یادداشت پژوهشی مقایسه تثبیت کننده های آهک، سیمان و CBR PLUS برای تثبیت خاک رس

نوع مقاله : علمی - پژوهشی

چکیده

 به دلیل کاهش شدید مقاومت و قابلیت تورم در حضور آب، خاک رس  یکی از خاکهای مسئله دار در راهسازی می باشد. با این حال، درخیلی از مناطق، خاک رس تشکیل دهنده اصلی خاکهای بسترراه می باشد. یکی از راهکارهای کاهش مشکلات مربوط به خاک رس تثبیت با مواد افزودنی است. از عوامل موثر در انتخاب نوع ماده  تثبیت کننده، تاثیرآن برخصوصیات فیزیکی و مکانیکی خاک مورد نظر در جهت رسیدن به اهداف تثبیت است. این مقاله،  نتایج یک مطالعه آزمایشگاهی، که درآن اثرات دو ماده تثبیت کننده متعارف آهک و سیمان، و یک تثبیت کننده پلیمری به نام CBR PLUS، برروی یک نوع خاک رس بررسی شده اند را تشریح می کند. درصدهای مختلفی از هریک از مواد تثبیت کننده به خاک مورد نظر اضافه شده و خصوصیات تراکم، حدود اتربرگ، مقاومت فشاری، نسبت باربری کالیفرنیا درحالت خشک و اشباع و نفوذپذیری خاک تثبیت شده مورد ارزیابی قرارگرفته اند. نتایج نشان دهنده این است که CBR PLUS وسیمان دامنه خمیری خاک را از 16 به 9 کاهش می دهند، ولی آهک آن را تا 13 کاهش می دهد. همچنین، اثر CBR PLUS درکاهش نفوذ پذیری بیش از سیمان وآهک است. بیشترین افزایش مقاومت مربوط به افزودنی سیمان است که مقاومت تک محوری را از 55/1 به 2/5 کیلوگرم بر سانتی متر مربع افزایش می دهد.  بالاترین نسبت  CBRاشباع به CBR خشک با تثبیت کننده آهک وبه مقدار 40% به دست می آید.

کلیدواژه‌ها

عنوان مقاله [English]

Comparison of Lime, Cement and CBR PLUS Additives for Stabilizing Clay Coil

چکیده [English]

Due to its swelling and losing strength potential, clay is considered to be a problematic soil in highway pavement. However, in many regions, clays constitute the main body of pavement subgrade. One traditional solution for the problem caused by the clays is their stabilization using additives. The main factors affecting on the selection of the type of additive is its effect on the physical and mechanical properties of the soil to achieve the objectives of the stabilization. This paper describes the results of an experimental study, in which the effects of three different stabilizers of lime, cement and CBR PLUS, which is a Nano polymer, on a type of clay soil have been investigated. Different amount of each stabilizers have been added to the soil, and the properties of Atterburg limits, compaction, California Bearing Ratio in dry and saturated conditions, uniaxial compressive strength and permeability of the stabilized soil have been evaluated. The results show that the CBR PLUS is more effective than the other stabilizers on the plasticity index and permeability. Also, it is found that the highest strength is achieved by cement, and the highest ratio of saturated to dry CBR is obtained by lime.

کلیدواژه‌ها [English]

  • lime
  • cement
  • Clay
  • CBR PLUS

مراجع

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  • تاریخ دریافت: 27 دی 1391
  • تاریخ پذیرش: 04 شهریور 1392

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