Which type of silica fume is better?

Which type of silica fume is better?

1. What is silica fume?
Silica fume, also known as microsilica, is a byproduct of producing silicon metal or ferrosilicon alloys. It is a highly reactive pozzolanic material that is used to enhance the strength and durability of concrete.
2. What are the types of silica fume?
There are two main types of silica fume: densified silica fume and undensified silica fume. Densified silica fume has been densified in agglomerates and is easier to handle, transport, and mix with concrete compared to undensified silica fume.
3. Which type is better?
In terms of performance, both densified and undensified silica fume will improve the strength, durability, and impermeability of concrete. However, densified silica fume is often preferred in practical applications due to its ease of use.
4. How is silica fume used in concrete?
Silica fume is usually added to concrete in small amounts, typically ranging from 5% to 10% of the total weight of cementitious materials. It is usually mixed with water before being added to the concrete mixture to ensure even distribution.
5. What are the benefits of using silica fume in concrete?
Using silica fume in concrete can significantly improve the compressive strength, durability, and resistance to chloride ion penetration of the concrete. It can also reduce the permeability of the concrete, making it more resistant to chemical attacks and harsh environmental conditions.
6. Are there any drawbacks to using silica fume?
While silica fume offers many benefits to concrete, it can be expensive compared to other supplementary cementitious materials. Additionally, proper handling and safety precautions must be taken when working with silica fume as it is a fine powder that can be harmful if inhaled.

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