بررسی آزمایشگاهی امکان استفاده مصالح بازیافتی برای بهبود مشخصات مکانیکی فصل مشترک ژئوتکستایل و خاک ماسه ای

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

دانشکده فنی، دانشگاه محقق اردبیلی

چکیده

با استفاده از مصالح بازیافتی ناشی از تخریب ساختمان­ ها جهت تقویت فصل مشترک بین مسلح ­کننده و ماسه‌ سست، علاوه بر این­که می‌توان از مصالح بازیافتی ساختمانی مجدداً استفاده نمود، می­توان از روش تسلیح برای افزایش ظرفیت باربری خاک­ های ماسه‌ای ریزدانه و سست نیز استفاده نمود. در این تحقیق، سه نوع مصالح بازیافتی حاصل از تخریب ساختمان­ ها شامل سفال، کاشی و سرامیک جهت بهبود خواص مقاومتی فصل مشترک ماسه و مصلح ­کننده و افزایش مقاومت بیرون­ کشیدگی مسلح ­کننده از ماسه استفاده شده است. برای مطالعه تأثیر مواد درشت­ دانه حاصل از تخریب ساختمان­ ها در بهبود مشخصات مکانیکی فصل مشترک ماسه و مسلح کننده، آزمایشات بیرون ­کشیدگی انجام شده است. برای این منظور مصالح بازیافتی درشت­ دانه به ­صورت لایه‌هایی با ضخامت ­های ۲، ۴ و ۸ سانتی­متر در فصل مشترک مسلح ­کننده و ماسه قرار داده شده است. آزمایش­ های بیرون‌کشیدگی صورت گرفته در این تحقیق در تنش ­های عمودی ۲۵، ۵۰ و ۷۵ کیلوپاسکال انجام شد. نتایج آزمایش نشان‌دهنده بهبود قابل ملاحظه مقاومت فصل مشترک و ظرفیت بیرون‌کشیدگی خاک ماسه ­ای می­ باشد. مقاومت برشی فصل مشترک خاک و ژئوتکستایل کاملاً به ضخامت لایه­ های درشت ­دانه ­های مورد استفاده و سطح تنش عمودی مورد استفاده بستگی دارد. ظرفیت بیرون ­کشیدگی مسلح­ کننده با افزایش ضخامت لایه ­های بازیافتی تا 200 درصد در مقایسه با ماسه افزایش یافته است. براساس داده ­های آزمایشگاهی بیشترین مقدار افزایش مقاومت بیرون کشیدگی برای نمونه‌های تهیه شده از سرامیک مشاهده شده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Experimental Evaluation of Application of Demolition Waste Material to Improve the Interface Parameters of Geotextile and Sand

نویسندگان [English]

  • Mehdi Hosseinzadeh Sotoubadi
  • Ahad Ouria
  • Amin Gholizad
Faculty of Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
چکیده [English]

Mechanical properties of mechanically stabilized earth structures depend on the mechanical parameters of the fill material, tensile strength of reinforcement elements, and the interface properties of the geosynthetic and the fill material (Ouria and Mahmoudi, 2018). Optimal design of reinforced earth systems demands for a pullout capacity of reinforcements proportional to their tensile strength (Ouria et al., 2019) (Ouria et al., 2021) (Ouria et al., 2022). That is why the utilization of high strength reinforcements in reinforced earth structures has not been developed extensively. Anchorage of high strength reinforcements requires long anchorage length of mechanically anchored ends. On the other hand, rapid development of societies requires renewal of several structures and substructures (Ouria et al., 2020)(Ouria and Heidarly, 2021)(Ouria and Sadeghpour, 2022). The replacement of existing substructures requires new materials and also produces demolition waste material in large quantities (Vieira and Pereira, 2015). The huge rate of the production of demolition waste material in the recent years raised concerns about the harmful impacts of these material in the environment (Savadkoohi and Reisi, 2020). Recycling of these waste material and their utilization in new projects could be proper step in response to the raised concerns. In this study the applicability of demolition waste material in the reinforced soil structures was investigated in the laboratory.

کلیدواژه‌ها [English]

  • Demolition waste material
  • Reinforced soil
  • Interface
  • Geotextile
  • Pullout
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