کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10128640 | 1645141 | 2018 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Pore structure refinement of cement paste incorporating nanosilica: Study with dual beam scanning electron microscopy/focused ion beam (SEM/FIB)
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
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چکیده انگلیسی
Pozzolanic materials, micro- and nano-, have been found to improve the durability properties of cement-based materials by refining their pore structure. As a relatively newer material, the modifying effects of nanosilica on pore structure are still inconclusive in the literature. In this study, this was characterized by implementing dual beam SEM/FIB, which can generate 3D models of porous materials for quantitative analysis. The sample is milled by focused ion beam layer-by-layer, and each surface layer is 2D imaged via scanning electron microscopy. Three types of pores - large capillary pore, medium capillary pore and gel pore - can be observed. A 3D pore structure model is then reconstructed from 1000 of these 2D images, from which porosity and pore size distribution can be calculated. Cement pastes incorporating nanosilica and silica fume were compared. The porosity and pore diameter were found to decrease with the inclusion of nanosilica. Furthermore, reduction in capillary pores and subsequent increase in gel pores were also observed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 145, November 2018, Pages 323-328
Journal: Materials Characterization - Volume 145, November 2018, Pages 323-328
نویسندگان
Seungmin Lim, Han-Seung Lee, Shiho Kawashima,