Product Data Sheet Show all documents

Sikament® R-7 N

Water Reducing and Set Retarding Concrete Admixture

A concrete plasticizer and retarder based on modified lignosulfonates used to produce good quality concrete.
Complies with ASTM C494 Type D.

  • Only set retarding, does not delay the hardening process;
  • Allow cement reduction compared to plain concrete;
  • Increase in ultimate strength;
  • Good control of slump loss even at elevated ambient temperature;
  • Reduced shrinkage and creep;
  • Chloride free, does not attack reinforcement steel.
Product Data Sheet Show all documents

Usage

Sikament® R-7 N is used in concrete where longer setting times and improved workability are required, such as projects with:
  • Large pours, to prevent formation of cold joints;
  • Long travel times from the concrete plant to the site;
  • On site mixing;
  • High ambient temperature.
 

Advantages

  • Only set retarding, does not delay the hardening process;
  • Allow cement reduction compared to plain concrete;
  • Increase in ultimate strength;
  • Good control of slump loss even at elevated ambient temperature;
  • Reduced shrinkage and creep;
  • Chloride free, does not attack reinforcement steel.

Packaging

5 / 25 L pail

Colour

Liquid / Brown

Product Details

Product Information

Chemical base

Blend of Lignosulfonates

Shelf life

Min. 1 year if stored properly in original unopened packaging

Storage conditions

Dry, cool, shaded place

Density

1.125–1.145

Total Chloride Ion Content

Nil
Technical Information

Specific Advice

All Portland cement including sulfate resistant cement

 

Application

Application Information

Compatibility

Possible to combine with all Sikament®, Sika® Aer, Sika® Pump, Sikacrete® PP-1, but must be added separately to the mix and not pre-mixed prior addition.

DISPENSING

Sikament® R-7 N is either added to the gauging water prior to its addition to the dry concrete mix or added separately to wetted concrete mix, further mixing should take place for at least 1 minute per m3.
Consumption

Recommended Dosage

0.3–0.8 L per 100 kg of cement (depend on cement type & brand)
Typical dosage: 0.4–0.6 L per 100 kg of cement

Overdosing: When overdosed, setting time will be extended, depending on cement content and temperature. Final strength will be not impaired.
Note: Due to extended setting time, proper curing must be ensured. Do not vibrate green concrete or tamper embedded rebars whilst setting.

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