How much does silica fume cost?

Condensed silica fume costs from $400-$1,000/ton, which is significantly higher than portland cement ($90/ton).

Is silica fume cheaper than cement?

Silica fume is much cheaper than cement therefore it is very important from economical point of view. Silica fume also decrease the voids in concrete. Consistency of cement depends upon its fineness. Silica fume is having greater fineness than cement.

What is the difference between micro silica and silica fume?

Silica fume consists primarily of amorphous (non-crystalline) silicon dioxide(SiO2). Concrete containing silica fume can have very high strength and can be very durable. Micro Silica Fume or Microsilica is finer particle than Cement. It is produced by some chemical processing of the ash.

What is silica fume used for in concrete?

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. It may be added directly to concrete as an individual ingredient or in a blend of portland cement and silica fume.

How is fumed silica made?

Fumed silica is made from flame pyrolysis of silicon tetrachloride or from quartz sand vaporized in a 3000 °C electric arc.

What is fly ash concrete mix?

Fly ash is a pozzolan, a substance containing aluminous and siliceous material that forms cement in the presence of water. When mixed with lime and water, fly ash forms a compound similar to Portland cement.

What is micro silica concrete?

Microsilica, also as silica fume or condensed silica fume, is a mineral admixture composed of very fine solid glassy spheres of silicon dioxide. As a result, microsilica concrete is able to strongly protect reinforcement and embedments from aggressive agents.

What is the percentage of silica in cement?

The cement contains 35 to 40 percent lime, 40 to 50 percent alumina, up to 15 percent iron oxides, and preferably not more than about 6 percent silica. The principal cementing compound is calcium aluminate (CaO · Al2O3).

What is the particle size of silica fume?

Silica fume particles are spherically shaped and very fine, having a mean size of 0.1–0.3 µm (De Belie et al., 2017; Jiao et al., 2017; Thomas, 2013). In some cases, individual particles can fuse together to form small agglomerates that may range from 1 to 100 μm in size (ACI-Committee-234, 2006).

How is micro silica made?

Silica fume, also known as microsilica, is an extremely fine noncrystalline polymorph of silica and is produced in electric arc furnaces (EAFs) as a by-product of silicon and ferrosilicon alloy production. As just mentioned, silica fume arises as a by-product of silicon or ferrosilicon alloy formation in an EAF.

What is fumed silica?

Fumed silica serves as a universal thickening agent and an anticaking agent (free-flow agent) in powders. Like silica gel, it serves as a desiccant. It is used in cosmetics for its light-diffusing properties. It is used as a light abrasive, in products like toothpaste.

What is the cost of fly ash bricks?

Questions & Answers on Fly Ash Bricks

What is the cost of silica fume?

The main component of the condensed silica fume is amorphous silica, and the furnace gas is also entrapped with impurities, such as free C, Fe2O3, CaO, K2O, Na2O and so on. Silica sand can cost between $50 to over $300 per ton. The cost depends on location of the sand mine and delivery location.

What is the price of microsilica per ton?

Its price is $ 150-800 per ton. It is comprehensive utilization of waste, so the price is very low. It can be devided into Undensified Silica Fume (320-360kg/m3) and Densified Silica Fume (630-680 kg/m3). The densified microsilica price is higher than undensified, because this kind of product need to be proceed by densified equipment.

What is micro micro silica?

Micro silica is an amorphous polymorph of silica (SiO 2 / silicon di-oxide). It is also known as silica fume or condensed silica fume. It is an ultrafine powder collected as a by-product during the production of the silicon and ferrosilicon alloys. It consists of spherical particles having an average diameter of 150nm.

How does silica fume affect concrete?

On adding silica fume to concrete, there is an automatic increase in water demand. This often results in requiring one additional pound of water for every pound of silica fume added. This issue can easily be solved by using High range water reducers (HRWR). 05. Effects on Consistency and Bleeding of Fresh Concrete