RHEOBUILD 650 is a high range superplasticising admixture designed specifically for the production of rheoplastic concrete. Unlike conventional superplasticisers RHEOBUILD 650 possesses the ability to retain workability for extended periods even in high temperatures.
- Readymixed concrete.
- Low water / cement ratio and high strength concrete .
- Microsilica concrete
- High workability for longer periods .
- Casting in hot climates.
- Effective over high range of cement contents and types.
- Improves pumpability , durability and impermeability .
- Extended slump retention time –maintains workability in excess of concrete produced utilising conventional superplasticisers .
- Enables Rheoplastic, workable microsilica concrete.
- Chloride-free, suitable for use with reinforced concrete.
RHEOBUILD 650 is available in bulk or in 210 Ltr drums.
RHEOBUILD 650 can be used with all types of Portland cement. For use with special cements, contact BASF's Technical Services Department .
RHEOBUILD 650 should not be premixed with other admixtures . If other admixtures are to be used in the concrete containing RHEOBUILD 650, they must be dispensed separately . Contact BASF's Technical Services Department for further advice.
BS 50 75 Part 1
ASTM C494 Types D & G
RHEOBUILD 650 is normally dispensed at a rate of 0.6-1.5 litres per 100kg of cement depending on water reduction percent. Other dosages may be required depending on the specific working conditions and mix design. In particular higher dosages can be required to maintain longer workability, especially in hot climates.
RHEOBUILD 650 is a ready to use liquid which is dispensed into the concrete together with the mixing water.
The palsticising effect and water reduction are higher if the admixture is added to the concrete after 70% of the mixing water has been added. The addition of RHEOBUILD 650 to dry aggregate or cement is not recommended.
- Increased workability
- Retardation of initial and final set.
- Increased air entrainment
Providing the concrete is correctly placed and cured the ultimate compressive strength will not be adverserly affected . The effects of over dosage are increased in sulphate resisting cement (type V).
Store under cover , out of direct sunlight and protect from extremes of temperature. Shelf life of 2 years when stored as above.