کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
256612 503557 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Characterization of alkali activated slag–fly ash blends containing nano-silica
ترجمه فارسی عنوان
خصوصیات اسلاجی فعال قلیایی مخلوط خاکستر متخلخل حاوی نانوسیلیکا است
کلمات کلیدی
فعال سازی قلیایی رفتار تازه، مخلوط شن و ماسه خاکستر، نانو سیلیکا، سینتیک واکنش قطر بینی، قدرت فشاری
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی


• The nano-silica addition reduces the flowability and slightly retards the early age reaction.
• The gel structure remains stable regardless of nano-silica content and slag/fly ash ratio.
• The addition of nano-silica slightly increases the chemically bound water content.
• A nano-silica content of around 2% presents the optimum strength and porosity.

Applying nano-technology/modifications in construction and building materials has shown inspiring results. This paper investigates the effects of nano-silica incorporation on an eco-friendly alkali activated slag–fly ash blends. The fresh behaviors, reaction kinetics, gel structure, porosity and strength of samples with different nano-silica contents and slag/fly ash ratios are analyzed. The results indicate that as the nano-silica content increases, the slump flow is significantly reduced, and the reaction process is slightly retarded according to the setting time and isothermal calorimetry results. The microstructure analysis carried out by FTIR and TG/DSC shows that the addition of nano-silica slightly increases the chemically bound water content. The main reaction product is a chain structured C-A-S-H type gel, regardless of the slag/fly ash ratio and nano-silica content. Increasing the nano-silica content up to around 2% benefits the compressive strength and contributes to a reduced porosity, but further higher nano-silica contents show a negative effect on the strength and the pore refinement becomes less significant. It is suggested that the nano-silica benefits the microstructure and strength by providing additional reactive silica source and the filler effect. Furthermore, the slag content exhibits a dominant role on setting times, early age reaction, compressive strength and porosity in this blended alkali system.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 98, 15 November 2015, Pages 397–406
نویسندگان
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