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Anyang Lishi - Silica Fume
Silica fume, also known asmicro silica, is a by-product of the production of ferrosilicon or silicon(silicon metal) industrial. Silica fume is an amorphous silicon dioxide(SiO2) generated as a gas in submerged electrical arc furnaces during the reduction of quartz. The whole process needs to be recycled with a dust-removing protection facility. The individual micro silica particles are extremely small, approximately 1/100th the size of an average cement particle. Due to its fine particles, large surface area, and high SiO2 content, silica fume is a very reactive pozzolan used in concrete. The quality of silica fume is specified by ASTM C 1240 and AASHTO M 307.
- Very Stable Chemical and Physical Properties
- Increased compressive strength
- Reduced water permeability
- Increased Thermal Conductivity
- Improved abrasion resistance
- Enhanced durability
- Increased toughness
- Reduced efflorescence
Because of construction materials, silica fume can fill the pores between cement and concrete particles, form a gel with hydration products, and react with basic material magnesium oxide to form a gel.
Silica fume also can greatly improve the strength and density of concrete, Microsilica is widely used in refractory, concrete, industrial floor, dry powder mortar (or dry mixed mortar), grouting material, cementing wellhead, external wall insulation, and other industries.
The content of silica fume is generally 5% to 10% of cementitious material.
The mixing method of micro-silica is divided into internal mixing and external mixing.
- Internal admixture: under the premise of constant water consumption, 1 phr silica fume can replace 3-5 phr cement (weight) and keep the compressive strength of concrete unchanged, so as to improve other properties of concrete.
- External mixing: the strength and other properties of concrete can be significantly improved by adding silica fume. When concrete is mixed with silica fume, there is a certain slump loss. Silica fume must be combined with water reducing agent. It is suggested to mix fly ash and ground slag to improve its constructability.