کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
672730 | 1459453 | 2016 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Characterization of early-age hydration processes in lime-ceramic binders using isothermal calorimetry, X-ray diffraction and scanning electron microscopy
ترجمه فارسی عنوان
تشخیص پروسه های هیدراتاسیون زودرس در باند آهک-سرامیک با استفاده از کولوریمتری ایزوترمال، پراش اشعه ایکس و میکروسکوپ الکترونی اسکن
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کلمات کلیدی
آهک سرامیکی، هیدراتاسیون در سنین اولیه، کالریمتری ایزوترمال، پراش اشعه ایکس، میکروسکوپ الکترونی اسکن، ویژگی های مکانیکی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Early-age hydration processes in a lime-ceramic-water system are analyzed within the whole range of possible lime/ceramic ratios. The isothermal calorimetry shows a substantial effect of the heat of wetting on the total heat evolved, ranging from 10Â J/g for lime to 3.9Â J/g for ceramic. The highest specific hydration heat of 63Â J/g during the analyzed 300-h hydration period exhibits the blended binder containing 70% ceramic and 30% lime which correlates well with the highest compressive and bending strengths of the paste prepared using this blend. Portlandite, ettringite and calcite are the main phases identified by the X-ray diffraction analysis after the hydration of ceramic-rich blends. According to the results of scanning electron microscopy, the initial course of pozzolanic reaction is for this type of binders characterized by the transition from tobermorite-like calcium-silicate-hydrate structures into jennite-like structures within the first 48Â h. Blends with the ceramic content lower than 70% show a high portion of portlandite, calcite is present in low amount, and the jennite-like structures are observed after 48Â h, following the initial formation of components with a very high Ca content. The favorable properties of the ceramic-rich blended binders can be explained by the partial hydraulic character of the ceramic. With the specific hydration heat of 29Â J/g after 300Â h and compressive strength of the paste 2.8Â MPa after 30Â days, the applied waste ceramic dust from the hollow brick production has good prerequisites for the application in lime-based binders with satisfactory engineering properties and good economical parameters for the building practice.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 633, 10 June 2016, Pages 108-115
Journal: Thermochimica Acta - Volume 633, 10 June 2016, Pages 108-115
نویسندگان
MiloÅ¡ Jerman, Vratislav Tydlitát, Martin Keppert, Monika Äáchová, Robert Äerný,