Silica Fume

Silica Fume is a high performance, densified silica fume powdered product, derived as a by-product of producing silicon metal or ferrosilicon alloys. Used in pre-mixed concrete for enhancing mechanical properties of concretes with special performance requirements, including increased strength, reduced permeability, improved abrasion resistance and increased corrosion resistance.

Silica fume is consists of very fine particles. Its extreme fineness and high silica content, silica fume is a highly effective pozzolanic material. Being a highly reactive pozzolan, silica fume chemically reacts with the calcium hydroxide present in the cement paste, creating a stronger calcium silica hydrate 'making it sticky'. The result is improved paste to aggregate bond (excellent for shotcrete) and higher concrete strengths. Silica Fume is typically grey in colour and is categorised as a supplementary cementitious material (SCM).

Special Features:

• Increase compressive strength
• Reduces chloride ion permeability
• Increase abrasion resistance
• Enhanced sulphate resistance
• Improved durability
• Enhanced resistance to chemical attack and deterioration
• Increase bond strength