Product Data Sheet
Edition 09/04/2012
Identification no.13.1.065
Version no. 01
SikaPlast 257
SikaPlast 257
PCE Based Superplasticiing and Set Retarding
Concrete Admixture.
Description
rd
SikaPlast 257 is a 3 generation polymer based high performance
superplasticizer for producing soft consistency concrete.
Construction
SikaPlast 257 meets the requirements of ASTM C 494 Type D & G
SikaPlast 257 is mainly suitable for the manufacture of concrete for
RMC plants and site batch concrete
Uses
SikaPlast 257 is used for the following types of concrete:
High strength Bored piles
Bridges and cantilever
Slender components with dense reinforcement
Advantages
Sika Plast 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:
Q
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 4-6 hours (still depends on
admixture dosage, cement type, temperature)
Improved creep and shrinkage resistance characteristics
SikaPlast 257contains neither chlorides nor other corrosion-inducing
subsances and can therefore be used without any restrictions for
reinforced concrete structures.
Product Data
Base
Modified Poly carboxylate in water
Form/Colour
Liquid/ brownish colour
Packaging
5 / 25 / 200/1000 litres
Storage conditions
Stored in dry conditions, protected from direct sunlight and at temperatures between +5 C and +30 C.
Shelf-life
12 months if stored properly in original unopened packaging
Technical Data
0
Density (at 20 C)
1.110-1.135 kg/litre.
pH Value
4.50-6.50
SikaPlast 257 1/2
Application Details
Dosage
0.6-1.6ltr per 100 kg of cement
Typical 0.8 to 1.2 lts/100kg
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 not
pre-mixed prior its addition.
SikaPlast 257 is compatible with all Portland Cement types
Addition/Mixing
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.
Construction
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.
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.
Note on application/ Limits
Overdosing will result in increased workability and setting time of the
concrete; however provided that curing is effective, ultimate concrete
strength and properties will not be affected.
Accurate dispensing equipment can be supplied by Sika Limited
(Vietnam)
Use an appropriate concrete mixer and do not mix by hand.
Trial mixes are recommended to establish exact dosage rates required
to suit individual requirements. Please contact Sika Technical
Department for further assistance.
Curing
Effective measures for concrete curing must be followed
Health and Safety Information
Protective Measures
Avoid prolonged contact with skin. Wash off thoroughly with soap water.
In case of contact with eyes or mouth, rinse immediately with clean warm
water and seek medical attention without delay.
Avoid contact with food stuff and utensils
Ecology/ Waste disposal
Do not dispose of into water or soil, but according to local regulations.
Transportation class
Non-hazardous.
Toxicity
Non-toxic
Disclaimer
The information, and, in particular, the recommendations relating to the application and end-use
of Sika products, are given in good faith based on Sikas current knowledge and experience of
the products when properly stored, handled and applied under normal conditions in accordance
with Sikas recommendations. In practice, the differences in materials, substrates and actual site
conditions are such that no warranty in respect of merchantability or of fitness for a particular
purpose, nor any liability arising out of any legal relationship whatsoever, can be inferred either
from this information, or from any written recommendations, or from any other advice offered. The
user of the product must test the products suitability for the intended application and purpose.
Sika reserves the right to change the properties of its products. The proprietary rights of third
parties must be observed. All orders are accepted subject to our current terms of sale and
delivery. Users must always refer to the most recent issue of the local Product Data Sheet for the
product concerned, copies of which will be supplied on request.
Sika Limited (Vietnam)
Nhon Trach 1 Industrial Zone,
Nhon Trach Dist., Dong Nai Province
Tel: (84-61) 3560 700 Fax: (84-61) 3560 699
www.sika.com.vn, sikavietnam@vn.sika.com
Sika Plast 257 2/2
