کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8906396 1634410 2018 36 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of freeze-thaw cycles on mechanical properties of polypropylene Fiber and cement stabilized clay
ترجمه فارسی عنوان
اثر چرخه یخ زدایی بر خصوصیات مکانیکی پلی اتیلن پلیمر و سیمان تثبیت شده رس
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
چکیده انگلیسی
To investigate the effects of fiber, cement and freeze-thaw cycles on the cement-treated clay and fiber and cement stabilized clay, a series of freeze-thaw tests with no water supply condition were conducted on the stabilized soil after standard curing for 7 days subsequently, and then the unconfined compression tests were carried out. The dimension change ratio, stress-strain relationship curves, post-peak stress ratio, tangent modulus and unconfined compressive strength (UCS) were obtained and analyzed in terms of the number of freeze-thaw cycles, cement, and fiber contents. Results show that cement-treated soil exhibits volumetric shrinkage behavior, and the dimension shrinkage ratio increases with increasing cement content and freeze-thaw cycles. A majority of fiber and cement stabilized soil specimens present volumetric expansive behavior, and the dimension expansive ratio increases with increasing fiber content and freeze-thaw cycles. Stress-strain curves for soils subjected to freeze-thaw cycles exhibit an initial flexible stage, and a greater post-peak stress was observed on fiber-stabilized soils than cement-treated soils due to the ductile behavior of fiber. Tangent modulus increases with increasing cement content and decreases with increasing fiber content, and drops sharply by 43%~72% after one freeze-thaw cycle. Unconfined compressive strength increases obviously with increasing cement content, decreases sharply after the first few freeze-thaw cycles, then exhibits little change after five freeze-thaw cycles. The UCS reduction ratio ranges from 42% to 69% after ten freeze-thaw cycles. The addition of polypropylene fiber shows an improvement in UCS and exhibits higher UCS at fiber content of 0.20%. Finally, an empirical model for predicting UCS was proposed by considering the effects of cement content, fiber content and numbers of freeze-thaw cycles, and the predicted UCS show a good agreement with test results.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cold Regions Science and Technology - Volume 154, October 2018, Pages 155-165
نویسندگان
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