USES
Sika® ViscoCrete®-20 HE PK is particularly effective for concrete mixes requiring high early strength, substantial water reduction, and excellent flowability. It is commonly used for:
- Pre-cast concrete
- Fast-track concrete
- In-situ concrete needing quick stripping times
- Self-Compacting Concrete (SCC)
CHARACTERISTICS / ADVANTAGES
Sika® ViscoCrete®-20 HE PK functions as a powerful superplasticizer through various mechanisms, including surface adsorption and steric effects that separate binder particles. This results in:
- Enhanced early strength development, leading to faster stripping times for pre-cast and in-situ concrete
- Significant water reduction of over 20%, which leads to higher density, strength, and reduced water permeability
- Excellent plasticizing effect, improving flowability and ease of placement and compaction
- Reduced energy costs for steam curing of pre-cast elements
- Ideal for producing Self-Compacting Concrete (SCC)
- Improved shrinkage and creep behavior
- Reduced closure times for road and runway repairs
Sika® ViscoCrete®-20 HE PK does not contain chlorides or other ingredients that may cause corrosion of steel reinforcement, making it suitable for reinforced and pre-stressed concrete.
APPROVALS / STANDARDS
Sika® ViscoCrete®-20 HE PK meets the requirements of ASTM C494, Type F.
PRODUCT INFORMATION
- Chemical Base: Aqueous solution of modified polycarboxylates
- Packaging: 1000 L IBC, 200 L drum, 20 L plastic can, 5 L jerry can, Bulk supply available on request
- Shelf Life: 12 months minimum from production date if stored correctly in unopened packaging
- Storage Conditions: Store in a dry area between 5°C and 35°C, away from direct sunlight
- Appearance / Colour: Light brownish liquid, clear to slightly cloudy
- Specific Gravity: ~1.11 at 25°C
- Solid Content by Weight: > 48%
- pH Value: ~4.3 (+1) at 25°C
- Total Chloride Ion Content: Nil
APPLICATION INFORMATION
- Recommended Dosage:
- For medium workability: 0.2-0.8% by weight of cement
- For high workability, very low water/cement ratio, or Self-Compacting Concrete: 1.0–2.0% by weight of cement
It is recommended to carry out trial mixes to determine the correct dosage.
- Dispensing: Sika® ViscoCrete®-20 HE PK should be added to the gauging water or mixed simultaneously with it in the concrete mixer. For optimal use of its water-reducing properties, a thorough mixing time of at least 60 seconds is recommended.
Compatibility: Sika® ViscoCrete®-20 HE PK can be 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
It is advisable to conduct trial mixes before combining products.
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