کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6712107 | 1428723 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Controlling workability in alkali-activated Class C fly ash
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی عمران و سازه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Alkali-activation of Class C fly ashes can produce Portland cement-free binders that take advantage of sodium aluminosilicate hydrate (N-A-S-H) and aluminum-substituted calcium silicate hydrate (C-A-S-H) phases for strength development. However, alkali-activated Class C fly ashes suffer from poor workability and rapid setting; traditional water-reducing admixtures are not effective. In this study, different methods to modify the workability of alkali-activated Class C fly ash mixtures were investigated. Retarders decreased the mixture stiffness and delayed setting, but strength development suffered. Increasing mixing intensity slightly improved workability without significantly impacting strength. Controlling silica modulus significantly improved workability, but the impact on strength was inconsistent.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 183, 20 September 2018, Pages 226-233
Journal: Construction and Building Materials - Volume 183, 20 September 2018, Pages 226-233
نویسندگان
Watanyoo Rakngan, Trevor Williamson, Raissa D. Ferron, Gaurav Sant, Maria C.G. Juenger,