کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4918334 1428756 2017 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Shrinkage and strength development of alkali-activated fly ash-slag binary cements
ترجمه فارسی عنوان
تولید انبساط و قدرت سیمان بتنی دارای ذرات خاکستر فعال قلیایی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی
This paper evaluates the effect of fly ash and slag proportions and the type of activating solution on shrinkage and strength development of alkali-activated binary fly ash-slag mixtures (mortar and paste), cured at room temperature. Three different volumetric ratios of slag/fly ash were considered: 10%, 15%, and 20%. Two activators with different pH and modulus, n = (SiO2/Na2O)mol were utilized. The liquid to solid volume ratio of all binders was maintained at 0.75. The results showed that while the addition of slag significantly shortens the time of setting (up to 178 min), and increases the compressive strength (up to 93%) and bulk modulus (up to 43%), it also results in higher autogenous shrinkage, but smaller mass loss during drying. Measured drying shrinkage of mixtures with various slag contents was similar, likely due to counteracting effects of binder stiffness and degree of saturation. Fly ash-slag binders activated at higher pH exhibited larger chemical shrinkage, but lower autogenous (up to 21%) and drying shrinkage (up to 47%) magnitude.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 150, 30 September 2017, Pages 808-816
نویسندگان
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