Silica fume and microsilica are two terms often used interchangeably when talking about concrete strength. However, they are not the same thing and understanding the differences between them can help you make informed decisions about concrete mix design. In this article, we will explore how the difference between silica fume and microsilica can affect the strength of your concrete.
Silica fume and microsilica are both by-products of the production of silicon and ferrosilicon alloys. They are both amorphous silica and are extremely fine particles, with most particles less than 1 micron in size. However, silica fume is typically collected from the exhaust gases produced during the production process, while microsilica is collected from the by-product of the reaction between the liquid silicon and the oxygen in the air.
One of the main differences between silica fume and microsilica is their particle size. Microsilica particles are smaller and more uniform in size, while silica fume particles are irregular in shape and can vary in size. This means that microsilica can pack more densely into the voids between cement particles, resulting in a stronger and more durable concrete.
Moreover, silica fume is considered a pozzolan, which means it reacts chemically with the calcium hydroxide in cement to form additional calcium silicate hydrates. These additional hydrates fill any voids in the cement paste, resulting in a denser and stronger concrete. On the other hand, microsilica has a limited pozzolanic reaction and contributes to the strength of the concrete mostly through physical packing.
In terms of usage, silica fume is often added in higher quantities to concrete mix designs to achieve the desired strength, while microsilica is typically used in smaller amounts to improve the workability, durability, and permeability of the concrete. However, using too much silica fume can cause the concrete to become too brittle and prone to cracking.
In conclusion, while silica fume and microsilica are both useful admixtures in improving the strength of concrete, the main difference between them lies in their particle size and their pozzolanic reaction. Choosing the right admixture for your concrete mix design depends on the specific requirements of your project, such as desired strength, workability, and durability. It is always recommended to consult with a professional engineer or concrete technician to ensure the optimal use of silica fume or microsilica in your concrete mix.
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