Product Data Sheet Show all documents

Sika ViscoFlow®-1221 R

Concrete Admixture for High Flow / Self-Compacting Concrete

Sika ViscoFlow®-1221 R is a third generation superplasticiser for concrete and mortar. It is particularly developed for the production of high flow concrete with exceptional flow retention properties and significant reduction in bleeding and segregation.

Sika ViscoFlow®-1221 R acts by surface adsorption on the cement particles producing a sterical separation effect. Concrete produced with Sika ViscoFlow®-1221 R exhibits the following properties:
  • Excellent flowability (resulting in highly reduced placing and compacting efforts)
  • Strong self-compacting behaviour
  • Improved shrinkage and creep behaviour
  • Increased carbonation resistance of the concrete
  • Improved finish
  • Reduce tendency to bleeding and segregation

Sika ViscoFlow®-1221 R does not contain chlorides or other ingredients which promotes steel corrosion. Therefore, it may be used without restriction for reinforced and pre-stressed concrete construction.
Product Data Sheet Show all documents

Usage

Sika ViscoFlow®-1221 R facilitates excellent flowability with optimal cohesion and longer slump retention properties.
Sika ViscoFlow®-1221 R is used for the following types of concrete:
  • High flow concrete
  • Self-compacting concrete (S.C.C.)
  • High strength concrete
  • Watertight concrete

The combination of high water reduction, excellent flowability and long slumpretention provides clear benefits in the above mentioned applications.  

Advantages

Sika ViscoFlow®-1221 R acts by surface adsorption on the cement particles producing a sterical separation effect. Concrete produced with Sika ViscoFlow®-1221 R exhibits the following properties:
  • Excellent flowability (resulting in highly reduced placing and compacting efforts)
  • Strong self-compacting behaviour
  • Improved shrinkage and creep behaviour
  • Increased carbonation resistance of the concrete
  • Improved finish
  • Reduce tendency to bleeding and segregation

Sika ViscoFlow®-1221 R does not contain chlorides or other ingredients which promotes steel corrosion. Therefore, it may be used without restriction for reinforced and pre-stressed concrete construction.

Packaging

200 L drums and bulk

Colour

Liquid / Slightly yellowish

Product Details

Product Information

Composition

Modified aqueous solution of modified polycarboxylate copolymers

Shelf life

12 months from date of production if stored properly in undamaged unopened, original sealed packaging.

Storage conditions

Store in dry conditions at temperatures between +5 °C and +30 °C. Protect from direct sunlight and frost.

Density

at 20 °C

1.075 ± 0.005 kg/L
Technical Information

Concreting Guidance

The standard rules of good concreting practice, concerning production and placing, are to be followed.
Laboratory trials before concreting on site are strongly recommended when using a new mix design or producing new concrete components.
Fresh concrete must be cured properly and as early as possible.

Application

Application Information

Compatibility

Sika ViscoFlow®-1221 R may be combined with the following products:

  • Plastiment® P121R
  • Plastiment® VZ
  • Sika® Fume
  • SikaFibre®

Do not use viscocrete / viscoflow series combined with sikament series.

To produce flowing and / or self-compacting concrete, special concrete mix design is required.

Pre-trials are recommended and mandatory if combinations with the above products are required.

Please consult to our Technical Service Department.

DISPENSING

Sika ViscoFlow®-1221 R is added to the gauging water or simultaneously poured with it into the concrete mixer. For optimum utilisation of its high water reduction property and slump keeping property, we recommend to add Sika ViscoFlow®-1221 R into “wet” concrete mixture and then thorough mixing at a minimal wet mixing time of 60 seconds.


The addition of the remaining gauging water (normally 5 % of designed water quantity to fine tune concrete consistency) may only be started after two-thirds of the wet mixing time, to avoid surplus water in the concrete.


When added directly to the freshly mixed concrete, the plasticizing effects is more pronounced.


When accidental overdosing occurs,Sika ViscoFlow®-1221 R does not entrain excessive amounts of air, however the set retarding effect increases.

 
Consumption

Recommended Dosage

For soft plastic concrete :

0.2 - 0.6 % by weight of binder

For flowing and self compacting concrete :0.6 - 2.0 % by weight of binder (S.C.C.)

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