مطالعه امکان‌سنجی تثبیت خاک ماسه‌ای با ژئوپلیمر بر پایه پوزولان طبیعی و پودر شیشه

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی عمرانو نقشه برداری، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، کرمان، ایران.

چکیده

در مهندسی ژئوتکنیک، بهسازی خاک‌های مسئله‌دار با افزودنی‌های شیمیایی سابقه طولانی دارد. در سالیان اخیر آثار نامطلوب زیست‌محیطی سیمان پرتلند، به عنوان پرمصرف‌ترین ماده ساخت و متداول‌ترین افزودنی شیمیایی در تثبیت خاک،  مورد توجه متخصصان صنعت ساخت جهان قرار گرفته‌است. در این راستا می‌توان، مواد ژئوپلیمری و فعال‌شده قلیایی را بهترین جایگزین سیمان پرتلند مطرح کرد. در این مطالعه از ژئوپلیمر بر پایه پوزولان طبیعی برای تثبیت خاک ماسه‌ای استفاده شده‌است. هم‌چنین تلاش شده‌است تا از خواص شیمیایی پودر شیشه به عنوان یک ماده ضایعاتی برای جایگزینی پوزولان طبیعی استفاده شود. محلول فعال‌کننده دو نوع بوده است. نوع І ترکیب سدیم هیدروکسید و سدیم سیلیکات مایع و نوع П شامل غلظت‌های مختلف سدیم هیدروکسید است. علاوه بر آزمایش مقاومت فشاری محدودنشده که معیار اصلی مقایسه نمونه‌ها بوده است، تحلیل پراش اشعه ایکس (XRD) و میکروسکوپ الکترونی روبشی (SEM) جهت بررسی ریزساختاری ترکیبات ژئوپلیمری انجام شده‌است. نتایج نشان می‌دهد که با افزایش مقدار پوزولان و فعال‌کننده، مقاومت فشاری محدودنشده افزایش می‌یابد. هم‌چنین با افزایش غلظت فعال‌کننده نوع П، مقاومت فشاری محدودنشده نمونه‌ها افزایش می‌یابند. مقاومت­های به‌دست‌آمده، با مقاومت نمونه­های تثبیت‌شده با سیمان مورد مقایسه قرار گرفته شده‌است. نتایج تحلیل ریزساختاری نشان‌دهنده واکنش شدید افزودنی‌های شیمیایی و تشکیل ژل آلومینوسیلیکاتی در ترکیبات ژئوپلیمری است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Feasibility Study of Sandy Soil Stabilization with Glass Powder and Natural Pozzolan Based Geopolymer

نویسندگان [English]

  • M. Sabbagh Gol
  • V. Toufigh
Faculty of Civil and Surveying Engineering, Graduate University of Advanced Technology, Kerman, Iran
چکیده [English]

Improvement of problematic soils using chemical additives has had a long history in the field of geotechnical engineering. One of the common materials used for soil stabilization is Portland cement that has had detrimental impacts on the environment thus engineers are looking for a green material with the same characteristics as an alternative. Geopolymer materials have recently drawn attentions of civil engineers since they have similar properties to cement. In current study, natural pozzolan based geopolymer has been used for improvement of sandy soil. Besides efforts have been made to use glass powder as a replacement for natural pozzolan. Two kinds of alkaline activators were used. The first type was a combination of sodium hydroxide and liquid sodium silicate and the second type had different concentrations of sodium hydroxide. Beside the unconfined compressive strength test which was the main comparison criteria, the microstructural characteristics of geopolymeric samples were investigated with X-ray diffraction (XRD) and scanning electron microscopy (SEM). Results indicated that with the increase of pozzolan and activators, the unconfined compressive strength of the samples were increased. In addition, increasing the concentration of type II activator will lead to the increase of unconfined compressive strength of the samples.

کلیدواژه‌ها [English]

  • Soil Stabilization
  • Geopolymer
  • Natural Pozzolan
  • Glass powder
  • Alkaline Activation
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