Standard Silica #9282640

A- chem

Benefits of A-chem micro silica in concrete aditive longer service life: A-Chem microfine is a highly reactive pozzolan and give concrete a dense microstructure, lower permeability & higher electrical resistivity leading to improved durability.

The durability of a reinforced concrete structure can be difined as the capability of the structure to maintain its original functional and structural characteristics during the expected service life in the exposure conditions it was intended for combined with correct design and workmanship, micro silica concrete offer characteristics that will ensure long term durability and service life. Higher strength concrete that is often essential in magor projects such as record breaking tall building, roads and bridge.

These engineering applications requiring high strength concrete use microsilica as a cost effective means to increase comprehensive strength. Ultra High strength concrete (UHSC) typically defined as > 150mpa can be achieved using higher dosage of A- Chem microfine increased strength results from micro silica``s particles packing & pozzolanic reaction in micro silica concrete the thickness of the transition zone (interface) between the cementitious paste and aggregate is reduced and the CH crystal are smaller and more randomly oriented, resulting in decreased porsoity & increased inter face bonding strength.

Silica fume, be also known as micro silica is silicon dioxide, silica it is an ultrafine powder collected as a by product of the silicon and ferrosilicon alloy production. The main field of application is as pozzolanic material for high performance concrete.

Application.:

Because of its extreme fineness and high silica content, silica fume is very effective pozzolanic material standard specification for silica fume used in cementitious, mixture are ASTM (1240, [8] EN. 13263.[9] .

Silica fume is added, to cement concrete to improve its properties in particular it's comprehensive strength, bond strength and abrasion resistance, these improvement steam from both the mechanical.

Improvements resulting from additon of Avery fine powder to the cement, paste mix as well as from the pozzolanic reactions between the silica fume and free calcium hydroxide in the paste.

Addition of silica fume also reduce the permeability of concrete to chloride ions, which protects the reinforced steel of concrete from corrosion especially in chloride rich environments such as coastal, regions and those of humid continental roadways and runways, ( because of the use of deicing Salt) and Saltwater bridges.

Effect of silica fume on different properties of fresh and hardened, concrete include.