence of heat on the soil particles when they get exposed to thermal flux, six soils of entirely different characteristics were subjected to temperatures up to 300 C (this being the maximum temperature associated with the nuclear wastes to be disposed in geoenvironment), in steps of 50 C. After each step of thermal treatment, the residues were characterized for their crystal size, lattice strain, normal stress (tensile and compressive), and shear stress, by X-ray diffraction (XRD) analysis. Based on a critical synthesis of the results, it has been demonstrated that the stresses on the soil particles change from tensile to compressive while the strains are insignificant. It is believed that such a study would be quite useful in predicting the response and engineering properties of soils at elevated temperatures.
This study examines the effect of temperature under laboratory conditions of three clayey soils collected from northern Jordan. Soils were subjected to four temperature levels, i.e. 100, 200, 300 and 400 °C. Various soil properties were studied including Atterberg limits, particle size distribution, optimum water content, maximum dry density, swelling potential, and unconfined compressive strength. Experimental results revealed that heat treatment higher than 100 °C resulted in a decrease in liquid and plastic limits, optimum water content, unconfined compressive strength, and swelling pressure of soils tested. However, maximum dry density increased slightly with an increase in temperature to reach a maximum value of 14.3 kN/m3 at 400 °C for soil-1 compared to 12.9 kN/m3 at ambient temperature. Heating the clayey soils at 400 °C decreased the liquid limit, plastic limit, optimum water content, swelling pressure, and unconfined compressive strength by 80%, 100%, 65%, 94%, and 100%, respectively, in average compared to soil specimens at ambient temperature.
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