Discuss plasticizers and superplasticizers, indicating their purpose. Name some products and their dosage for use as plasticizers and superplasticizers.
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.
SUPERPLASTICIZERS:- They are high range water reducers used for producing self compacting self strength and high performance concrete.
Explain Kelly Ball to measure the workability of concrete. Mention the limitation of the test.
Give the physical characteristics of 53 grade OPC.
Short notes on :
Write notes on Mixing and Mixer machines of concrete.
