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Sika® ViscoCrete® GL 121

(former MGlenium 121)

Water reducing and retarding superplasticizing admixture for concrete

Sika® ViscoCrete® GL 121 is part of a range of latest generation superplasticizers engineered for ready-mix concrete.
Sika® ViscoCrete® GL 121 is based on unique polymers with long lateral chains. This greatly improves cement dispersion. At the start of the mixing process the same electrostatic dispersion occurs but the presence of the lateral chains, linked to the polymer backbone, generate a steric hindrance which stabilises the cement particles capacity to separate and disperse. This mechanism provides flowable concrete with greatly reduced water demand.
Suitable for use in hot and tropical climatic conditions.

Sika® ViscoCrete® GL 121 provides the following beneficial properties:
  • Substantial improvement in workability without increased water
  • Low risk of segregation
  • Normal set without retardation (within the dosage limit)
  • Improved density and surface finish
  • Improved water tightness
  • Excellent solution for continuous concrete casting of deep elements
  • Does not contain chlorides or other steel corrosion promoting ingredients
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Usage

  • Ready mixed concrete
  • High flow concrete
  • Concrete with high water reduction
  • Slabs
  • Foundations
  • Walls
  • Columns and piers
  • Piles
  • Pre-stressed concrete
  • Bridges and cantilever structures
 

Advantages

Sika® ViscoCrete® GL 121 provides the following beneficial properties:
  • Substantial improvement in workability without increased water
  • Low risk of segregation
  • Normal set without retardation (within the dosage limit)
  • Improved density and surface finish
  • Improved water tightness
  • Excellent solution for continuous concrete casting of deep elements
  • Does not contain chlorides or other steel corrosion promoting ingredients

Packaging

1,000 L flowbin or bulk supply in tanker

Colour

Light to dark brown liquid

Product Details

Sustainability / Certifications / Approvals

CERTIFICATES AND TEST REPORTS

Sika® ViscoCrete® GL 121 follows the requirements of ASTM C494; Type G 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 conditions at temperatures between +5°C and +50°C. Mix well before using.

Density

~1.06 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® GL 121 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® GL 121 is a ready-to-use admixture to be added to the concrete as a separate component. Optimal result is obtained if Sika® ViscoCrete® GL 121 is poured into the concrete mix right after the addition of the first 80% of the mixing water, i.e. when all solids are wetted. Avoid adding the admixture to the dry aggregates.

Compatibility

Sika® ViscoCrete® GL 121 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® GL 121 with the above products or other admixtures. Please consult our Sika Technical Department.
Consumption

Recommended dosage

0.8 - 2.5 % by weight of binder
Other dosages by weight of binder 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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