MasterRheobuild 840 - A high range, water-reducing superplasticiser for rheoplastic concretes 

Formerly Rheobuild 840


MasterRheobuild 840 is formulated from synthetic polymers specially designed to impart rheoplastic qualities to concrete. A rheoplastic concrete is a fluid concrete, easily flowing; but at the same time free from segregation and bleeding having the same w/c ratio as that of a low slump concrete without admixture, with a slight set retarding effect for producing free-flowing concrete in hot climates. Also, it provides a substantial water reduction effect for promoting high, early and ultimate strengths. MasterRheobuild 840 is chloride-free. 

Where is MasterRheobuild 840 applied?

  • Microsilica concrete 
  • Mass concrete pours 
  • Ready-mixed concrete
  • Long-distance transport
  • Pumped concrete 
  • Casting in hot climates

What are the advantages of MasterRheobuild 840?

  • Reduced thermal peaks 
  • 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 840 MSDS

pdf (164,02 Kb)

MasterRheobuild 840 TDS

pdf (348,78 Kb)