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بررسی خواص ژئوتکنیکی خاکهای مسئله دار ضعیف بهسازی شده در کاربرد همزمان آهک، خاکستر بادی و ضایعات لاستیک | ||
| نشریه مهندسی عمران امیرکبیر | ||
| دوره 57، شماره 6، شهریور 1404، صفحه 911-938 اصل مقاله (1.36 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2025.22660.8024 | ||
| نویسندگان | ||
| مهرداد امینی زاده1؛ مهدی مخبری* 1؛ مهدی مؤمنی رق آبادی2 | ||
| 1گروه مهندسی عمران، واحد استهبان، دانشگاه آزاد اسلامی، استهبان، ایران | ||
| 2گروه مهندسی عمران، دانشکده فنیمهندسی، واحد کرمان، دانشگاه آزاد اسلامی، کرمان، ایران | ||
| چکیده | ||
| بسیاری از پروژههای عمرانی باید بر خاکهای ضعیف و یا مسئلهدار احداث شوند. گاهی بستر راهها یا ساختگاه احداث بناها از رسهای ضعیف و یا ماسه بادی تشکیل شده ان که جز با اصلاح خواص آنها قابل استفاده نیستند. از گذشته تاکنون آهک به عنوان یکی از مصالح اصلاح خاک شناخته میشده است. گاهی نیز با کاربرد همزمان آهک و خاکستر بادی چسبندگی خاک را افزایش میداده اند. در مناطق گرم و کویری از این دو مصالح سنتی برای کاهش نشست پی و ایجاد لایه مستحکم در بستر راهها استفاده میشود. از طرفی در سالهای اخیر به دلیل کاهش اثرات منفی زیست محیطی، استفاده از لاستیکهای فرسوده در بهسازی خاک مورد توجه قرار گرفته است. به دلیل عملکرد متفاوت افزودنیهای سنتی با ضایعات لاستیک، بررسی تأثیر همزمان اجزاء لاستیک فرسوده، مصالح سنتی و خاکستر بادی که در مناطق کویری ایران به فراوانی دیده میشود، ضرورت پیدا میکند. در این تحقیق تاثیر افزودن پودر لاستیک فرسوده و الیاف لاستیک بر روی خواص مکانیکی افزودنی آهک و آهک-خاکستر بادی بررسی شده است. آزمایشها و نتایج نشان میدهد که افزودن پودر لاستیک مقاومت فشاری خاک و سایر پارامترهای مقاومتی خاک بهسازی شده را افزایش میدهد. همچنین افزایش پودر لاستیک به مصالح بهسازی شده با مصالح سنتی افزایش شکل پذیری را به همراه دارد. از طرفی استفاده از الیاف لاستیک به طور قابل توجهی مقاومت فشاری، شکلپذیری، مدول الاستیک، مدول حجمی(بالک)، مدول برجهندگی و مقاومت برشی را در تمام زمانهای عملآوری بهبود میبخشد، ولی افزایش الیاف باعث کاهش کرنش شکست میگردد. بدیهی است که بهبود مشخصات ژئوت کنیکی خاک بهسازی شده متناسب با انتخاب بهینه افزودنی و مسلح کننده میباشد. در یک نتیجه گیری کلّی افزودن 12% پودر لاستیک فرسوده و 1% الیاف لاستیک به آهک-خاکستر بادی مناسب ترین نتیجه را برای بهسازی خاک ارائه میدهد. | ||
| کلیدواژهها | ||
| پودر لاستیک؛ الیاف؛ خاک ضعیف. خاکستربادی؛ آهک | ||
| موضوعات | ||
| بهسازی خاک ها | ||
| عنوان مقاله [English] | ||
| Evaluation of Geotechnical Properties in Weak Soils Stabilized by Combined Application of Lime, Fly-Ash, Geopolymer, and Scrap Tires | ||
| نویسندگان [English] | ||
| MEHRDAD AMINIZADEH1؛ Mehdi Mokhberi1؛ Mehdi Momeni Roghabadi2 | ||
| 1Ph. D. candidate, Department of Civil Engineering, Estahban Branch, Islamic Azad University, Estahban, Iran, | ||
| 2Department of Civil Engineering, Kerman Branch, Islamic Azad University, Kerman, Iran | ||
| چکیده [English] | ||
| A lot of civil engineering projects must be constructed on weak or problematic soils. In some cases, road subgrades or building foundations often consist of soft clays or windblown sands that necessitate soil improvement for usability. Lime has served as a conventional stabilizer, with combined lime-fly ash applications further enhancing soil cohesion. These traditional materials are widely used in desert and arid environments to mitigate foundation settlement and strengthen road subgrades. Recently, scrap tires have gained traction in soil stabilization due to their reduced environmental impact. However, the synergistic effects of rubber components (crumb rubber powder and rubber fibers) with traditional stabilizers remain unexplored, primarily because rubber incorporation weakens lime mortar strength. This study examines the influence of combined crumb rubber powder (0–30% at 4% increments) and rubber fibers (0–2%: 0%, 1%, 1.5%, 2%) on the mechanical properties of lime-treated and lime-fly ash-stabilized soils. Results indicate that crumb rubber powder slightly reduces the compressive strength of stabilized soil, whereas rubber fibers significantly improve compressive strength, ductility, failure strain, elastic modulus, bulk modulus, resilience modulus, and shear strength across all curing periods. Furthermore, the optimal combination is achieved with 12% crumb rubber and 1% rubber fibers added to lime-fly ash mixtures. | ||
| کلیدواژهها [English] | ||
| Rubber Powder, Rubber Fibers, Fly Ash, Lime, Weak Soils | ||
| مراجع | ||
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