How Does Silica Fume Work in Concrete? 

When silica fume is added to concrete, initially it remains inert.  Once portl and cement and water in the mix start reacting with each other (hydrating),  primary chemical reactions produce two chemical compounds: Calcium Silicate Hydrate (CSH), which is the strength producing crystallization, and Calcium Hydroxide (CH), a by-product also called free lime which is responsible for nothing much other than lining available pores within concrete as a filler or leaching out of inferior concrete.  Pozzolanic reaction occurs between silica fume and the CH, producing additional CSH in many of the voids around hydrated cement particles. This additional CSH provides the concrete with not only improved compressive, flexural and bond- strength but also a much denser matrix, mostly in areas that would have remained as small voids subject to possible ingress of deleterious materials.

Pozzuoli, ItalyThe word pozzolanic is derived from the name of a town in Italy, Pozzuoli. It was there that the ancient Romans combined ground lime stone with volcanic ash to produce mortars to bind large stones together. The durability of the resulting structures can still be witnessed today, two thousand years later.

The transport properties through the silica fume concrete medium are dramatically curtailed, i.e. liquid  compounds and even electrical currents experience a diminished capability to migrate, resulting in very low permeability and high electrical resistivity.  Silica fume’s benefits are already evident in the fresh concrete state before it begins to harden.  Its small particle size which is 100 times finer than ordinary portl and cement complements the fines modulus of concrete and provides a ball-bearing effect, which improves thixotropic behavior, in effect modifying concrete viscosity.  Because of the high surface area of silica fume particles affecting the mobility of water within concrete, segregation and bleeding of concrete are virtually eliminated.  Rheological benefits inherent in silica fume concrete allow for custom-tailoring concrete placement methods, such as very high cohesive workability, ability of fluid concrete to hold slope, and/ or long distance pumping of concrete.

1.We has been focusing on producing silica fume (Microsilica) since 2008 and capacity upto 5000-8000MT/month and always has raw material stock of 5000MT in our warehouse.

2.Our manufacture equipped with silos, electric motors, goods transfer machine and other quality control machine ensure our goods not only qualified but also stable.

3.We have our own labs, test samples of each batch of raw material also for each batch of finished products for every client.

4.The bulk density of our goods covers a wide range of 190-750kg/m3, which can fully meet all clients’s request;

5.Our packing term include small bag, jumbo bag, wowen bag and paper bag also custom packing terms enable us offer the flexibility packing for our clients.

6.A professional team for international trading in silica fume field for more than 10 years ensure our clients the most efficiency and high quality service.

Why choose us?