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Sikament® RB 858 KW

(formerly MRheobuild 858KW)                                                                                                                                                                                                                                                                                            HIGH RANGE WATER-REDUCING AND SLUMP RETAINING CONCRETE ADMIXTURE

Sikament® RB 858 KW is a highly effective dual action liquid superplasticiser that imparts excellent slump retention for prolonged periods. The product is 
chloride free. Suitable for use in hot and tropical climatic conditions.

Sikament® RB 858 KW provides the following properties:
As a Superplasticiser:  
▪ Workability is greatly improved  
▪ Concrete is placed easily  
▪ Especially suitable for slender components with  
densely packed reinforcement  
▪ Concrete requires less vibrating  
▪ Improved cohesion of the concrete mix significantly  
reduces the risk of segregation and allows greater  
time for placement
As a Water Reducer:  
▪ Impressive water reduction capability  
▪ Final strength improvement
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Usage

Sikament® RB 858 KW can be used as a superplasticizer for the production of free flowing concrete for:  
▪ Slabs  
▪ Foundations  
▪ Walls  
▪ Columns  
▪ Piers 
▪ Piles  
▪ Slender components with dense reinforcement  

Advantages

Sikament® RB 858 KW provides the following properties:
As a Superplasticiser:  
▪ Workability is greatly improved  
▪ Concrete is placed easily  
▪ Especially suitable for slender components with  
densely packed reinforcement  
▪ Concrete requires less vibrating  
▪ Improved cohesion of the concrete mix significantly  
reduces the risk of segregation and allows greater  
time for placement
As a Water Reducer:  
▪ Impressive water reduction capability  
▪ Final strength improvement

Packaging

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

Colour

Dark brown liquid

Product Details

Sustainability / Certifications / Approvals

CERTIFICATES AND TEST REPORTS

Sikament® RB 858 KW follows the requirement of ASTM C-494 Type G and EN 934-2
Product Information

Composition

Sulphonated naphthalene blend

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 and frost. Mix well before using.

Density

~1.23 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 Sikament® RB 858 KW 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

Sikament® RB 858 KW is added to the gauging water or simultaneously poured with it into the concrete mixer at the batching plant. Do not add Sikament® RB 858 KW 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

Sikament® RB 858 KW 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 858 KW with the above products or other admixtures. Please consult our Sika Technical Department.
Consumption

Recommended dosage

0.8 - 2.5 % by weight of binder.
Higher 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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