تثبیت بستر رسی با استفاده از ژئوپلیمر سنتز شده از سرباره، خاکستربادی، دیاتومیت و خاکستر پوسته برنج

غنی زاده, علیرضا; میرزایی, کوروش; بختیاری, سمیه

doi:10.22119/jte.2021.282549.2528

تثبیت بستر رسی با استفاده از ژئوپلیمر سنتز شده از سرباره، خاکستربادی، دیاتومیت و خاکستر پوسته برنج

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ دانشیار، دانشکده عمران، دانشگاه صنعتی سیرجان، کرمان، ایران

² دانشجوی کارشناسی ارشد، دانشکده عمران، دانشگاه صنعتی سیرجان، کرمان، ایران

³ استادیار، دانشکده عمران، دانشگاه صنعتی سیرجان، کرمان، ایران

10.22119/jte.2021.282549.2528

چکیده

هدف این تحقیق ارزیابی و مقایسه مشخصات خاک رس با خصوصیات خمیری بالای تثبیت‌شده با ژئوپلیمر سنتز شده از ضایعات صنعتی و خاکستر پوسته برنج است. در این تحقیق از سرباره کوره ذوب‌آهن، خاکستربادی و دیاتومیت به‌عنوان مادۀ پایه و از محلول سدیم هیدروکسید 8.68 مولار و محلول سیلیکات سدیم استخراج‌شده از پوسته برنج به‌عنوان محلول فعال‌کننده قلیایی جهت تثبیت استفاده‌شده است. تثبیت با استفاده از ژئوپلیمر سنتز شده بر پایۀ سرباره، خاکستربادی و دیاتومیت با درصد‌های 10، 20 و 30 درصد وزنی خاک خشک و تراکم در رطوبت بهینه و در سه زمان عمل‌آوری 7 ،28 و 90 روزه انجام شده است. نتایج به‌دست‌آمده از آزمایش‌ها نشان داد که استفاده از ژئوپلیمر به‌عنوان تثبیت‌کننده باعث بهبود مقاومت فشاری و کششی، افزایش مدول یانگ و کاهش کرنش شکست خاک می‌شود. بیشترین میزان افزایش مقاومت فشاری مربوط به خاک رس تثبیت‌شده با ژئوپلیمر سنتز شده با 30 درصد سرباره بوده است که نسبت به نمونۀ تثبیت نشده به میزان 2/25 برابر افزایش مقاومت داشته است. همچنین نمونه‌های تثبیت‌شده با ژئوپلیمر سنتز شده با 30 درصد خاکستربادی و 30 درصد دیاتومیت به ترتیب نسبت به نمونه تثبیت نشده 05/4 و 72/12 برابر مقاومت فشاری بیشتری داشتند. نتایج این تحقیق همچنین نشان داد که تثبیت خاک رس با استفاده از ژئوپلیمر سبب افزایش قابل ملاحظۀ مقاومت کششی نمونه‌ها می‌شود، به‌طوری‌که نمونه‌های تثبیت‌شده با ژئوپلیمر 30 درصد سرباره، 30 درصد خاکستربادی و 30 درصد دیاتومیت به ترتیب نسبت به نمونه تثبیت نشده 14/23 ، 58/7 و 5/12 برابر مقاومت کششی بیشتری داشتند.

کلیدواژه‌ها

20.1001.1.20086598.1401.13.4.9.3

عنوان مقاله [English]

Stabilization of Clay Subgrade using Geopolymer Synthesized from Slag, Fly-Ash, Diatomite and Rice Husk Ash

نویسندگان [English]

Ali Reza Ghanizadeh ¹
Koroush Mirzaei ²
Somayeh Bakhtiari ³

¹ Department of Civil Engineering, Sirjan University of Technology, Sirjan

² Department of Civil Engineering, Sirjan University of Technology, Sirjan

³ , Department of Civil Engineering, Sirjan University of Technology, Sirjan

چکیده [English]

This paper aims to investigate and compare the properties of highly plastic clay soil stabilized by geopolymers synthesized from various industrial residues and rice husk ash. To this end, steel slag, fly-ash and diatomite were used as the base material, and NaOH solutions of 8.68 M and Na₂SiO₃ solutions extracted from rice husk ash were used as an alkaline activator for stabilization. Stabilization was performed using 10, 20 and 30 percent of base materials by dry weight of soil. Samples were compacted at optimum moisture content and were cured for 7, 28 and 90 days. The results of the experiments show that the application of geopolymer as a stabilizer improve the compressive and tensile strength, increase Young's modulus and reduce the failure strain of the stabilized clay soil. The highest increase in the unconfined compressive strength (UCS) was related to stabilized clay with geopolymer synthesized using 30% of steel slag, its UCS was 25.2 times higher than the untreated clay soil. Also, the samples stabilized with geopolymer synthesized using 30% of fly-ash and 30% of diatomite showed the UCS of 4.05 and 12.72 times more than the untreated clay soil, respectively. The results of this study also showed that the stabilization of clay using geopolymer significantly increases the indirect tensile strength (ITS) of the samples, so that the samples stabilized with geopolymers based on the 30% of steel slag, 30% of fly-ash and 30% of diatomite, had an ITS of 23.14, 7.58 and 12.5 times more than untreated clay soil, respectively.

کلیدواژه‌ها [English]

Clayey Subgrade
Compressive and Tensile Strength
Geopolymer
Diatomit
Rice Husk Ash

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