کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6723634 | 503603 | 2014 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Exploring the potential of siloxane surface modified nano-SiO2 to improve the Portland cement pastes hydration properties
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی عمران و سازه
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چکیده انگلیسی
This paper investigates the potential of siloxane surface modified nano-SiO2 as an admixture capable of modifying heat development and microstructure densification of Portland cement pastes. Two different types of siloxanes were grafted on nano-SiO2 (nS) particles. Calorimetric measurements of Portland cement pastes with 0.3 w/b ratio show that the siloxane functional group clearly interferes on the early age reactions of cement pastes with 0.1 or 0.5 by weight of functionalized nS. In situ soft X-ray transmission microscope images of nS/Ca(OH)2 solutions demonstrate that siloxane cover the nS surface and that the treatment allowed nS particles to last longer on a calcium hydroxide saturated solution before forming C-S-H. The possible reasons of this behavior are discussed, including the matrix densification and C-S-H nano-structure filling. The results indicate a potential use of this hybrid to improve the nanostructure of the cement paste matrix.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 54, 15 March 2014, Pages 99-105
Journal: Construction and Building Materials - Volume 54, 15 March 2014, Pages 99-105
نویسندگان
Giovana Collodetti, Philippe J.P. Gleize, Paulo J.M. Monteiro,