تقویت پارامترهای مقاومتی خاک ماسه فیروزکوه بهسازی شده با صمغ گیاهی فارسی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده عمران، دانشگاه علم وصنعت ایران، تهران، ایران

چکیده

روش‏ های بهسازی متعددی برای بهبود مشخصات مکانیکی و فیزیکی خاک برای احداث سازه و مانند آن پیشنهاد شده ‏است. یکی از روش های بهسازی، استفاده از عناصر دوست دار محیط زیست مانند صمغ گیاهی فارسی به عنوان یک بایوپلیمرجدید هیدروکرولیدی تجدید‏پذیر است. در این راستا، در پژوهش آزمایشگاهی حاضر تاثیر اضافه کردن این صمغ به ماسه فیروزکوه 161 مورد بررسی قرار گرفت.  مخلوط آب - صمغ فارسی در درصدهای مختلفی نسبت به وزن خاک خشک اضافه شد و نمونه‏ های ساخته شده تحت آزمایش مقاومت فشاری محدود نشده قرار گرفت تا حالت های بهینه ترکیب شناسایی شود. علاوه بر متغیر بودن درصد های وزنی آب و صمغ اضافه شده به خاک، اثر مقدار وزنی خاک، اثر دمای گیرش (دمای اتاقک-گرمکن)، اثر مدت گیرش (7 تا 56 روز) بررسی شدند. برای تفسیر اثر افزودن صمغ فارسی، چندین آزمایش میکروسکوپ الکترونی روبشی برروی نمونه های خشک منتخب انجام گردید. نتایج به وضوح افزایش مقاومت فشاری محدود نشده  نمونه‌های بهسازی‏ شده با صمغ فارسی  تا ۴ مگاپاسکال ناشی از وجود گروه‏ های فراوان کربوکسیل و هیدروکسیل در صمغ را نشان می دهد. نمونه های عمل‏ آوری شده در دمای اتاق با رطوبت نسبی 15% به دلیل خاصیت آب دوستی صمغ گیاهی و افزایش انعطاف پذیری پیوند های ایجاد شده، مقاومت کمتری نسبت به نمونه های مشابه عمل آوری شده در گرمکن را تجربه کردند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Enhancing strength parameters of Firoozkooh sandy soil improved with Persian herbal gum

نویسندگان [English]

  • Masoud Mohseninia
  • Hosein salehzadeh
School of civil engineering, Iran university science and technology, Tehran, Iran
چکیده [English]

Various improvement methods have been proposed to improve the mechanical and physical characteristics of soil for construction and other similar matters. One of the improvement methods is using environmentally-friendly elements such as Persian herbal gum as a renewable hydrocolloid biopolymer. Regarding this, in the present laboratory study, the effect of adding this gum to the Firoozkooh sand (No 161) was investigated. Persian gum-water mixture was added in different percentages relative to the weight of dry soil, and the created samples were subjected to unconfined compressive strength test to identify the optimal conditions of the composition. In spite of the variability of the weight percentages of water and gum added to the soil, the effect of the weight of the soil, curing temperature (room or oven temperature), and curing time (7 to 56 days) were investigated. To interpret the effect of Persian gum addition, several scanning electron microscope tests were performed on selected dry samples. The results clearly revealed an increase in the unconfined compressive strength of the samples improved with Persian gum up to 4 MPa due to the presence of many carboxyl and hydroxyl groups in the gum. Samples cured at room temperature with relative humidity of 15% displayed lower unconfined compressive strength than similar samples cured at oven temperature due to the hydrophilic properties of herbal gum and increased flexibility of the created bonds.

کلیدواژه‌ها [English]

  • Sandy soil improvement
  • Persian gum
  • Firoozkooh sand
  • Uniaxial compressive strength
  • Bio-cemented sand
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