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P·Ⅱ 52.5 cement, fly ash, silica fume, metakaolin are treated as cementitious materials in this study, and their chemical compositions are shown in Table 1.The Scanning electron microscopy (SEM) pictures of used silica fume and metakaolin are presented in Fig. 1.
Mineral Admixtures – ScienceDirect
Mineral admixtures are incorporated in Portland-cement mortar andconcrete, either in the form of blended cements, such as portland pozzolan or portland blast furnace slag cements, or directly added as admixtures to the concrete at the time of mixing.
Nitish+chalhotra(800922007) (1) – SlideShare
Silica fume is an ultra fine powder, with individual particle sizes between 50 and 100 times finer than cement, comprising solid spherical glassy particles of amorphous silica (85-96 percent SiO2). However, the spherical particles are usually agglomerated so that the effective particle size is much coarser.
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Proceedings 003 – Rilem
Fly ash, silica fume and quartz powder were used as additives. The cement pastes were sealed and stored at 20°C. The investigations included thermogravimetric analysis, chemical analysis of the hardened cement paste and the pore solution, mercury intrusion porosimetry and differential scanning calorimetry.
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A student of the first author once early pozzolanic reaction of silica fume that creates a barrier requested a contractor to supply him with a 32 MPa concrete between the ‘still not totally hydrated’ cement particles [21]. for a research that needed a large pour.
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Fly Ash Pollutants, Treatment and Recycling | SpringerLink
Because ash with a silica content of >50 wt% can be used as a substitute source for silica in the manufacturing process of a silicate glass (Park et al. 2009), or as constituent in the cement production (Girón et al. 2013) the silica content is the most evaluated component of FA from biomass.
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In this study, RHA plays a role as a highly active fine mineral additives, containing 88.42% amorphous SiO 2 oxide in component. The combination of RHA and superplasticizer ACE 388 as mineral additives is able to modify the concrete structure.
2013 Annual Meeting: Author Index H – AIChE
532e Highly Active and Stable Silica-Doped, … 741e Analysis of Supply … 120h Predicting Bulk Scale Properties of Surface Modified Fine Powders From Particle Scale …
Proceedings: Symposium on Control of Fine Particulate …
The problem, of fine particulates is intensified by the tendency of metallic materials, some of which are chemically and catalytically highly active, to condense as fine particulates from high temperature processes, such as combustion and pyrometallurgical processes.
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2013 Annual Meeting: Author Index C – AIChE
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Metakaolin in the formulation of UHPC | Request PDF
Silica fumes have characteristics that make them exceptional in cement matrices and, in particular, in UHPC. Nevertheless, they have important disadvantages: lack of availability, cost and color.
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Edge-oriented WS2 nanosheets anchored on laser-textured microcone arrays constitute an open and porous framework for highly exposing active edge sites. … sub-micro particles of 0.5–1 μm, fine …
