Composition
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Condensed silica fume consists primarily of pure silica in non-crystalline form and contains more than 90% silicon dioxide (Detwiler et al., 1996). Small amounts of magnesium, iron, and alkali oxides are also present. Most particles are smaller than 1 mm with an average diameter of 0.1 mm. ASTM C 1240 limits the percent retained on the 45-mm sieve to 10%, the moisture content to 3%, and the loss on ignition (LOI) to 6%.
Replacement
Condensed silica fume is used as a replacement for portland cement. Silica fume can replace portland cement in the range of 9-15% by mass of cement.
Advantages
Using silica fume concrete creates the following advantages:
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Since it has a high surface area, condensed silica fume increases the amount of water needed in the mixture, so it is recommended to use it along with a high-range water-reducing admixture. The condensed silica fume/portland cement mixture must be protected for the first 7 days from drying shrinkage. To optimize the benefits resulting from the use of condensed silica fume, it must be thoroughly dispersed in the cement mixture. A disadvantage to utilizing silica fume in cement is the cost. Condensed silica fume costs from $400-$1,000/ton, which is significantly higher than portland cement ($90/ton). When using this or any other alternative cementing material with portland cement, it is necessary to create trial mixtures to ensure proper proportioning for the desired properties.
References
Chemicals are used in daily life. Micro Silica Fume Price and
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products are commonly for chemical use. A few examples, detergents are products that contain an active substance called surfactants or surface active material. Another industry for chemical usage is Clothing. Textiles used for making clothes are sometimes finished by chemical processes to enhance their characteristics. Besides, there are essential for Fragrances, Insecticides, Paints and so onAre you interested in learning more about 85% Densified Silica Fume? Contact us today to secure an expert consultation!