کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5454551 | 1514354 | 2017 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Investigating the pore structure of the calcium silicate hydrate phase
ترجمه فارسی عنوان
بررسی ساختار منافذ فاز هیدرات سیلیکات کلسیم
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
چکیده انگلیسی
The physical properties of the calcium silicate hydrate phase (C-S-H) greatly impact material strength and durability of cement-based materials. However, despite its widespread use and influence on material stability, there is still debate concerning its nanostructure. In this paper, the pore structure of C-S-H was characterized by analyzing focused ion beam prepared lamellas from a model tricalcium silicate clinker cement paste using scanning transmission electron microscopy (STEM) performed with a scanning electron microscope (SEM) for measurements at 30Â keV and a transmission electron microscope (TEM) operating at low primary electrons energy (80Â keV). The composition was mapped in the SEM using energy-dispersive X-ray spectroscopy (EDX). These investigations were accompanied by argon adsorption measurements using non-local density functional theory (NLDFT) models to calculate the pore size distribution. Mercury intrusion porosimetry (MIP) was used to investigate macropores. The STEM investigations performed at 30 and 80Â keV both reveal a sponge-like pore structure built up by 0.7-4.0Â nm thin C-S-H foils. The pore sizes range between 2 and 10Â nm with a dominance of 5Â nm wide pores. These results are in line with the pore size distribution determined with argon adsorption, which predominantly found 4.6Â nm wide pores. The similar pore width distributions in STEM and gas adsorption validates the gas adsorption measurements and points towards minimal electron beam damage occurring during observation and analysis.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 133, November 2017, Pages 133-137
Journal: Materials Characterization - Volume 133, November 2017, Pages 133-137
نویسندگان
Olivia Wenzel, Matthias Schwotzer, Erich Müller, Venkata Sai Kiran Chakravadhanula, Torsten Scherer, Andreas Gerdes,