Potential reuse of oil-contaminated soils guidance policies are demonstrating ways to reuse these materials in engineering applications. However, the engineering properties of these materials are highly altered after contamination. Alternatively, chemical stabilization treatments can improve oil-contaminated soil properties for its reuse in geotechnical applications. This study investigates the effect of a diesel contamination on a coarse-grained soil and assesses the viability of a lime treatment. Laboratory tests included pH, Atterberg limits, compaction, unconfined compression strength (UCS), California Bearing Ratio (CBR) and tensile strength, RX-diffraction and scanning electron micrographs before and after lime treatment. Tests were performed on natural soil, diesel-contaminated soils (2, 4, 8, 12, and 16% of diesel) and lime treated diesel-contaminated soils (2, 4, 6 and 8% of lime). Diesel drastically changed soil plasticity and strength properties. Lime stabilization of diesel-contaminated soils was efficient to recapture soil natural properties with low lime contents. The influence of oil and lime in soil mechanical properties and mineralogical characteristics was evidenced in this study. The presence of oil drastically altered soil mechanical properties. Crystallization of calcite was present in both natural and oil-contaminated soils treated with lime, increasing particles flocculation. The presence of oil favored dolomite formation. Lime was significate in enhancing oil-contaminated soil mechanical properties, such as UCS, indirect tensile strength and CBR, mainly due to carbonation reactions. Oil-contaminated soil mixtures showed increase in mechanical properties after lime treatment and curing period.

中文翻译：

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石灰处理的被柴油污染的粗粒土壤可在岩土工程中重复使用

潜在的被油污土壤再利用的指导政策正在说明在工程应用中再利用这些材料的方法。但是，这些材料的工程性质在污染后会发生很大变化。另外，化学稳定化处理可以改善被石油污染的土壤的特性，使其在岩土工程应用中重复使用。这项研究调查了柴油污染对粗粮土壤的影响，并评估了石灰处理的可行性。实验室测试包括石灰处理前后的pH值，Atterberg限值，压实度，无侧限抗压强度（UCS），加利福尼亚承重比（CBR）和拉伸强度，RX衍射和扫描电子显微照片。在天然土壤，柴油污染的土壤（2、4、8、12，和16％的柴油）和经石灰处理的被柴油污染的土壤（分别为2、4、6和8％的石灰）。柴油极大地改变了土壤的可塑性和强度特性。柴油污染土壤的石灰稳定可以有效地恢复低石灰含量的土壤自然特性。这项研究证明了油和石灰对土壤力学性能和矿物学特征的影响。油的存在极大地改变了土壤的机械性能。在用石灰处理的天然和油污染土壤中均存在方解石的结晶，从而增加了颗粒的絮凝。油的存在有利于白云石的形成。主要由于碳化反应，石灰在增强受油污染的土壤机械性能（例如UCS，间接拉伸强度和CBR）方面具有重要意义。