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Sikament® RB 644

(former MRheobuild 644)

HIGH RANGE WATER-REDUCING SUPERPLASTICING ADMIXTURE FOR THE PRODUCTION OF RHEOPLASTIC CONCRETE

Sikament® RB 644  is a high range, chloride free, water reducing superplasticiser with effective dual action, used for high workability concrete as well as a substantial water reducer. Sikament® RB 644 is suitable for use in hot and tropical climatic conditions.

  • Low water/cement ratio concrete.
  • In complicated formwork or with congested reinforcement.
  • Concrete requiring long slump retention period
  • Walls, columns and piers
  • Slabs
  • Foundations
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Usage

Sikament® RB 644 allows the production of a flowable concrete, with low water / cement ratio. Concrete with Sikament® RB 644  shows strengths higher than concrete without admixture having the same workability. Due to the reduction in the water / cement ratio, all other properties of hardened concrete improve significantly, namely; lowered permeability, shrinkage and creep, increased workability and modulus of elasticity.  

Advantages

  • Low water/cement ratio concrete.
  • In complicated formwork or with congested reinforcement.
  • Concrete requiring long slump retention period
  • Walls, columns and piers
  • Slabs
  • Foundations

Packaging

210 L drum, 1000 L flowbin or bulk supply in tanker

Colour

Dark brown liquid.

Product Details

Sustainability / Certifications / Approvals

CERTIFICATES AND TEST REPORTS

Sikament® RB 644 follows the requirements of ASTM C494; Type A, F & G. BS EN 934-2
Product Information

Composition

Sulphonated napthalene

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 +45°C. Protect from direct sunlight. Mix well before using.

Density

~1.17 kg/l (+25°C)

Total chloride ion content

Nil 

(BS EN 934-2)

 
Technical Information

Concreting guidance

The standard rules of good concreting practice for production and placing must be observed when using Sikament® RB 644 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

Compatibility

Sikament® RB 644 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 Sikament® RB 644with the above products or other admixtures, Sikament® RB 644 should not be premixed with any other admixtures. If other admixtures are to be used, those should be dispensed
separately. Please consult our Sika Technical Department for further assistance.

Dispensing

Sikament® RB 644 is a ready-to-use admixture to be added to the concrete as a separate component. Optimal result is obtained if Sikament® RB 644 is poured into the concrete mix right after the addition of the first 

70 % of the mixing water, i.e. when all solids are wetted. Avoid adding the admixture to the dry aggregates. Alternatively, when using Sikament® RB 644 to produce flowing concrete at site using ready mix trucks, it can be added to the concrete via the feed hopper at the rear of the truck. Mix before discharge for 3 minutes at 10 rpm to produce a fully homogenous mix.
Consumption

Recommended dosage

Sikament® RB 644 is normally dispensed at a rate of 0.5 – 2.5 Iitres per 100 kg of the binder. Other dosages may 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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