تأثیر استفاده از انرژی فراصوتی و نانولوله‌ی کربنی بر روی مقاومت برشی خاک های مسئله‌دار

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده فنی، دانشگاه محقق اردبیلی، اردبیل، ایران

چکیده

خاک های مسئله دار خصوصیات ژئوتکنیکی نامطلوبی دارند و باید اصلاح یا جایگزین گردند؛ مانند خاک های تورمی، واگرا و خاک هایی که در زمان اشباع شدگی مقاومتشان کاهش می یابد. خاک های سیلتی و ماسه بادی علاوه بر خصوصیات فیزیکی نامناسب، در زمان اشباع شدگی مقاومت پایینی دارند و از اینرو در رسته خاک های مسئله دار قرار می گیرند. تحقیقات نشان داده است که تثبیت این نوع خاکهای مسئله دار با سیمان، نتیجه خوبی را ارائه داده است. در این مطالعه تغییرات مقاومت برشی دو نوع خاک ماسه بادی و خاک سیلتی اشباع به وسیله سیمان و مسلح کنندهای بی نظیر با نام نانولوله کربنی با مقاومت، مدول الاستیسیته و سختی بسیار بالا (حتی بالاتر از فولاد) و سایر ویژگی های منحصر به فرد، بررسی شده است. تحقیقات در مورد استفاده از این ماده در تثبیت شیمیایی خاک کمتر به چشم می خورد. نانولوله های کربنی همدیگر را به شدت جذب می کنند، برای استفاده حداکثر از خصوصیات بی نظیر آنها، این مواد باید به وسیله انرژی فراصوتی (عامل مکانیکی) و سورفکتانت (عامل شیمیایی) از هم جدا شوند. از اهداف این تحقیق، بررسی تغییرات انرژی فراصوتی لازم برای جداسازی و همگن سازی محلول نانولوله بر مقاومت برشی خاک های مورد مطالعه است. از میان انرژی های انتخاب شده برای پراکندگی نانو ذرات انرژی 500 ژول بر میلی لیتر، بهترین نتیجه را ارائه داده است. همچنین مقدار بهینه سورفکتانت مورد استفاده 1/5درصد برای خاک سیلتی و 1درصد برای خاک ماسه ای به دست می آید. با افزودن 0/125درصد نانولوله کربنی چند جداره (نسبت به وزن سیمان،) مقاومت برشی خاک سیلتی و ماسه ای به ترتیب 19/7درصد و 21درصد افزایش داشته است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of Ultrasonic Energy and Multiwall Carbon-nanotube on the Shear Strength of Problematic Soils

نویسندگان [English]

  • A.R. Negahdar
  • B. Zareei
Department of Civil Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
چکیده [English]

Problematic soils are those that make the construction of foundations extremely difficult. These soil should be replaced or modified. These types of soils are problematic, such as swelling soil, dispersive soil and the soils that loss their strength at saturated conditions. As silty soil and quicksands have low strength at saturated condition, it seems that stabilization of these soils is necessary. In literature, stabilizing these soils by cement is more effective. On the other hand, by developments in nanotechnology within last three decades, researchers discovered a material with unique properties, named as carbon nanotube. The carbon nanotube has very high strength even higher than steel, high elastic module and toughness and other unique properties. Within last three decades, many studies are concerned in applying this material in cement composites, but only we can find a few works related to use of this material in soil stabilization. Since carbon nanotube attract each other, we should separate nanotube particles. In this study, different values of ultrasonic energy (as mechanical agent) and polycarboxilate based super plasticizer solution (as chemical agent) was used to overcome carbon nanotubes agglomeration problem. As it is not possible to use carbon nanotubes in dry state, to investigating the effect of carbon nanotubes on the soils, the aqueous solution of carbon nanotube was added to the soil, using wet mix method. The samples were cured in water for 7 days. After performing direct shear test the shear strength and its parameters were evaluated. The results show using 0.125 % carbon nanotube and applying different ultrasonic energy to the carbon nanotubes solution the highest benefit of ultrasonic energy achieved when it used as 500j/ml. Comparing to the samples that threated by defective ultrasonic energy, it is observed that the shear strength of silty and sandy soil was improved as 19.7% and 21%, respectively.

کلیدواژه‌ها [English]

  • Silty Soil
  • Quicksand
  • Carbon Nanotube
  • Soil Stabilization
  • Shear Strength Parameters

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نشریه مهندسی عمران امیرکبیر
دوره 50، شماره 3
مرداد و شهریور 1397
صفحه 485-498

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