Sika ViscoCrete-20 HE

USES
Sika ViscoCrete-20 HE PK is especially suitable for
the production of concrete mixes which require
high early strength development, powerful water
reduction and excellent flowability.
Sika ViscoCrete-20 HE PK is mainly used for the
following applications:
▪ Pre-cast concrete
▪ Fast track concrete
▪ In situ concrete requiring fast stripping time
▪ Self Compacting Concrete (SCC)

CHARACTERISTICS / ADVANTAGES
Sika ViscoCrete-20 HE PK as a powerful superplasticizer acts by different mechanisms.
Through surface adsorption and sterical effects
separating the binder particles the following
properties are achieved:
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 behavior
▪
Reduced energy cost for steam cured pre-cast
elements
▪
Especially suitable for the production of Self
Compacting Concrete (SCC)
▪
▪ Improved shrinkage and creep behavior
Reduced closure times for repairs of roads and
runways
▪
Sika ViscoCrete-20 HE PK does not contain chlorides or other ingredients which promote the corrosion of steel reinforcement. It is therefore suitable for reinforced and pre-stressed steel.
APPROVALS / STANDARDS
Sika ViscoCrete-20 HE PK complies with the requirements for superplasticizers according to
ASTM C494 Type F.

PRODUCT INFORMATION
Chemical Base Aqueous solution of modified polycarboxylates
Packaging 1000 ltr IBC
200 ltr drum
20 ltr plastic can
05 ltr jerry can
Bulk supply in tanker
Appearance / Colour Light brownish liquid, clear to slightly cloudy
Shelf Life 12 months minimum from date of production if stored properly in
original unopened packaging
Storage Conditions The product must be stored properly in undamaged, unopened original sealed packaging in dry conditions at temperatures between
+5° C and +35° C. Protect from direct sunlight and frost.
pH-Value ≥4
Total Chloride Ion Content Nil (EN 934-2)
Specific gravity 1.11 ± 0.03
APPLICATION INFORMATION
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.
It is advisable to carry out trial mixes to establish the correct
dosage.

Compatibility Sika® ViscoCrete®-20 HE PKmay by combined with the following
Sika Products among others:
▪ Sika Pump
▪ Sika Ferrogard-901
▪ Sika Fume
▪ Sika Rapid
▪ Sika Stabilizer-229
▪ Sika Retarder and Sika Retardol 25
Trials are always recommended before combining products.
Dispensing Sika ViscoCrete-20 HE PK is added to the gauging water or added
with it into the concrete mixer. For optimum utilization of the high
water reduction property we recommend thorough mixing at a minimal wet mixing time of 60 seconds.
BASIS OF PRODUCT DATA
All technical data stated in this Product Data Sheet are
based on laboratory tests. Actual measured data may
vary due to circumstances beyond our control.
LIMITATIONS
When accidental overdosing occurs (within reason), apart from retardation of the initial set and
increased bleeding, no detrimental effect will
take place. When using Sika ViscoCrete-20 HE PK
to produce Self Compacting Concrete, a suitable
mix-design has to be used.