اثر نانو مواد +CBR بر مقاومت مکانیکی و خواص شیمیایی رواناب جاده جنگلی

نوع مقاله: علمی - پژوهشی

نویسندگان

1 دانشیار، گروه جنگلداری، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران.

2 کارشناس ارشد مهندسی جنگل، شرکت نکا چوب، ساری، ایران.

3 استادیار، گروه جنگلداری، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران.

4 دانشجوی دکترای مهندسی جنگل، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران.

چکیده

در این پژوهش نانو­پلیمر سی­بی­آر پلاس (CBR+) برای تثبیت خاک جادة جنگلی مورد بررسی قرار گرفت. آزمایش­های تعیین بافت، حدودآتربرگ، تراکم و سی­بی­آر (CBR) بر روی نمونة خاک شاهد و تیمارشده با درصدهای وزنی 25/0 درصد، 50/0 درصد، 75/0 درصد و یک درصد بر روی کرت­ها انجام­ شد. برای بررسی وضعیت مکانیکی مصالح لایه روسازی پنج کرت شامل یک کرت شاهد (بدون نانوپلیمر) و چهار کرت نمونه بر روی جاده پیاده شد. نتایج نشان داد مادۀ پلیمری سبب کاهش حدود روانی و خمیری شده است. در منحنی دانه­بندی نمونه­های شاهد و تیمار، با افزایش درصد مادة افزودنی سی­بی­آر  پلاس از مقدار عناصر ریزدانه خاک کاسته ­شد. به‌طوری‌که تیمار یک­درصد دارای کمترین درصد وزنی ریزدانه و بیشترین درصد وزنی درشت‌دانه در مقایسه با دیگر تیمارها بود. همچنین تیمار موردنظر موجب کاهش رطوبت بهینه و افزایش حداکثر دانسیتۀ خشک و ظرفیت باربری می­شود. نتایج حاصل از بررسی خواص شیمیایی نشان­دهندة افزایش مقدار پتاسیم، کلسیم و منیزیم در رواناب حاصله بوده است.نتایج این پژوهش نشان داد که تیمار یک­درصد نانو پلیمر سی­بی­آر پلاس در مقایسه با دیگر تیمارها عملکرد بهتری را به نمایش گذاشت.

کلیدواژه‌ها


عنوان مقاله [English]

Effects of CBR+ nano materials on mechanical resistance and chemical characteristics of forest roads runoff

نویسندگان [English]

  • Majid Lotfalian 1
  • Amir Savadkoohi 2
  • Aidin Parsakhoo 3
  • Somayeh Karamirad 4
1 Associate Professor, Department of Forestry, Department of Natural Resources, University of Agricultural Sciences and Natural Resources, Sari, I. R. Iran.
2 M.Sc. of Natural Resources Engineering, Nekachoob Company, Sari, I. R. Iran.
3 Assistant Professor, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, I. R. Iran.
4 PhD Student of Forest Engineering, Faculty of Natural Resources, University of Agricultural Sciences and Natural Resources, Sari, I. R. Iran.
چکیده [English]

In this study, Nano-polymer CBR PLUS is sued for soil stabilization in forest roads. Tests were carried out to identify the texture, Atterberg limits, compaction and CBR on the control and treated soil samples with different percentage of 0.25%, 0.50%, 0.75% and 1%. In order to study the mechanical characteristics of upper layer, five plots including one control plot (untreated) and four sample plots were carried out on forest road. The results showed that the Nano-polymer reduced liquid and plastic limits. By increasing the percentage of CBR PLUS, the soil fine particles decreased in control and treated samples, in which that 1% treatment has the minimum content in weight percent of soil fine particles and maximum content in coarse particles compare to other treatments. Also soil treated with CBR PLUS, reduces the optimum moisture content and increases maximum dry density and California Bearing Capacity (CBR). Investigation of chemical properties showed that the amount of Calcium, Magnesium and Potassium increased in runoff. It was concluded that 1% of Nano-polymer CBR PLUS acted better in comparison with other treatments.

کلیدواژه‌ها [English]

  • Atterberg limits
  • BR
  • Nano polymer
  • Runoff C
  • Soil compaction
  • Soil stabilization
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