Product Data Sheet Show all documents

Sika® ViscoCrete®-8490

ULTRA HIGH RANGE WATER REDUCER WITH HARDENING ACCELERATION EFFECT CONCRETE ADMIXTURE.

Sika® ViscoCrete®-8490 is a 3rd generation polymer based high performance superplasticizer with hardening acceleration effect for concrete.
Sika® ViscoCrete®-8490 meets requirements of ASTM C494 type F.

Sika® ViscoCrete®-8490 combines different modes of actions. By adsorption on the surface of the fines and keeping them apart while the hydration is in progress, Sika® ViscoCrete®-8490 effects the following concrete properties:
  • Extremely high water reduction (enhanced impermeability & strength of concrete produced).
  • Compatible with SCM like GGBFS, PFA.
  • Faster development of early strength. Can reduce the time of steam curing process for achieving early strength.
  • Workability can be maintained up to 90 minutes (depending on cement type, temperature and mix design).
  • Improved creep and shrinkage resistance characteristics.
Product Data Sheet Show all documents

Usage

Sika® ViscoCrete®-8490 is mainly suitable for the manufacture of concrete in precast factories and other in-situ precast concrete elements.
Sika® ViscoCrete®-8490 is used for the following types of concrete:
  • High-strength/High performance concrete spun pile in precast industry.
  • Concrete with extreme water reduction.
  • Soft consistency concrete with extended working time, suitable for both small and large spun piles.
 

Advantages

Sika® ViscoCrete®-8490 combines different modes of actions. By adsorption on the surface of the fines and keeping them apart while the hydration is in progress, Sika® ViscoCrete®-8490 effects the following concrete properties:
  • Extremely high water reduction (enhanced impermeability & strength of concrete produced).
  • Compatible with SCM like GGBFS, PFA.
  • Faster development of early strength. Can reduce the time of steam curing process for achieving early strength.
  • Workability can be maintained up to 90 minutes (depending on cement type, temperature and mix design).
  • Improved creep and shrinkage resistance characteristics.

Packaging

200/1000 litres.

Colour

Liquid/ 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

1.065 – 1.085 kg/L (at 20°C).
Technical Information

Concreting Guidance

Concrete placing: With the use of Sika® ViscoCrete®-8490, 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

Sika® ViscoCrete®-8490 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.
Sika® ViscoCrete®-8490 is compatible with all Portland Cement types.

DISPENSING

Sika® ViscoCrete®-8490 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 – 2.0 ltr per 100 kgs of cement/binder.
Typical dosage:

  • For normal concrete: 0.6 - 0.9 ltr per 100 kgs of cement/binder.
  • For spun pile: 0.8 – 1.2 ltr per 100 kgs of cement/binder.

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