کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6711412 1428719 2018 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Acoustic Emission behavior of thermally damaged Self-Compacting High Strength Fiber Reinforced Concrete
ترجمه فارسی عنوان
رفتار انتشار آکوستیک بتن مسلح با مقاومت بالا فشرده سازی شده با گرما آسیب دیده است
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی
This paper investigates the effect of high temperature on two different Self-Compacting (SC) cementitious composites. SC-High Strength (SCHSC) and Fiber-Reinforced Concrete (SCHSFRC) samples were tested in three-point bending after having been exposed to high temperature at 300 and 600 °C. Besides the conventional force-displacement response, Acoustic Emission (AE) activity was monitored during the bending tests with the aim to investigate the possible correlation between the fracture behavior, the rate of AEs and the influence of high temperature exposure. The tests clearly pointed out the effects of heat exposure. More specifically, SCHSC specimens showed a significant decay in mechanical properties as a result of thermal treatments. Then, a lower degradation was observed for the SCHSFRC after heat exposure at 300 °C, whereas the specimens exposed to 600 °C exhibited a tougher response than the corresponding SCHSC. The results showed that the effect of fibers played a beneficial role in bridging the expansion of heat-induced cracks developed in the concrete matrix during the exposure of specimens at high temperature. This bridging effect of fibers was observed also in terms of the AE activity: much less AE events were systematically registered for SCHSFRC specimens with respect to SCHSC ones, for a given value of the imposed Crack-Mouth-Opening-Displacement (CMOD). Therefore, AE measurements confirm their potential in scrutinizing the damage level in cementitious composites.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 187, 30 October 2018, Pages 519-530
نویسندگان
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