بررسی اثر سوپرجاذب بر روی رفتار تراکمی خاک با استفاده از آزمایش فشردگی محصور

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی بیوسیستم دانشکده کشاورزی دانشگاه بوعلی سینا همدان

2 گروه مهندسی بیوسیستم، دانشکده کشاورزی، دانشگاه بوعلی سینای همدان، همدان، ایران

چکیده

اصلاح و بهسازی خاک‌ها به‌عنوان امری اجتناب ناپذیر نقش مهمی در کشاورزی دارد و اجرای روش‌های نوین خاک‌ورزی و افزودن برخی از مواد افزودنی نظیر سوپرجاذب، به‌منظور استفاده بهینه از آب در کشاورزی دیم برای افزایش عملکرد محصولات زراعی از اهمیت ویژه‌ای برخوردار است. پلیمرهای سوپرجاذب ترکیباتی آلی هستند که قادرند تا چندین برابر حجم یا وزن خود آب جذب کنند بدون آن که ساختار فیزیکی آن‌ها تغییر کند. هدف از این تحقیق بررسی تنش پیش-تراکمی به‌عنوان معیاری از مقاومت به تراکم خاک در حضور پلیمرهای سوپرجاذب است. در این پژوهش، تنش پیش-تراکمی با استفاده از آزمایش فشردگی محصور(CCT) تعیین گردید. آزمایش فاکتوریل در قالب طرح کاملا تصادفی و با سه تکرار روی نمونه‌های با رطوبت 15 % و 10 % و چگالی4/1، 5/1 و 6/1 در پنج سطح 0، 1، 2، 3 و 4 گرم پلیمر در هر کیلو‌گرم خاک انجام گرفت. نتایج آزمایشات نشان داد که با افزایش مقدار سوپرجاذب، تنش پیش-تراکمی و شاخص تراکم افزایش یافته و بیشترین مقدار تاثیرگذاری سوپرجاذب در سه درصد وزنی آن است که رطوبت مناسب برای زراعت را ایجاد می‌کند. در هر دو رطوبت 10 و 15 درصد بیشترین تنش پیش-تراکمی معادل 8/2 بود.

کلیدواژه‌ها


عنوان مقاله [English]

Investigating the Effect of Superabsorbent on Compaction Behavior of Soil using Confined Compression Test

نویسندگان [English]

  • Nazanin Sharifi 1
  • mojtaba jaberimoeaz 2
1 Department of Bio-System Engineering Faculty of Agriculture, University of Bu-Ali Sina, Hamadan, Iran
2 Department of Biosystems Engineering, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran
چکیده [English]

Agricultural soils improvement and amendment has an inevitable importance. The implementation of new tillage methods and using some additives such as superabsorbent, in order to optimally use of water in rainfed farms to increase the yield of crops, has particular importance in this relation. Superabsorbent polymers are organic compounds that are able to absorb water several times of their own volume or weight without changing their physical structure. The purpose of this research is to investigate pre-compaction stress as a measure of resistance of soil compaction in the presence of superabsorbent polymers. In this research, the pre-compaction stress was determined using the confined compression test (CCT). The factorial experiment was carried out in the form of a completely random design with three replications on the samples with humidity of 15% and 10% and density of 1.4, 1.5 and 1.6 at five levels of 0, 1, 2, 3 and 4 grams of polymer per kilogram of soil. The results of the tests showed that with the increase in the amount of superabsorbent, pre-compaction stress and compaction index increased. The maximum effective amount of superabsorbent is three percent by weight, which creates moisture suitable for agricultural products. In both humidity of 10 and 15%, the highest pre-compaction stress was equal to 2.8.

کلیدواژه‌ها [English]

  • Soil compaction
  • Confined compression test
  • pre-compaction stress
  • superabsorbent
  • density index
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