MasterRheobuild 859 - A high range, water-reducing superplasticiser for concretes containing GGBS and microsilica 


MasterRheobuild 859 is formulated from synthetic polymers specially designed to impart rheoplastic qualities to concrete, particularly those containing GGBS and microsilica. 

A rheoplastic concrete is a fluid concrete with a slump of at least 200mm, easily flowing, but at the same time free from segregation and having the same w/c ratio as that of a low slump concrete (25mm) without admixture. 

MasterRheobuild 859 is chloride-free

Where is MasterRheobuild 859 applied?

  • Mixes containing GGBS or microsilica
  • Mass concrete pours 
  • Ready-mixed concrete 
  • Pumped concrete 
  • Casting in hot climates 

What are the advantages of MasterRheobuild 859?

  • High workability for longer periods 
  • Lower pumping pressure 
  • Delayed setting with longer workability 
  • Higher ultimate strengths 
  • Reduced permeability 
  • Improved durability 

Product Information

Technical Data Sheet


MasterRheobuild 859 MSDS

pdf (171,99 Kb)

MasterRheobuild 859 TDS

pdf (112,46 Kb)