کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1457344 989255 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of HMEC on the consolidation of cement pastes: Isothermal calorimetry versus oscillatory rheometry
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
پیش نمایش صفحه اول مقاله
Effect of HMEC on the consolidation of cement pastes: Isothermal calorimetry versus oscillatory rheometry
چکیده انگلیسی

Chemical admixtures increase the rheological complexity of cement pastes owing to their chemical and physical interactions with particles, which affects cement hydration and agglomeration kinetics. Using oscillatory rheometry and isothermal calorimetry, this article shows that the cellulose ether HMEC (hydroxymethyl ethylcellulose), widely used as a viscosity modifying agent in self-compacting concretes and dry-set mortars, displayed a steric dispersant barrier effect during the first 2 h of hydration associated to a cement retarding nature, consequently reducing the setting speed. However, despite this stabilization effect, the polymer increased the cohesion strength when comparing cement particles with the same hydration degree.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Research - Volume 39, Issue 5, May 2009, Pages 440–445
نویسندگان
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