INTRODUCTION
Today, Silica Fume is common for the production of concrete for large permanent structures, especially in aggressive environments, are exposed, as the structures of marine sciences.
It combines with Ordinary Portland Cement OPC (or Portland cement ASTM C150 Type I) as a substitute for sulphate resistant cement (Type V cement ASTM C150) in the production of sulfate resistance of concrete.
PRODUCTION
Silica fume is a byproduct of the silicone and reinforced concreteSilicone industry.
It arises from the reduction of quartize on silicon with high quality coal in an electric arc furnace.
Ovens revolve slowly on carbon electrodes. These create arc deep into the oven and then the high temperature required to produce, for fused silica.
The gas and air drawn in over the stove out from the fans some of the filter fabric. The decrease in silica fume in the filter and sent to the silos.
Particles of silica fume mediaSize is 0.1 microns. These particles are then 100 times thinner than a grain of cement.
Blowing air through the smoke of silica in the silo, the particles will affect the other particles and keep them from the forces of surface. This is basically the compression ratio for the production of densified silica fume, much more practical and easy to use in concrete.
TECHNICAL DATA FOR USE IN HIGH DURABLE CONCRETE:
The requirements for use in concrete are allocated generally in the form of:
SiO2 content:indicated by 85%
SiO3 content: maximum 1%
Loss on ignition: maximum of 6%
Humidity: 3%
The minimum wage SiO2 helps reduce the amount of pollutants and contaminants in the silica fume. The SiO 3 is limited for expansion, limiting the formation of Ettringite al. Moisture content of Silica Fume living conditions of the furnace is negligible in general. The limit of 3% is generous and will probably be of poor preservation. The standard specification for use inHydraulic cement concrete and the ASTM C1240.
ADVANTAGES OF USE FOR construction
The material was used throughout the world for many years in the area where a high strength and durable concrete have been applied.
Know-how to the production of concrete is essential still. Simply state must have a consistency of fresh concrete, so they are transported, can be made available and compact construction equipment, without separation. Use in combination with superplasticiser (for improvementwas the dispersion of cement and thus reduce significantly the demand for water supplied) is known worldwide for producing high quality cement. This will help to improve the properties of both fresh and hard concrete.
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