تثبیت خاک ماسه‌ای با ژئوپلیمر بر پایه نانو مواد و پوزولان تفتان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد، دانشکدة مهندسی عمران و نقشه برداری، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، کرمان، ایران

2 دانشکده مهندسی عمران، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، کرمان، ایران.

3 عضو هیئت علمی دانشگاه شهید باهنر کرمان

چکیده

مروزه سیمان به عنوان پرمصرف‌ترین و رایج ترین تثبیت کننده خاک، مورد استفاده قرار گرفته است. ولی با توجه به آثار نامطلوب زیست محیطی سیمان، ضرورت استفاده از ژئوپلیمرها بدلیل جنبه های مطلوب زیست محیطی به عنوان جایگزینی مناسب برای سیمان حائز اهمیت می‌باشد. در این مطالعه از ژئوپلیمر بر پایه پوزوالن طبیعی تفتان و نانومواد که شامل نانوسیلیس و نانورس می‌باشد، برای تثبیت خاک ماسه‌ای استفاده شده است. پارامترهای مختلف مانند نوع نانومواد، مقدار نانومواد، نسبت محلول فعال کننده قلیایی و زمان عمل آوری به عنوان عوامل موثر بر رفتار نمونه‌های تثبیت شده مورد توجه قرار گرفت. برای ارزیابی تاثیر ژئوپلیمر و نانومواد بر رفتار مکانیکی نمونه‌ها، آزمایش مقاومت فشاری محدودنشده و مقاومت کششی که معیار اصلی مقایسه نمونه‌ها بوده‌اند، انجام شده است. از طرفی تحلیل XRD و SEM جهت بررسی ریزساختاری خاک تثبیت شده، انجام گرفت. نتایج نشان می‌دهد که ژئوپلیمر بر پایه پوزولان طبیعی و نانومواد، جایگزین مناسبی برای مواد سیمانی در تثبیت خاک هستند، به طوری که افزودن پوزولان و نانومواد به خاک باعث افزایش مقاومت و بهبود رفتار مکانیکی نمونه‌ها می‌شود. از طرفی با افزایش میزان نانومواد (تا 2 درصد) و محلول قلیایی، مقاومت فشاری و کششی نمونه ها افزایش می‌یابد. مقاومت‌های به دست آمده، با مقاومت نمونه‌های تثبیت شده با سیمان مورد مقایسه قرار گرفته شده است. همچنین نتایج تحلیل ریزساختاری نشان دهنده واکنش شدید افزودنی های شیمیایی و تشکیل ژل آلومینوسیلیکاتی در ترکیبات ژئوپلیمری است که خود باعث افزایش ظرفیت باربری خاک و تثبیت آن می‌شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Stabilization of sandy soil with geopolymers based on nanomaterials and Taftan pozzolan

نویسندگان [English]

  • Reyhane Baghban SHokatabad 1
  • Vahid Toufigh 2
  • Mohammad Mohsen Toufigh 3
1 Masters student of Civil and Surveying Engineering, Graduate University of Advanced Technology, Kerman, Iran.
2 Department of Civil Engineering, Graduate University of Advanced Technology, Kerman, Iran
3 Faculty of Civil Engineering, Shahid Bahonar University of Kerman, Kerman, Iran.
چکیده [English]

In this study, geopolymers based on Taftan natural pozzolan and nanomaterials (nanoclay and nanosilica) were used to stabilize sandy soil. Various parameters such as type of nanomaterial, amount of nanomaterial, alkaline activator solution ratio and curing time were taken into account as the affecting factors on the behavior of stabilized specimens. The unconfined compressive strength (UCS) tests were performed to evaluate the effect of geopolymer and nanomaterials on sandy soil stabilization. Then, the X-ray diffraction and scanning electron microscopy were performed to verify the microstructure of the stabilized soil. The results showed that the addition of pozzolan and nanomaterials to soil and increasing the amount of alkaline solution caused an increase in the compressive strength of the soil. Additionally, the strength of geopolymer specimens increased with the addition of nanomaterials up to 2%, and subsequently due to the accumulation of nanomaterials decreased. The microstructural analysis indicates a strong reaction of chemical additives and the formation of aluminosilicate gel in geopolymer compounds, which itself increases the load-bearing capacity of the soil and stabilized. Based on this study, natural Taftan pozzolan and nanomaterials are appropriate and beneficial alternative materials in the stabilization of earth structures.

کلیدواژه‌ها [English]

  • Soil stabilization
  • Geopolymer
  • Taftan pozzolan
  • Nanomaterials
  • Alkaline solution
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