Product Data Sheet Show all documents

Sika® ViscoCrete®-25 MP (GB)

Accelerating High Range Water Reducing/Superplasticising Concrete Admixture

Sika® ViscoCrete®-25 MP (GB) is based on unique polycarboxylate polymers technologies. Sika® ViscoCrete®-25 MP (GB) is a liquid admixture for concrete which is used as an accelerating high range water reducer or superplasticiser. The product provides fast adsorption resulting in highly efficient dispersion and potential reduction in mixing time. It meets the requirements of BS EN 934-2.

  • Quick mixing
  • Ideally suited for use in SCC and flowing concretes
  • High water reductions resulting in higher strengths and densities
  • Reduced permeability
  • Fast strength development
  • Improved flow
  • Reduced shrinkage and creep
  • Advantages in mix cost savings
  • Precast energy savings
  • Consistent performance of the concrete
  • Chloride free
  • Extended consistence retention
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Product Data Sheet Show all documents

Usage

  • Sika® ViscoCrete®-25 MP (GB) is a unique product that is suitable for the production of ready mixed concrete as well as precast operations.
  • Application that requires excellent workability and
  • early strength development.
  • Concrete with high water reduction to meet low w/c
  • ratio requirements
  • High performance concrete
  • Self-compacting concrete
  • Concrete containing crushed rock fines
   

Advantages

  • Quick mixing
  • Ideally suited for use in SCC and flowing concretes
  • High water reductions resulting in higher strengths and densities
  • Reduced permeability
  • Fast strength development
  • Improved flow
  • Reduced shrinkage and creep
  • Advantages in mix cost savings
  • Precast energy savings
  • Consistent performance of the concrete
  • Chloride free
  • Extended consistence retention

Packaging

20 litre drum, 1000 litre IBC

Colour

Clear straw

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

Conforms to the requirements of BS EN 934-2 Tables 3.1 & 3.2
Product Information

Chemical Base

Modified polycarboxylate

Shelf Life

12 months from date of production if stored properly in undamaged containers.

Storage Conditions

Store in dry conditions at temperatures between +5°C and +25°C. Protect from direct sunlight and frost.

Specific Gravity

1.065 kg/l (at +20°C)

pH-Value

Awaiting further testing

Total Chloride Ion Content

Awaiting further testing
Technical Information

Specific Advice

Freezing Point: +1°C

Air Entrainment:  Negligible, normally a minimal increase

Effect on Setting:  Slight extension to normal setting at 0.2% dose, normal setting up to 0.4% dose and accelerated setting at higher dosages due to its chemical nature.

Effect of Overdosing:  Increased workability and segregation

Alkali Content:  Awaiting futher testing

Application

Application Information

Compatibility

Sika® Admixtures:

  • All Sika admixtures can be considered
  • Trial mixes should always be carried out to determine performance in-situ

Cements:

  • All cements including replacements

Dispensing

Sika® ViscoCrete®-25 MP (GB) is added to the gauging water at the plant or added on-site into the concrete mixer. A minimum of sixty seconds mixing time is required to ensure the full effect of the product performance.
Consumption

Recommended Dosage

0.2 -0.8% by weight of cement for medium workability
1.0-2.0% by weight of cement for special applications such as self compacting or ultra high strength concrete.
Application steps

APPLICATION INSTRUCTIONS

Application Method/Tools
 

The standard rules of good concreting practice, concerning production as well as placing, are to be followed. Refer to relevant standards. Fresh concrete must be cured properly.
 

Cleaning of Tools
 

Clean all tools and application equipment immediately after use. Hardened / cured material can only be mechanically removed.
 

Notes on Application/Limitations
 

  • When using Sika® ViscoCrete®-25 MP (GB) a suitable mix design is required and local material sources should be trialled.
  • If frozen and/or if precipitation has occurred, Sika® ViscoCrete® Ultra (GB) may be used after thawing slowly at room temperature and after intensive mixing.
  • Sika® ViscoCrete®-25 MP (GB) should not be added to dry cement.
  • Sika® ViscoCrete®-25 MP (GB) should be added with the mixing water or introduced at the end of the mixing process.
  • Before application, suitability tests must be performed.
  • Support from our Technical Department is recommended.

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