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Sika® ViscoCrete®-8800 EX

HIGH PERFORMANCE SUPERPLASTICIZER FOR PRECAST CONCRETE

Sika® ViscoCrete®-8800 EX is a third generation superplasticizer for high performance concrete particularly formulated for the production of precast element, targeting its special demands regarding slump retention, very low water/binder ratios, use of double or triple blend mixes (cement, GGBFS, PFA and/or microsilica) and high degree of compaction.
Sika® ViscoCrete®-8800 EX is especially suitable for use in Steel Fiber Reinforced Concrete (SFRC) and concrete mixes containing polypropylene fibers for fire protection as commonly used in precast concrete tunnel segment production.
Suitable for use in hot and tropical climatic conditions.

Sika® ViscoCrete®-8800 EX works as a powerful superplasticizer acts by different mechanisms. Through surface adsorption and steric hinderance effects separating the binder particles which results in higher dispersion allows the possibility to work with very low water/binder ratios by avoiding the high stickiness common to such kinds of mix. The following properties are achieved:
  • Easier to control during casting due to sufficient retention period and high early strength development
  • High water reduction (resulting in high density and strengths) even in double or triple blend mixes (e.g. cement, GGBS, and silica fume)
  • Low w/b ratio leads to very low water permeability, and chloride migration
  • Increased high early strength and strength development even with the use of low cement content mixes
  • Improved shrinkage and creep behavior
  • Excellent flowability resulting in minimal placing and compacting efforts leading to much denser concrete
  • Does not contain chlorides or other steel corrosion promoting ingredients therefore may be used for reinforced and pre-stressed concrete construction
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Usage

Sika® ViscoCrete®-8800 EX facilitates extreme water reduction, with optimum cohesion and workability as required, just by adjusting the dosage. It is used mainly to the following types of concrete:
  • Precast concrete tunnel segments
  • Precast concrete in general
  • Pre-stressed concrete elements
  • Post-tensioned concrete bridge segments
  • Fast track concrete
  • In situ concrete that requires fast stripping time
  • Mixes containing Steel Fiber Reinforced Concrete (SFRC), synthetic fibers and polypropylene fibers for structural and / or fire resistant concrete
  • Concrete with high water reduction that requires high workability, slump retention along with high early strength development
 

Advantages

Sika® ViscoCrete®-8800 EX works as a powerful superplasticizer acts by different mechanisms. Through surface adsorption and steric hinderance effects separating the binder particles which results in higher dispersion allows the possibility to work with very low water/binder ratios by avoiding the high stickiness common to such kinds of mix. The following properties are achieved:
  • Easier to control during casting due to sufficient retention period and high early strength development
  • High water reduction (resulting in high density and strengths) even in double or triple blend mixes (e.g. cement, GGBS, and silica fume)
  • Low w/b ratio leads to very low water permeability, and chloride migration
  • Increased high early strength and strength development even with the use of low cement content mixes
  • Improved shrinkage and creep behavior
  • Excellent flowability resulting in minimal placing and compacting efforts leading to much denser concrete
  • Does not contain chlorides or other steel corrosion promoting ingredients therefore may be used for reinforced and pre-stressed concrete construction

Packaging

1000 L flowbin. Bulk supply in tanker trucks possible on request

Colour

Light brown liquid

Product Details

Sustainability / Certifications / Approvals

CERTIFICATES AND TEST REPORTS

Sika® ViscoCrete®-8800 EX follows the requirements of ASTM C494; Type F and EN 934-2

 
Product Information

Composition

Aqueous solution of modified polycarboxylates, co-polymers

Shelf life

12 months from date of production if stored properly

Storage conditions

Store in undamaged, unopened, original sealed packaging in dry conditionsat temperatures between +5°C and +50°C. Mix well before using.

Density

~1.1 kg/l (+25°C)

Total chloride ion content

Nil

(EN 934-2)
Technical Information

Concreting guidance

The standard rules of good concreting practice for production and placing must be observed when using Sika® ViscoCrete®-8800 EX in concrete. Refer to relevant standards.
Fresh concrete must be cured properly especially at high temperatures in order to prevent plastic and drying shrinkage. Use Sika® Antisol® products as a curing agent or apply wet hessian.

Application

Application Information

Dispensing

Sika® ViscoCrete®-8800 EX is added to the gauging water or simultaneously poured with it into the concrete mixer at the batching plant.
Do not add Sika® ViscoCrete®-8800 EX directly to the dry mix. For optimum utilization of its high water reduction property we recommend thorough mixing at a minimal wet mixing time of 60 seconds. The addition of the remaining gauging water (to fine tune concrete consistency) may only be started after two-thirds of the wet mixing time to avoid surplus water in the concrete.

Compatibility

Sika® ViscoCrete®-8800 EX is suitable for mixes containing all types of cement and supplementary cementitious materials such as: Microsilica (Silica Fume), Fly Ash (PFA), GGBS (ground granulated blast furnace slag) and the following Sika products:
▪ SikaPump®
▪ Sika® FerroGard®
▪ SikaFume®
▪ SikaFiber®
▪ Sika® Aer
▪ Sika® Stabilizer
▪ SikaControl®
We recommend to perform trial mixes to establish the required performance when combining Sika® ViscoCrete®-8800 EX with the above products or other admixtures. Please consult our Sika Technical Department.

 
Consumption

Recommended dosage

0.8 – 1.5 % by weight of binder
Dosages outside of these ranges can be used depending on the mix design, raw materials, climatic conditions and concrete requirements. Trial mixes must be performed to establish the exact dosage rate required.

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