کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5468789 | 1519054 | 2016 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Pozzolanic reactivity of pure calcined clays
ترجمه فارسی عنوان
واکنش پذیری پوزولانیک از خاک رس کوارتز خالص
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
چکیده انگلیسی
Eight reference clay samples, 4 kaolinitic, 3 smectitic and 1 illitic clay, were purified and thermally treated in order to determine their pozzolanic reactivity in cementitious materials. The clays were calcined in a fixed-bed electrical furnace at temperatures ranging between 500 °C and 900 °C. Both raw and calcined clays were characterized by ICP-OES, XRD and BET techniques. Their pozzolanic reactivity was evaluated with clay-lime pastes after 3, 7, 14, 28, 56 and 90 days using thermogravimetry (TGA). The results indicate that all kaolinitic clays are highly reactive at a broad range of firing temperatures (500-900 °C). The degree of ordering of the raw kaolinite influences the optimal activation temperature and the rate of the calcined clay-lime reaction. The smectitic clays possess a clear optimal calcination temperature of 800 °C. Ca-rich smectites are proven to be somewhat more reactive than Na-rich smectites. However, even at 800 °C, its reactivity is significantly smaller compared to kaolinite. Hectorite and illite calcined at an optimal temperature of 800 and 900 °C, respectively, exhibit poor pozzolanic reactivity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Clay Science - Volumes 132â133, November 2016, Pages 552-560
Journal: Applied Clay Science - Volumes 132â133, November 2016, Pages 552-560
نویسندگان
Sofie Hollanders, Rieko Adriaens, Jørgen Skibsted, Ãzlem Cizer, Jan Elsen,