بررسی تاثیر سیمان و آهک بر بهسازی خاک رس آلوده به گلیسرول

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه خوارزمی، کرج، ایران

چکیده

آلودگی خاک از طریق فعالیتهای پتروشیمی و نشت مواد هیدروکربنی، تنها یک مسئله زیست محیطی محسوب نمی‌شود بلکه یک مسئله ژئوتکنیکی نیز هست. یکی از راهکارهای مناسب و اقتصادی جهت بهبود پارامترهای ژئوتکنیکی خاک­های آلوده به این مواد، بهسازی به روش افزودن مواد مناسب می‌باشد. در این پژوهش آزمایشگاهی، اثر سیمان‌ پرتلند با مقادیر 3، 6 و 9 درصد وزنی و آهک با مقادیر 10، 20 و 30 درصد وزنی در بهسازی خاک رس کائولینیت آلوده به ماده آلی گلیسرول با مقادیر 3، 6 و 9 درصد وزنی مطالعه شده است. بدین منظور نمونه های خاک تمیز، خاک آلوده، ترکیب خاک و سیمان، ترکیب خاک و آهک، خاک آلوده بهسازی شده با سیمان و خاک آلوده بهسازی شده با آهک، در زمان عمل آوری 7 روزه تهیه و آزمایش تعیین مقاومت تک محوری بر روی آنها انجام شده است. نتایج این پژوهش نشان داد که مقاومت خاک رس کائولینیت آلوده به گلیسرول نسبت به رس تمیز کاهش می‌یابد و میزان این کاهش با افزایش درصد آلاینده بیشتر می‌شود. بر اساس تجزیه و تحلیل میکروسکوپ الکترونی روبشی نیز مشخص شد که وجود گلیسرول از اندرکنش بهتر بین خاک- سیمان و خاک- آهک جلوگیری می‌کند. افزودن سیمان و آهک به خاک تمیز و خاک آلوده موجب افزایش مقاومت تک محوری آنها شده و ازدیاد درصد سیمانتاسیون سبب افزایش مقاومت می‌شود. همچنین نتایج نشان داد که بهسازی رس با 9 درصد وزنی سیمان‌ پرتلند تقریبا معادل 10 درصد وزنی آهک است. در مقادیر دیگر، میزان بهسازی خاک متفاوت بوده و وابسته به درصد وزنی به‌کار گرفته شده از مواد تثبیت‌کننده خواهد داشت. نزدیک ‌بودن ثابت دی‌الکتریک گلیسرول به آب و البته قطبیت آن، مشخصه‌های مهم این سیال آلی در بروز چنین رفتاری هستند. نتایج حاصل، با آنالیز تصاویر میکروسکوپ الکترونی نیز مورد بررسی و تایید قرار گرفتند.

کلیدواژه‌ها


عنوان مقاله [English]

Investigating the Effects of Portland Cement and Lime on Improving Glycerol-Contaminated Clay

نویسندگان [English]

  • Mohammad Hajimohammadi
  • Hamidi Amir
Department of Civil Engineering, Faculty of Engineering, Kharazmi University, Karaj, Iran
چکیده [English]

Soil contamination through petrochemical activities and leakage of organic hydrocarbon is not just an environmental problem and also can be considered as an important geotechnical issue. Adding amendment material is one of the most suitable and economical solutions to improve the geotechnical parameters of contaminated soil. In this study, the effect of Portland cement content (3, 6 and 9%) and lime content (10, 20 and 30%) on kaolinite clay contaminated with glycerol content (3, 6 and 9%) was investigated through an experimental program. For this purpose, the samples were prepared as mixtures of clean or glycerol-contaminated clay with different Portland cement and lime contents for 7 days curing time. Then, unconfined compressive strength (UCS) tests were conducted on the samples. The results showed a reduction of the strength of glycerol-contaminated kaolinite clay. The strength reduction increased with increase in degree of contamination. Based on the scanning electron microscopy (SEM) analysis, it was found that the presence of glycerol prevents the interaction between soil-cement particles. However, adding Portland cement and lime to uncontaminated and contaminated soil increased the strength. The rate of increase in UCS increased with Portland cement and lime content. Also, the results of soil improvement showed that the strength of soil-cement mixture containing 9% Portland cement is approximately equal to that of the soil mixed with 10% lime. In other contents, the degree of improvement was dependent to the applied cement content. The main reasons were polar behavior of glycerol and its dielectric constant. The results were also analyzed and proved using the images taken by SEM.

کلیدواژه‌ها [English]

  • kaolinite clay
  • Glycerol
  • improvement
  • Unconfined Compressive Strength
  • Scanning Electron Microscopy
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