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Question:
Published on: 30 June, 2022

Discuss plasticizers and superplasticizers, indicating their purpose. Name some products and their dosage for use as plasticizers and superplasticizers.

Answer:

PLASTICIZER :- Plasticizers is used mainly to fluidity the mix and improve the workability of concrete, mortar or grout. Plasticizers are high range water – reducers. When plasticizers are used they get absorbed on the cement particles and form a thin sheath. This thin sheath inhibits the surface hydration reaction between water and cement.

  1. Anionic surfactants such as lignosulphonates and their modifications and derivatives , salts of sulphonates hydrocarbons.
  2. Nonionic surfactants such as polyglycol esters acid of hydroxylated carboxylic acdis and their modifications and derivatives.
  3. Other products such as carbohydrates etc.

SUPERPLASTICIZERS:- They are high range water reducers used for producing self compacting self strength and high performance concrete.

  1. Sulphonated malanie-formaldehyde condensates (SMF)
  2. Sulphonated naphthalene- formaldehyde condensates (SNF).
  3. Modified lignosulphonates (MLS).
Subjects
Design of Reinforced Concrete Structures Irrigation Engineering Surveying Concrete Technology
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