​​​​​​​​Sikament® RB 561 (formerly known as MasterRheobuild® 561) - 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.

How does MasterR​​heobuild 561 work?

MasterRheobuild 561 is specially designed to impart low slump rheoplastic qualities to concrete. It ensures that the rheoplastic concrete remains workable for up to 3 hours at 20°C and 1 hour at 40°C. The workability loss depends not only on temperature, but also on the type of cement, the nature of the aggregates and the method of transportation.

It is chloride-free and meets the requirements of:

• ​ASTM C494 Type B, D and G
  
• BS5075 Part 3 
• UNI no. 7102, 7104 ​- 72 and 8145 for set retarding or high range water reducing/superplasticizing admixtures.
  

What makes Master​​Rheobuild 561 a unique solution?

Rheoplastic concrete is fluid concrete, 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 admixture. MasterRheobuild 561 is compatible with all cement, meeting recognised international standards​.

​​Where is MasterRheobuild 561 recommended for?

​​MasterRheobuild 561 recommended uses include: 

• Mass concrete
  
• Ready-mix concrete
  
• Long distance transport
• Pumped concrete
• Hot weather concreting 
• Use with all cements and air-entraining admixtures approved under ASTM, AASHTO, CRD and BSI
  

MasterRheobuild 561 has been used for: 

• 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 200 metres or to a considerable height
• Reinforced concrete and prestressed concrete structures in regions where temperatures normally exceed 40°C and relative humidity is low
  

How can you benef​​it from MasterRheobuild 561?

The benefits of MasterRheobuild 561 include: 

• ​Very high workability - Short placement time, saving on time and labour
• High water reduction - High impermeability and strength; improves durability
• Compatibility - MasterRheobuild 561 is compatible with both water reducers and air-entraining agents approved under ASTM specifications
• Superior cohesion - No segregation even at high workability, providing excellent concrete quality
• Low shrinkage and creep - Better dimensional stability​​​​​​

Download the MasterRheobuild 561 Technical Data Sheet

Explore other admixture solutions for high-strength concrete

MasterRheobuild 800 - High range water reducing admixture​

MasterRheobuild 808 - Optimised superplasticising admixture for producing rheoplastic concrete

MasterRheobuild 1000 - A superplasticising admixture that contains a sulphonated polymer

MasterRheobuild ​​1100 - High range water reducing, superplasticiser for rheoplastic concrete