Product Data Sheet Show all documents

SikaPlast®-257

PCE Based Superplasticing and Set Retarding Concrete Admixture

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

SikaPlast® -257 combines diffent 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 :
  • 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 4 hours (still depends on admixture dosage, cement type, temperature, W/C)
  • Improved creep resistance and shrinkage resistance characteristics
SikaPlast® -257 contains neither chlorides nor other corrosion-inducing subsances and can therefore be used without any restrictions for reinforced concrete structures.
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 :
  • High strength bored piles
  • Bridges and cantiliever
  • Slender components with dense reinforcement
 

Advantages

SikaPlast® -257 combines diffent 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 :
  • 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 4 hours (still depends on admixture dosage, cement type, temperature, W/C)
  • Improved creep resistance and shrinkage resistance characteristics
SikaPlast® -257 contains neither chlorides nor other corrosion-inducing subsances and can therefore be used without any restrictions for reinforced concrete structures.

Packaging

200 l/  PE drum 1,000 l/ IBC Tank

Colour

Brownish Liquid

Product Details

Product Information

Composition

Modified poly carboxylate in water

Shelf life

12 months from the date of production If stored properly in undamaged, original, sealed packaging.

Storage conditions

Store in dry conditions, protected from direct sunlight at temperature between 5°C and 30°C.

Specific Gravity

1.110-1.135 kg/l

pH-Value

4.5 - 6.5 Approx.

 
Technical Information

Concreting Guidance

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.

Specific Advice

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 utilisation 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.

Application

Application Information

Compatibility

SikaPlast® -257 may be combined with all Sikament®, Sika® Aer, SikaPump®, Sikacrete® PP1 products, but must be added separately to the mix and not pre-mixed prior its addition. SikaPlast® -257 is compatible with all Portland Cement types.
Consumption

Recommended Dosage

0.6 -1.6 l per 100 kg of cement or cementitious weight. Typical 0.8 - 1.2 l per 100 kg of cement or cementitious weight.

Documents