Concrete consists of cement, sand, aggregate and water. Anything other than these if added in concrete either before or during mixing to alter the properties to our desired requirement are termed as admixtures. The use of admixtures offers certain beneficial effects to concrete like improved workability, acceleration or retardation of setting time, reduce water cement ratio, and so on.
There are two basic types of admixtures available: chemical & mineral. Admixtures like flyash, silicate fume, slag comes in the category of mineral admixtures. They are added to concrete to enhance the workability, improve resistance to thermal cracking and alkali–aggregate reaction and to enable reduction in cement content.
Flyash is fine residue left after combustion of ground or powdered coal. They are all generally finer than cement and consist mainly of glassy–spherical particles as well as residues of hematite and magnetite, char and some crystalline phases formed during cooling. The use of flyash in concrete makes the mix economical, and improves the workability, reduces segregation, bleeding and reduced heat of hydration but also provides ecological benefits.
Silica fume, which is also known as microsilica. It is obtained as a byproduct during the production of silicon and ferrosilicon alloys. The particle size of silica fume is 100 times smaller than cement particles i.e. its fine as cigarette smoke. Its a highly effective pozzolanic material, which improves the properties of concrete such as improved compressive strength, bond strength, abrasion resistance, dense concrete that results in protection of reinforcement against corrosion.
Chemical admixtures are added to concrete in very small amounts mainly for air entrainment, reduction of water or cement content, plasticizing of fresh concrete mixtures or to control the setting time of concrete. These admixtures can be broadly catagorised as superplasticizers, accelerators, retarders, water reducers and air entraining admixtures.
ADMIXTURE FOR CONCRETE
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Production of admixtures for concrete is not very complicated. For the production, there is need usable and tried a formulation, raw materials and mixing tank. For raw materials to be used, quantities to be used and ingredients usage rankings, you should decide to look into this formulation. Therefore, formulation and productıon methods of chemical admixtures used in concrete are important. If you have not a good formulation, you cannot make healthy and efficient production of any concrete admixtures.
If you need any
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CHEMICAL ADMIXTURES USED IN CONCRETE
CONSTRUCTION CHEMICALS
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ENCYCLOPEDİA - 2
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All construction chemicals in the encyclopedia are producible easily. You need no help and no technıcal support. The encyclopedia is enough to produceadmixtures for concrete itself.
CONSTRUCTION CHEMICALS
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