​MasterRheobuild 857K - High range water reducing superplasticiser

What is ​MasterRheobuild 857K?

MasterRheobuild 857K is formulated from synthetic polymers specially designed to impart rheoplastic qualities to concrete. 
A rheoplastic concrete is a fluid concrete with a slump of at least 200 mm, easily flowing, but at the same time free from segregation and having the same water/cement ratio as that of a low slump concrete (25mm) without admixture. MasterRheobuild 857K is chloride free.  

What is ​MasterRheobuild 857K used for?

MasterRheobuild 857K considerably improves the properties of fresh and hardened concrete.

What are the benefits of ​MasterRheobuild 857K?

Mixes containing GGBS or microsilica
• Mass concrete pours
• Ready mixed concrete
• Pumped concrete
• Casting in hot climates
To obtain:
• High workability for longer periods
• Lower pumping pressure
• Delayed setting with longer workability
• Higher ultimate strengths
• Reduced permeability
• Improved durability


MasterRheobuild 857K_TDS

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