Slump is a measure of consistency or wetness of freshly mixed concrete.

• Dry Slump (20 to 50mm)
  (giving very low shrinkages due to reduced water content, difficult to work with)
• Normal Slump (60 to 100mm)
  (giving suitable workability for standard class applications)
• High Slump (110 to 160mm)
  (for improved pumpability, for ease of placement, labor savings - will affect final strength of concrete)