foundation system of burj al arab

Application of superplasticizers

Superplasticizers provide revolution on the use of concrete in a number of ways, making it possible to place it, and to do so easily, where it is not possible to do so before. Superplasticizers make it also possible to produce concrete with significantly superior strength and other properties, now termed high performance concrete.


Superplasticizers do not significantly affect the setting time of concrete except that, when used with cement having a very low C3A content, there may be excessive retardation.
They can be successfully used in concrete containing fly ash and are particularly valuable when silica fume is present in the mix because that material increases the water demand of the mix. However, if re-dosage is necessary, the quantity of the superplasticizer required is larger than when the concrete contains no silica fume.
SUPER PLASTICIZER
AC-MENT-BV-430-A2: Super Plasticizer for PC. Base
 
AC-MENT-BV-430-A3: Super Plasticizer for pumpable
 concrete on PC Base 
AC-MENT-BV-430-E6:High range Super Plasticizer on
 modified basis for pumpable concrete
Superplasticizers do not influence shrinkage, creep, modulus of elasticity or resistance to freezing and thawing. They have no effect on the durability of concrete. Specifically, durability on exposure to sulfates is unaffected. The use of superplasticizers with an air-entraining admixture requires caution as sometimes the actual amount of entrained air is reduced by the superplasticizers.
FDN-A, B AND C Superplasticizer is a dry powdered admixture. It is produced through such a process: 1) sulphonating refined naphthalene with sulfuric acid, 2) condensing with formaldehyde, 3) neutralization, and 4) filtering. It conforms to GB8076-1997 and is mainly used for various high-strength concrete, steel concrete, prestressed concrete, large formwork concrete, slipforming concrete etc.

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