Product Data Sheet Safety Data Sheet Show all documents

Sika® ViscoCrete®-819 Extra

High Performance Superplasticizer

Sika® ViscoCrete®-819 Extra is a third generation superplasticizer for concrete and mortar. It meets the requirements for high range water reducing superplasticizer according to ASTM C494. 

Sika® ViscoCrete®-819 Extra as a powerful superplasti- 
cizer acts through several different mechanisms in- 
cluding surface adsorption and sterical effects separat- 
ing the binder particles. The following advantageous 
properties are achieved: 
▪ Pronounced increase in the early strength develop- 
ment, resulting in very economic stripping times for 
precast and in situ concrete 
▪ Extremely powerful water reduction, resulting in 
high density, high strength and reduced permeability 
for water etc. 
▪ Superior plasticising effect, resulting in improved 
flowability, placing and compacting behaviour. 
▪ Reduced energy costs for steam cured precast ele- 
ments 
▪ Especially suitable for the production of Self Com- 
pacting Concrete (SCC) Improved shrinkage and 
creep behaviour 
▪ Reduced closure times for repairs to roads and run- 
ways 
▪ Does not contain chlorides or any other ingredients 
which promote the corrosion of steel. It is therefore 
suitable for use in reinforced and prestressed con- 
crete structures. 
Product Data Sheet Safety Data Sheet Show all documents

Usage

Sika® ViscoCrete®-819 Extra is especially suitable for 
the production of concrete mixes which require high 
early strength development, powerful water reduction 
and improved flowability. 
Sika® ViscoCrete®-819 Extra is mainly used for the fol- 
lowing applications: 
▪ Precast concrete 
▪ Fast-track concrete 
▪ In situ concrete requiring fast stripping time 
▪ Self Compacting Concrete (SCC)   

Advantages

Sika® ViscoCrete®-819 Extra as a powerful superplasti- 
cizer acts through several different mechanisms in- 
cluding surface adsorption and sterical effects separat- 
ing the binder particles. The following advantageous 
properties are achieved: 
▪ Pronounced increase in the early strength develop- 
ment, resulting in very economic stripping times for 
precast and in situ concrete 
▪ Extremely powerful water reduction, resulting in 
high density, high strength and reduced permeability 
for water etc. 
▪ Superior plasticising effect, resulting in improved 
flowability, placing and compacting behaviour. 
▪ Reduced energy costs for steam cured precast ele- 
ments 
▪ Especially suitable for the production of Self Com- 
pacting Concrete (SCC) Improved shrinkage and 
creep behaviour 
▪ Reduced closure times for repairs to roads and run- 
ways 
▪ Does not contain chlorides or any other ingredients 
which promote the corrosion of steel. It is therefore 
suitable for use in reinforced and prestressed con- 
crete structures. 

Packaging

1000L/tote, 200 L/drum 

Colour

 Light brownish liquid, clear to slightly cloudy 

Product Details

Sustainability / Certifications / Approvals

CERTIFICATES AND TEST REPORTS

Complies with ASTM C494 Type F 
Complies with TIS 73
Product Information

Composition

 Aqueous solution of modified polycarboxylates.

Shelf life

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

Storage conditions

Store in dry conditions, protected from direct sunlight and frost at temper- 
ature between 5°C and 40°C 

Density

 1.070 - 1.090 kg/L (at temperature 25°C) 

pH-Value

3.0 - 5.0 
System information

Compatibility

 Sika® ViscoCrete®-819 Extra is compatible with all types of Portland Ce- 
ment, including S.R.C. type and Hydraulic Cement. 
Important: Always conduct trials before combining products in specific 
mixes and contact our Technical Service Department for information and 
advice about any specific combinations. 

Application

Application Information

Dispensing

▪ Sika® ViscoCrete®-819 Extra is added to the gauging 
water or added with it into the concrete mixer. 
▪ To take advantage of the high water reduction, a wet 
mixing time, which is depending on the mixing condi- 
tions and mixer performance, of at least 60 seconds 
is recommended. 
▪ To avoid excess water in the concrete, the final 
dosage must begin only after 2/3 of the wet mixing 
time.
Consumption

Recommended dosage

 0.3 – 1.0% by weight of cement. 

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