Product Data Sheet Show all documents

Sika® Retarder-50

Set retarding/stabilising admixture

Sika® Retarder-50 is a liquid admixture developed for the control of cement hydration. Sika® Retarder-50 retards/stabilises concrete mixes without negatively influencing their quality.

Sika® Retarder-50 retards/stabilises the hydration of the cement.
  • Strong retardation/stabilising to overcome long haulage distances
  • High resistance to segregation with reduced bleed
  • Extended workability
  • Provides higher ultimate strengths
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Product Data Sheet Show all documents

Usage

Sika® Retarder-50 allows the production of retarded/stabilised concrete.
Sika® Retarder-50 is mainly used for the following applications:
  • A wide range of applications where set retarding/stabilising is requested
 

Advantages

Sika® Retarder-50 retards/stabilises the hydration of the cement.
  • Strong retardation/stabilising to overcome long haulage distances
  • High resistance to segregation with reduced bleed
  • Extended workability
  • Provides higher ultimate strengths

Packaging

18 litres, 200 litre drum, 1000 litre IBC

Colour

Pale Straw Liquid

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

Conforms to the requirements of BS EN 934-2 Table 8
DoP 02 14 02 03 100 0 000030 1088, certified by Factory Production Control Body 0086, Certificate 541325, and provided with the CE mark
Product Information

Chemical Base

Hydrocarboxylate and carbohydrate blend

Shelf Life

12 months from date of production if stored properly in undamaged unopened, original sealed packaging.

Storage Conditions

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

Density

1.22 Kg/Litre (at +20°C)

pH-Value

8.0 +/- 1.0

Total Chloride Ion Content

<0.1% w/w
Technical Information

Specific Advice

Equivalent Sodium Oxide as % Na2O w/w:   <10.0%
 

 

Application

Application Information

Compatibility

Sika® Retarder-50 may be combined with many other Sika products.

Important: Always conduct trials before combining products in specific mixes and contact our Technical Service Department for information and advice about any specific combinations.

Dispensing

  • Sika® Retarder-50 is added to the gauging water or added with it into the concrete mixer.
  • A wet mixing time, which is depending on the mixing conditions and mixer performance, of at least 60 seconds is recommended.
  • When added on site the truck mixer shall rotate its drum at maximum revolutions for at least 1 minute per m³ concrete and a minimum of 5 minutes to achieve a uniform mix.
Consumption

Recommended Dosage

0.2 – 2.0% by weight of cement
Application steps

APPLICATION INSTRUCTIONS

APPLICATION METHOD / TOOLS
 

  • The standard rules of good concreting practice, concerning production and placing, are to be followed.
  • Laboratory trials shall be carried out before concreting on site, especially when using a new mix design or producing new concrete components.
  • Fresh concrete must be cured properly and curing applied as early as possible.

     

NOTES ON APPLICATION / LIMITATIONS
 

  • When using Sika® Retarder-50 a suitable mix design has to be taken into account and local material sources shall be trialled.
  • Sika® Retarder-50 shall not be added to dry cement.
  • Overdosing will result in an increase in setting time. Large overdoses of retarders/stabilisers can produce very long setting times and even small overdoses can have this effect if the initial dose is high.
  • Support from our Technical Service Department is recommended.
  • Frost: If frozen and / or if precipitation has occurred, Sika® Retarder-50 may be used after thawing slowly at room temperature followed by intensive remixing.

CLEANING OF TOOLS

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

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