MasterRheobuild 561 – A superplasticising admixture to produce low slump loss rheoplastic concrete

What is MasterRheobuild 561?

MasterRheobuild 561 is a chloride free, ready-to-use, liquid admixture comprising of synthetic polymers specially designed to impart low slump rheoplastic qualities to concrete. Rheoplastic concrete is a fluid concrete with a slump value of at least 200mm, easily flowing but at the same time free from segregation and having the same water/cement ratio as that of a no-slump concrete without additive.

MasterRheobuild 561 has been formulated to meet the requirements of ASTM C494 Type B, D and G, BS5075 Part 3 and UNI no. 7102, 7104 -72 and 8145 for high range water-reducing admixtures. It is compatible with all cements meeting recognised international standards.

Where does MasterRheobuild 561 work?

  • Mass concrete
  • Ready mixed concrete
  • long distance transport
  • pumped concrete
  • hot weather concreting
  • use with all cements and air-entraining admixtures approved under ASTM, AASHTO, CRD & BSI.

It has been used for:

  • foundation rafts of nuclear power stations, turbo-generators, rolling mills, shipyards and high rise buildings
  • transporting of concrete lasting more than one hour casting structures where concrete is pumped over a distance of more than 200metres or to a considerable height
  • reinforced concrete and prestressed concrete structures in regions where temperatures normally exceed 40°C and relative humidity is low


MasterRheobuild 561: Technical Data Sheet (ref: MY&SG#MasterRheobuild 561 AN v1.0113)

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