Viscosity Modifying (+ consistence controlling)

Definition EN 934 Part 2:

Viscosity modifying admixtures (VMA) for Self-compacting concrete …

Self-compacting concrete (SCC) is a very high fluidity concrete that uses special mix designs and superplasticizers. With a low fines content in the concrete it may also require a Segregation Control or Viscosity Modifying admixture (VMA) to prevent settlement within the mix.