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 C
3A 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.
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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
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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.
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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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