Product Data Sheet Show all documents

SikaPlast®-257

PCE BASED SUPERPLASTICIZING AND SET RETARDING CONCRETE ADMIXTURE

SikaPlast®-257 is a 3rd generation polymer based high performance superplasticizer for producing soft consistency concrete.
SikaPlast®-257 meets the requirements of ASTM C 494 Type D & G

SikaPlast®-257 combines different modes of actions. By adsorption on the surface of the fines and keeping them apart while the hydration is in progress, SikaPlast®-257 effects the following concrete properties:
  • Improve mortar phase when using coarse sand
  • Long slump keeping and high water reduction
  • High flowability (considerably reduced placing and compacting work)
  • Faster evolution of early strength development
  • Workability can be maintained up to 3 hours (still depends on admixture dosage, cement type, temperature)
  • Improved creep and shrinkage resistance characteristics
  • When used at higher dosages, SikaPlast®-257 can give extendedworking time
Product Data Sheet Show all documents

Usage

SikaPlast®-257 is mainly suitable for the manufacture of concrete for RMC plants and site batch concrete
SikaPlast®-257 is used for the following types of concrete:
  • Bored piles
  • Barrette foundations and diaphragm walls
  • Ground and suspended slabs
  • Columns and walls
 

Advantages

SikaPlast®-257 combines different modes of actions. By adsorption on the surface of the fines and keeping them apart while the hydration is in progress, SikaPlast®-257 effects the following concrete properties:
  • Improve mortar phase when using coarse sand
  • Long slump keeping and high water reduction
  • High flowability (considerably reduced placing and compacting work)
  • Faster evolution of early strength development
  • Workability can be maintained up to 3 hours (still depends on admixture dosage, cement type, temperature)
  • Improved creep and shrinkage resistance characteristics
  • When used at higher dosages, SikaPlast®-257 can give extendedworking time

Packaging

200/1000 litres

Colour

Liquid/ dark brown colour

Product Details

Product Information

Chemical base

Modified Poly carboxylate in water

Shelf life

12 months if stored properly in original unopened packaging.

Storage conditions

Stored in dry conditions, protected from direct sunlight and at temperatures between +5 °C and +30 °C

Density

1.100 – 1.135 kg/L (at 20°C)
Technical Information

Concreting Guidance

Concrete placing: With the use of SikaPlast®-257, concrete of highest quality is being produced, however state of the art concrete technology, such as mixing, placing vibrating and curing must be respected and applied
Curing: Effective measures for concrete curing must be followed

 

Application

Application Information

Compatibility

SikaPlast®-257 may be combined with all Sikament®, Sika® Aer, Sika®Pump, Sikacrete® PP1 products, but must be added separately to the mix and no t premixed prior its addition
SikaPlast®-257 is compatible with all Portland Cement types

DISPENSING

SikaPlast®-257 is added to the gauging water prior to its addition to the dry mix or added separately to the wetted concrete mix.
For optimum utilization of the ultra-high range water reducer we recommend a minimum wet mixing time of 60 seconds.
When adding the balance of the batching water to adjust concrete consistency this should be done after a minimum of 2/3 of the wet mixing time to avoid surplus water in the concrete.

 
Consumption

Recommended Dosage

0.5 - 2ltr per 100 kg of cement/binder
Typical 0.8 to 1.2 ltr/100kg of cement/binder

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