کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7884076 1509647 2018 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Distinguishing dynamic and static yield stress of fresh cement mortars through thixotropy
ترجمه فارسی عنوان
تعیین استحکام عملکرد پویا و استاتیک ملات تازه سیمان از طریق تیکستروپلی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
چکیده انگلیسی
The dynamic and static yield stress of fresh cement mortar were measured in a rotational rheometer with a vane geometry using shear rate and shear stress-controlled protocols, respectively. Through a shear rate-controlled steady-state protocol, the equilibrium flow curve is measured and fitted with the Bingham model to obtain dynamic yield stress. A negative slope in the equilibrium flow curve, shear banding and stick-slip phenomena are observed and discussed. Through a stress-controlled creep-recovery protocol, viscosity bifurcation behavior is captured and static yield stress is marked as the creep stress when the bifurcation occurs. Finally, the discrepancy between dynamic and static yield stress is tied to thixotropy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Composites - Volume 86, February 2018, Pages 288-296
نویسندگان
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