مطالعه آزمایشگاهی تثبیت خاک طبیعی با ژئوپلیمر مبتنی بر پودر شیشه و کاربید کلسیم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

2 دانشکده فنی و مهندسی، دانشگاه گلستان، گرگان، ایران

چکیده

مسائل زیست محیطی، اقتصادی، فنی و محدودیت منابع انرژی و مواد اولیه در فرآیند تولید سیمان، ضرورت استفاده جایگزین سیمان را ایجاد می‌کند، بدین منظور سه سری خاک، به نام‌های ماسه با نسبت‌های مختلف لای یا خاک طبیعی (Sx)، خاک تثبیت شده با سیمان (CSS)، و خاک تثبیت شده با ژئوپلیمر بر پایه پودر شیشه و کاربید کلسیم (GSS) از نظر مکانیکی و دینامیکی مطالعه شده است. استحکام، مدول برشی و میرایی نمونه‌ها تحت آزمایش‌های مقاومت فشاری (UCS( و سه محوری سیکلی تحت فشارهای همه جانبه و کرنش‌های برشی مختلف و نسبت‌های لای 10%، 25% و 50% مورد مطالعه قرار گرفت. طرح اختلاط مختلفی از مواد ژئوپلیمری برای آزمایش UCS تهیه و نسبت بهینه طرح اختلاط که در آن ژئوپلیمر حاصل شامل بالاترین مقاومت فشاری خاک باشد، به عنوان ژئوپلیمر بهینه مشخص گردید. نتایج بیانگر مؤثر بودن ژئوپلیمر حاصل برای تثبیت خاک است. نسبت‌های ترکیبی ژئوپلیمر بهینه از نظر حداکثر مقاومت، متشکل از 15% پودر شیشه، 7% کاربید کلسیم و 25% لای، به دست آمد که غلظت‌های بیشتر/کمتر از مقدار بهینه، مقاومت فشاری را کاهش می‌دهد. مقاومت فشاری خاک-ژئوپلیمر بهینه حدود 16% بیشتر از خاک تثبیت شده با سیمان 4% بود. افزایش تنش محصور کننده، مدول برشی را در کرنش‌های کوچک بهبود می‌بخشد، در حالی که تأثیر ناچیزی بر نسبت میرایی دارد. مقاومت فشاری، سختی و مدول برشی خاک ژئوپلیمری برعکس میرایی، بیشتر از خاک سیمانی بود. مقاومت برشی و میرایی خاک‌ها با نسبت‌های مختلف ریزدانه تا حد معینی از ریزدانه آستانه (50% لای)، افزایش می‌یابد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental study of stabilization of natural soil with geopolymer based on glass powder and calcium carbide

نویسندگان [English]

  • Seyyed Erfan Hosseini 1
  • Alireza Tabarsa 2
  • Amin Bahmanpour 1
1 Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 Department of Civil Engineering, Faculty of Engineering, Golestan University, Golestan, Iran
چکیده [English]

Considering cement environmental sustainability issues, an experimental comparative study on three series of untreated silty sandy soil, cement-stabilized, and geopolymer-stabilized soil mixtures based on glass powder, in terms of their static and dynamic properties are presented. Results showed that the optimal geopolymer combination ratios from the viewpoint of bearing the maximum compression, was obtained composed of 15% glass powder, 7% calcium carbide, and 25% silt, and concentrations of higher/lower of the optimum value, will be reduced the compressive strength. Dynamic shear modulus of soil-geopolymer was higher than soil-cement, while it was the reverse in terms of damping ratio. Shear strength, stiffness and damping ratio of the soils with various fines content increases up to fines threshold (50% silt). optimal values of soil static and dynamic properties were found in 25% and 50% silt, respectively.

کلیدواژه‌ها [English]

  • Cyclic triaxial test
  • UCS
  • Geopolymer
  • Glass powder
  • Calcium carbide
  • Cement
  • Soil dynamic properties

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نشریه مهندسی عمران امیرکبیر
دوره 54، شماره 12
اسفند 1401
صفحه 4827-4846

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