Product Data Sheet Show all documents

Sika® ViscoCrete®-20 HE

High Range Water Reducer / Superplasticiser

Sika® ViscoCrete®-20 HE is a liquid admixture for concrete and mortar which is used as high range water reducer or superplasticiser. Sika® ViscoCrete®-20 HE is designed to work on a combination of electrostatic adsorption and steric repulsion effects allowing solid particles to be effectively dispersed. Therefore a high level of fluidity and plasticising can be reached with a high water reduction which provides many advantages.

  • Pronounced increase in the early strength development, resulting in very economic stripping times for pre-cast and in situ concrete
  • Extremely powerful water reduction, resulting in high density, high strengths and reduced water permeability etc.
  • Excellent plasticizing effect, resulting in improved flowability placing and compacting behaviour
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Product Data Sheet Show all documents

Usage

Production of concrete mixes which require high early strength development, powerful water reduction and improved flowability.
 
  • Precast concrete
  • Fast-track concrete
  • In situ concrete requiring fast stripping time
  • Self Compacting Concrete (SCC)
 

Advantages

  • High water reduction
  • High final density and strength properties
  • Reduced shrinkage, creep, water permeability, etc
  • Improved flowability, placing and compacting behaviour
  • Improved surface finish
  • Increased early strength development
  • Early removal of formwork
  • Reduced curing
  • Does not contain chlorides
  • Suitable for use in reinforced and pre-stressed concrete

Packaging

Drum
IBC
Bulk supply

Refer to current price list for packaging variations

Colour

Light brown liquid

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

CE Marking and Declaration of Performance to EN 934–2 - Admixtures for concrete, mortar and grout.
Product Information

Chemical Base

Aqueous solution of modified polycarboxylates

Shelf Life

12 months from date of production

Storage Conditions

The product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +10 °C and +30 °C. Always refer to packaging.

Density

~1,09 kg/l at +20 °C

pH-Value

~4,5

Conventional Dry Material Content

~40,0 M.-%

Viscosity

~145 mPa· s at +23°C

Total Chloride Ion Content

≤ 0,1 M.-%

Equivalent Sodium Oxide

≤ 2,0 M.-%
Technical Information

Concreting Guidance

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

Application

Application Information

Compatibility

Sika® ViscoCrete®-20 HE may be combined with many other Sika products.
Trials must always be carried out before combining products in specific mixes. Contact Sika Technical Services for additional information and any specific combinations.

Dispensing

Sika® ViscoCrete®-20 HE is added to the gauging water or added with it into the concrete mixer.

To achieve the optimum performance, a wet mixing time of at least 60 seconds is recommended.
To avoid excess water in the concrete, the final dosage must begin after 2/3 of the wet mixing time.

Restrictions

Sika® ViscoCrete®-20 HE must not be added to dry cement.
Consumption

Recommended Dosage

  • For medium workability: 0,2–0,8 % by weight of cement
  • For concrete of high workability, very low water/cement ratio and for self compacting concrete: 1,0–2,0 % by weight of cement

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