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Superplasticizers in concrete UPSC NOTE

 Role of Superplasticizers in concrete

  • The water cement (W/C) ratio is an important factor deciding the durability of concrete. 

  • Its impermeability, strength, and durability are directly proportional to this and so this has to be kept small.

  • In normal cement pastes, when cement particles come into close contact with each other, there is a tendency for the pastes to form large ‘floes’ due to attractive forces acting between them. 

  • Because of such formation, more water than required is added

  • This increases the W/C ratio and affects the concrete’s properties.

  • These can be overcome by adding superplasticizers at the appropriate stage of mixing the ingredients of concrete

  • It helps to reduce inter-particle attraction between cement particles and to disperse the cement particles with less water

  • These superplasticizers actually form a chain of molecules and are completely absorbed into the system.

  • Superplasticizers are sulphonated melamine formaldehyde condensates or sulphonated naphthalene formaldehyde condensates

  • These are used to produce ‘flowing’ concrete in cases where placing in inaccessible locations is required.

  • They are also used in the production of high strength concrete using normal workability but a very low water/cement ratio so as to reduce the heat of hydration in mass concrete.

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Learnerz IAS | Concept oriented UPSC Classes in Malayalam: Superplasticizers in concrete UPSC NOTE
Superplasticizers in concrete UPSC NOTE
Learnerz IAS | Concept oriented UPSC Classes in Malayalam
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