کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1455510 989049 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Carboxylates and sulfates of polysaccharides for controlled internal water release during cement hydration
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
پیش نمایش صفحه اول مقاله
Carboxylates and sulfates of polysaccharides for controlled internal water release during cement hydration
چکیده انگلیسی

Calcium and aluminium carboxylates and sulfates of polysaccharides form hydrogels. Four Al- and three Ca-salt hydrogels of such polysaccharides, which were found to be stable enough to be mixed into fresh Portland cement pastes of low initial water-to-cement ratio of 0.275, were compared with respect to their water retardation potential using non-destructively operating low-field 1H NMR relaxometry. All of the investigated hydrogels release their water to the cement mainly during the accelerated period of cement hydration. At a degree of hydration of about 0.7 the water in the hydrogels is consumed completely by the hydration reactions. Based on Powers’ hydration model the development of the volumetric phase distribution of the investigated hydrating cement with internal curing by the hydrogels was quantified. Within the hardening cement the Ca-salt hydrogels are more stable than the Al-hydrogels which is concluded from the changes of the T2 relaxation times during the cement hydration.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Composites - Volume 31, Issue 4, April 2009, Pages 244–249
نویسندگان
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