Sulphate Resistant High Build Structural Grade Concrete Repair Mortar R4

VELOSIT SR 207 is a Sulphate-resistant, structural grade cementitious repair mortar for concrete restoration acc. to EN 1504-9. It is used to fill large voids or build up larger cross-sections up to 100 mm (4”) specifically designed for repairs in sewage and waste water structures.

Typical applications:

  • Repair of large surface defects on in concrete manholes, primary & secondary sewage treatment basins and waste water treatment plants
  • Overlays and repairs on concrete structures like dams, bridges, beams, balconies, facades
  • Application Suitable on horizontal, and vertical incl. overhead applications
  • Application thickness from 6 mm (¼“) to 100 mm (4”)
  • Used as micro-concrete


  • Minimal shrinkage/expansion under dry resp. wet curing conditions minimizing the risk of micro-cracking
  • Excellent workability
  • Wide range of water addition to meet different workability requirements 
  • Fiber reinforced with grain sizes reaching 4 mm
  • Hydrophobic
  • Advanced corrosion inhibitor technology
  • 30 min. working time and 12 MPa (1740 psi) compressive strength after 4 hours
  • Final strength exceeds 45 MPa (6525 psi) after at 28 days
  • Open to foot traffic after 3-4 hours
  • Excellent adhesion to properly prepared concrete
  • Good resistance against CO2 and Chloride penetration due to a very tight pore structure
  • Good resistance against aggressive media with a pH range of 3-12 and against soft water with low ion content
  • Good weathering resistance
  • Good sulfate sulphate resistance
  • Light gray grey color close to that of concrete

Associations & Memberships:

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