کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10155359 | 1666348 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
On the mechanism of prevention of explosive spalling in ultra-high performance concrete with polymer fibers
ترجمه فارسی عنوان
بر روی مکانیسم جلوگیری از انفجار مواد منفجره در بتن با عملکرد بالا با الیاف پلیمر
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کلمات کلیدی
اسپلینگ، بتن فوق العاده بالا، الیاف پلی پروپیلن، نفوذپذیری گاز، عدم هماهنگی حرارتی،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی صنعتی و تولید
چکیده انگلیسی
It has been a common practice to use polymer fibers to reduce susceptibility of explosive spalling in ultra-high performance concrete (UHPC). However, to-date, despite the proposition of different mechanisms through which polymer fibers enhance gas permeability and reduce explosive spalling, there are many unanswered questions and unjustified claims on the proposed mechanisms. Therefore, the major emphasis of this work is to thoroughly re-examine and understand the exact role of polymer fibers in the prevention of explosive spalling of UHPC. A range of analytical and microscopic tools are used to realize this objective. It is concluded that melting of polymer fibers and creation of empty channels are not required for enhancing the permeability of gases or water vapor through concrete. In fact, it is the thermal mismatch between embedded fibers and matrix that is critical in obtaining an interconnected network of cracks in the matrix. This occurs even before melting of polypropylene (PP) fibers. The network of cracks is responsible for enhancing permeability, thereby reducing the susceptibility of explosive spalling of UHPC.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Research - Volume 113, November 2018, Pages 169-177
Journal: Cement and Concrete Research - Volume 113, November 2018, Pages 169-177
نویسندگان
Dong Zhang, Aravind Dasari, Kang Hai Tan,