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Particle size is less than 1 micron with average diameter of 0.1 micron. The shape of the particle is spherical. It should be in Amorphous in nature. Fumed silica (CAS number 112945-52-5), also known as pyrogenic silica because it is produced in a flame, consists of microscopic droplets of amorphous silica fused into branched, chainlike, three-dimensional secondary particles which then agglomerate into tertiary particles. The resulting powder has an extremely low bulk density and high surface area.

Silica fume specific gravity

The specific gravity of silica fume is generally in the range of 2.2 to 2.3. The specific surface area of silica fume can be measured with the BET method or nitrogen adsorption method. The specific gravity of silica fume is 2.20–2.30 (Khan & Siddique, 2011; Tafraoui et al. 2016; Thomas, 2013).

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The quality is controlled and monitored throughout the entire production process to ensure that it meets or exceeds specification requirements. PROPERTIES State Amorphous - Sub-micron powder Color Gray to medium gray powder Specific Gravity 2.25 Solubility Insoluble Silica fume specific gravity is 2.2, which is somewhat lighter than portland cement, which includes a particular gravity of 3.15. Adding silica fume to concrete mix will not density the concrete. This expression means that silica fume isn’t a substance that is crystalline.

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(Note that the surface area of silica fume is not directly comparable to that of The carbon content of silica fume is affected by several aspects having to do with the manufacturing process, such as the use of wood chips versus coal, wood chip composition, furnace temperature, furnace exhaust temperature, and the kind of product (metal alloy) being produced.

Condensed silica fume is essentially silicon … Micro silica fume used in thermal … What is specific gravity – Answers.com. Specific gravity, usually referred to as relative density is the ratio of the mass of a given volume of a substance to the density of a different. Silica fume specific gravity is 2.2, which is somewhat lighter than Portland cement, which includes a particular gravity of 3.15. Adding silica fume to the concrete mixture will not density the concrete in terms of increasing the density of the concrete. This expression means that silica fume is not a substance that is crystalline.
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The specific gravity of silica fume used is 2.26. Silica and alumina constitutes around 80 to 85%. The presence of silica in greater percentage improves the microstructure of concrete. specific gravity of soil with increasing SF content due to the lower specific gravity value of silica fume (2.2). The relation of the dry unit weight with water content for different SF contents Silica fume is available in the following states (see Figure 6): As is bulk powder: Due to the low specific gravity of silica fume (~2.2), the bulk powder becomes very bulky and difficult to handle and transport. Silica fume is 100 times smaller than the average cement particle. Bulk density varies from 130 to 600 kg/m 3.
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Dispensing and Mixing: For concrete and wet shotcrete, The bulk density of silica fume depends on the degree of densification in the silo and varies from 130 (undensified) to 600 kg/m3. The specific gravity of silica fume is generally in the range of 2.2 to 2.3. The specific surface area of silica fume can be measured with the … Table — 3 Physical properties of silica fume Properties Values Specific gravity 2.5 Surface area, (kg/m2) 20,150 Bulk density, (kg/m3) 578 Table — 4 Chemical properties of silica fume Chemical properties (%) SiO 2 93.4 CaO 0.32 S 0.18 Na 2 O 0.38 Fe 2 O 3 0.60 K 2 0 … 3.1 Effect of silica fume and MIRHA on dry density Fig. 1 shows that incorporation of silica fume or MIRHA in cement paste decreases its dry density. For the same dosage, samples with MIRHA have lower dry density compared to samples with silica fume because the specific gravity of MIRHA is lower than silica fume. Specific gravity i)16mm-60% ii)10mm-40% 2.64 2.6-2.85 Fineness modulus 2.08 2.5- 6.5 Flakiness index 18.96% Not more than 30% Elongation index 24.64% Not more than 45% Bulk density 16.38 KN/ 1520 – 1680 KN/ Impact value 20.36% 30% 4.1.1 Properties of silica fume Table 4.4 Physical properties of silica fume Silica Fume Concrete Studies - A Progress Report 6.

Pozzolans will typically vary between 2.22 and 2.77 depending on the type of pozzolan (fly ash, GGBFS, silica fume) and its source. Pozzolan suppliers should readily be able to provide current values for their material.
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The properties of Silica fume is given in the Table 4. Table 4. Properties of Silica Fume Parameters Values Specific gravity 2.63 Density (gm/cc) 0.76 Moisture (%) 0.06 Silica as SiO 2 99.89 Alumina as Al 2 O 3 (%) 0.04 Fig.4 Silica Fume Property/Composition Cement Fly Ash Silica Fume Specific Gravity 3.15 2.00 to 2.05 2.2 Standard Consistency 29.00% – – Initial Setting time (Min) 165 – – Final Setting Time (Min) 245 – – Physical Form – Powder form Powder form Class – F – Chemical Composition Silicon Dioxide (SIO 2 ) 20.78% Min 35 90-96 % Aluminium Oxide ( Al Specific gravity Surface area (BET) (m.