Nasiri Hadis, Khayat Navid, Nazarpour Ahad
Department of Civil Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.
Department of Geology, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.
Heliyon. 2025 Jan 8;11(2):e41764. doi: 10.1016/j.heliyon.2025.e41764. eCollection 2025 Jan 30.
In oil-rich regions, the increasing risk of oil spills on soil is largely attributed to intensified extraction and transportation activities. This situation necessitates a focus on the short-term and long-term strength of contaminated soils. While existing literature primarily evaluates the oil-contaminated soils over short-term periods, typically up to 28 days, it is essential to investigate their long-term performance, extending the evaluation period to 365 days. This study addresses the critical gap in understanding the long-term performance of soils contaminated with 4 %, 7 %, and 10 % oil by evaluating the effectiveness of lime stabilization over a one-year period. Laboratory tests were conducted on soils treated with varying lime contents (0 %, 3 %, 6 %, and 9 %) and cured for 1, 14, 28, and 365 days. Key performance indicators, including unconfined compressive strength (UCS), California Bearing Ratio (CBR), and durability under wet-dry cycles, were measured. The results demonstrate that a 6 % lime content significantly improves long-term UCS, with strength gains ranging from 16.6 % to 24.5 % while enhancing resilience to wet-dry cycles. Microstructural analyses confirmed the formation of calcium-aluminum-silicate-hydrate (C-A-S-H) phases, contributing to the observed strength and durability improvements. This research underscores the potential of lime stabilization as a sustainable solution for managing oil-contaminated soils, reducing reliance on raw materials, and promoting more sustainable infrastructure development.
在石油资源丰富的地区，土壤发生溢油的风险不断增加，这在很大程度上归因于开采和运输活动的加剧。这种情况使得有必要关注受污染土壤的短期和长期强度。虽然现有文献主要在短期内（通常最长28天）评估受油污染的土壤，但研究其长期性能，将评估期延长至365天至关重要。本研究通过评估为期一年的石灰稳定化效果，填补了在了解受4%、7%和10%油污土壤长期性能方面的关键空白。对用不同石灰含量（0%、3%、6%和9%）处理并养护1天、14天、28天和365天的土壤进行了实验室测试。测量了包括无侧限抗压强度（UCS）、加州承载比（CBR）以及干湿循环下的耐久性等关键性能指标。结果表明，6%的石灰含量显著提高了长期无侧限抗压强度，强度增幅在16.6%至24.5%之间，同时增强了对干湿循环的抵抗力。微观结构分析证实了钙铝硅酸盐水合物（C-A-S-H）相的形成，这有助于观察到的强度和耐久性的提高。本研究强调了石灰稳定化作为一种可持续解决方案在管理受油污染土壤、减少对原材料的依赖以及促进更可持续的基础设施发展方面的潜力。
