کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7885442 | 1509757 | 2014 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Distinctive microstructural features of aged sodium silicate-activated slag concretes
ترجمه فارسی عنوان
ویژگی های ریز ساختاری خاصی از بتن های سرباره سدیم سیلیکات فعال در سنین
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی صنعتی و تولید
چکیده انگلیسی
Electron microscopic characterisation of 7-year old alkali-activated blast-furnace slag concretes enabled the identification of distinct microstructural features, providing insight into the mechanisms by which these materials evolve over time. Backscattered electron images show the formation of Liesegang-type ring formations, suggesting that the reaction at advanced age is likely to follow an Oswald supersaturation-nucleation-depletion cycle. Segregation of Ca-rich veins, related to the formation of Ca(OH)2, is observed in microcracked regions due to the ongoing reaction between the pore solution and available calcium from remnant slag grains. A highly dense and uniform interfacial transition zone is identified between siliceous aggregate particles and the alkali activated slag binders, across the concretes assessed. Alkali-activated slag concretes retain a highly dense and stable microstructure at advanced ages, where any microcracks induced at early ages seem to be partially closing, and the remnant slag grains continue reacting.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Research - Volume 65, November 2014, Pages 41-51
Journal: Cement and Concrete Research - Volume 65, November 2014, Pages 41-51
نویسندگان
Rackel San Nicolas, Susan A. Bernal, Ruby MejÃa de Gutiérrez, Jannie S.J. van Deventer, John L. Provis,