مهندسی عمران فردوسی

مهندسی عمران فردوسی

مقایسه اثر افزودنی های آهک و GGBS فعال شده با منیزیم اکسید در بهسازی یک نوع خاک رسی آلوده به فنل

نوع مقاله : مقاله پژوهشی

نویسندگان
میثم گرشاسبی
علی رئیسی استبرق
جمال عبدالهی علی بیک
غلامعلی وکیلی
گروه مهندسی آبیاری و آبادانی، دانشگاه تهران.
10.22067/jfcei.2025.91416.1335
چکیده
در این کار تحقیقاتی، بهسازی یک خاک رسی طبیعی و آلوده شده به فنل با غلظت ppm ۲۰۰۰، توسط مواد افزودنی آهک و سرباره (GGBS) فعال شده به وسیله منیزیم اکسید (MgO) ، با انجام آزمایشات مورد بررسی قرار گرفت. روی نمونه هایی از خاک های طبیعی و آلوده اختلاط یافته با درصد های ۰ ، ۴ ، ۷ و ۱۰ از افزودنی های مذکور ، آزمایشات تعیین حدود اتربرگ و تراکم صورت پذیرفت و علاوه بر آن روی نمونه های تهیه شده آزمایش مقاومت تک محوری در زمان های عمل آوری ۷ ، ۱۴ و ۲۸ انجام گردید. نتایج نشان داد که که مواد افزودنی موجب تغییراتی در مقادیر حدود اتربرگ و پارامترهای تراکمی می‌شوند؛ و از طرف دیگر موجب افزایش مقاومت تک محوری نمونه‌ها می‌گردند. این افزایش مقاومت تابعی از درصد مواد افزودنی و زمان عمل آوری می‌باشد؛ همچنین مقایسه نتایج مقاومتی نشان داد که مقاومت خاک آلوده بهسازی شده در درصدی ثابت از مواد افزودنی و زمان عمل آوری یکسان، بیشتر از خاک بهسازی نشده است ، که این پدیده ممکن است ناشی از تولید مواد سیمانیته کننده و واکنش آلاینده فنل با مواد افزودنی ‌باشد. مقایسه نتایج مقاومتی بین دو افزودنی در بحث بهسازی خاک آلوده به فنل نشان می دهد که عملکرد GGBS فعال شده به وسیله منیزیم اکسید به نسبت آهک در درصد و زمان عمل آوری ثابت، مؤثرتر است. نتایج SEM هم نشان می دهد که افزایش مقاومت، ناشی از تغییرات در ساختمان خاک و تولید نوعی مواد سیمانیته کننده، می باشد.
کلیدواژه‌ها
بهسازی
خاک رسی
خاک آلوده
فنل
آهک

عنوان مقاله English

Comparison of the Effect of Lime Additives and Magnesium Oxide-Activated GGBS in Stabilizing a Clay Soil Contaminated with Phenol

نویسندگان English

Meysam Garshasbi
Ali Raeesi Estabragh
Jamal Abdollahi Ali Beik
Gholamali Vakili
Irrigation and Reclamation Department, University of Tehran
چکیده English

In this research, the stabilization of a natural clay soil contaminated with phenol was investigated using lime and Ground Granulated Blast Furnace Slag (GGBS) activated with Magnesium Oxide (MgO) additives. The phenol-contaminated soil, with a concentration of 2000 ppm, was artificially prepared in the laboratory. Tests to determine Atterberg limits and compaction were conducted on samples of both natural and contaminated soils mixed with 0%, 4%, 7%, and 10% of the mentioned additives. Additionally, unconfined compressive strength (UCS) tests were performed on the prepared samples at curing times of 7, 14, and 28 days. The results showed that the additives caused changes in the Atterberg limits and compaction parameters, and also increased the unconfined compressive strength of the samples. This increase in strength was dependent on both the percentage of additives and the curing time. Furthermore, a comparison of the strength results showed that the strength of the treated contaminated soil, at a fixed percentage of additives and curing time, was higher than that of the untreated soil. This phenomenon may be due to the production of cementitious materials and the reaction between the phenol contaminant and the additives. A comparison of the performance of the two additives in terms of stabilizing phenol-contaminated soil revealed that the MgO-activated GGBS was more effective than lime at a fixed percentage and curing time. SEM results also indicated that the increase in strength was due to changes in the soil structure and the production of cementitious materials.

کلیدواژه‌ها English

Remediation
clay soil
contaminated soil
phenol
lime
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