کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7884992 1509734 2016 19 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Parameters controlling early age hydration of cement pastes containing accelerators for sprayed concrete
ترجمه فارسی عنوان
پارامترهای کنترل هیدراتاسیون سنین اولیه سیمان حاوی شتاب دهنده برای بتن اسپری
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
چکیده انگلیسی
The objective of this work is to parametrize the early age hydration behavior of accelerated cement pastes based on the chemical properties of cement and accelerators. Eight cements, three alkali-free and one alkaline accelerators were evaluated. Isothermal calorimetry, in situ XRD and SEM imaging were performed to characterize kinetics and mechanisms of hydration and the microstructure development. The reactivity of all accelerators is directly proportional to their aluminum and sulfate concentrations and to the amount and solubility of the setting regulator contained in cement. Alite hydration is enhanced if a proper C3A/SO3 ratio (between 0.67 and 0.90) remains after accelerator addition and if limestone filler is employed, because undersulfated C3A reactions are avoided. Combinations of compatible materials are recommended to enhance the performance of the matrix and to prevent an undesirable hydration behavior and its consequences in mechanical strength development.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Research - Volume 89, November 2016, Pages 230-248
نویسندگان
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