What are the two main functions of silica fume in concrete?

Silica fume is added to Portland cement concrete to improve its properties, in particular its compressive strength, bond strength, and abrasion resistance.

Which industry produces silica fume?

Silica fume, a by-product of the ferrosilicon industry, is a highly pozzolanic material that is used to enhance mechanical and durability properties of concrete.

What is the use of microsilica in concrete?

Microsilica or silica fume is an excellent admixture for concrete as it leads to better engineering properties. It reduces thermal cracking, improves durability, and increases strength. Silica fume concrete has a number of construction applications.

What are the advantages of using silica fume in concrete?

Advantages of Using Silica Fume

• High early compressive strength.
• High tensile flexural strength and modulus of elasticity.
• Very low permeability to chloride and water intrusion.
• Enhanced durability.
• Increased toughness.
• Increased abrasion resistance on decks, floors, overlays and marine structures.

What is the advantage of using silica fumes in manufacturing of concrete?

Due to the filling effect of silica fume, the moisture in concrete decreases and local dry shrinkage cracks are caused. Therefore, strengthening concrete maintenance after construction can effectively alleviate the problem. If the external temperature is too high, it will cause the dry shrinkage of concrete surface.

How silica fume is used in concrete?

9 – Use of silica fume in concrete Condensed silica fume is a very fine, amorphous, and reactive mineral admixture. It reacts readily with the calcium hydroxide, which is produced during Portland cement hydration. Silica addition refines pore structure and produces concrete of improved mechanical strength.

What is densified silica fume?

Densified Silica Fume (DSF) (9994039) is a ready-to-use dry densified silica fume used to produce very durable, high strength concrete with very low permeability and low rebound shotcrete. Used For: DSF is recommended for use whenever high-performance concrete or shotcrete is required.

How does silica fume effect concrete?

When silica fume is added to concrete, initially it remains inert. Its small particle size which is 100 times finer than ordinary portland cement complements the finess modulus of concrete and provides a ball-bearing effect, which improves thixotropic behavior, in effect modifying concrete viscosity.

What is densified microsilica?