کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1456740 989221 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Pozzolanic behaviour of compound-activated red mud-coal gangue mixture
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
پیش نمایش صفحه اول مقاله
Pozzolanic behaviour of compound-activated red mud-coal gangue mixture
چکیده انگلیسی

The pozzolanic behaviour of compound-activated red mud-coal gangue has been investigated through TG, DTA, XRD, FTIR and 27Al MAS NMR. From viewpoint of reaction kinetics, it is found that the pozzolanic reaction mechanism of the compound-activated red mud-coal gangue — lime system is clearly consistent with diffusion control up to 14 days, and the reaction rate constant calculated from Jander equation decreases with the increase of CaO addition in the system. The hydration products formed in the red mud-coal gangue — lime systems at ambient temperature are essentially aluminous C–S–H and Ca3Al2O6.xH2O. From TG analysis results, it is thought that the high amount of Ca(OH)2 in the pastes of studied system is not conducive to the continual increase of non-evaporable water content of the hydration products. Of particular interest, 27Al MAS NMR proved to be an effective technique to obtain valuable information of Al[4] in C–S–H and Al[6] in Ca3Al2O6.xH2O.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Research - Volume 41, Issue 3, March 2011, Pages 270–278
نویسندگان
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