Concrete Repair

Builda Rep S42

High Strength Concrete Repair Mortar

Single-component high strength cement-based repair mortar for structural concrete repairs.

  • One-component, add water only
  • Protects rebars from corrosion
  • Applied up to 30 mm per lift
  • High abrasion and sulphate resistance

Surface Preparation

Repair area should be sound, clean and uncontaminated. Cut damaged areas to at least 10 mm depth and remove dust, unsound material, paint, grease and laitance

Rebar Priming

Clean exposed reinforcement and coat with Zinc Rich Primer immediately after cleaning

Concrete Priming

Generally substrate priming is not necessary. Soak substrate to saturated surface dry condition before installation

Mixing

Mix powder with recommended clean water to achieve a thixotropic paste suitable for trowel or spray application

Application

Apply by hand troweling or low-pressure spraying, avoiding feather edges

  • Parking and bridge structures
  • Exterior and interior concrete repairs
  • Pre-cast vertical concrete repairs
  • Parapet walls, docks, piers and wharfs

Property
Value
Applicable standards
ASTM C579, C580, C469, EN 1015-17
Physical state
Powder
Color
Cement Grey
Required water per 20kg bag
Approx. 2.5-3.5 L
Wet density
2100 Kg/m3
Consistency of mix
Thixotropic paste
Application temperature
+5°C to +35°C
Workability @ 25°C
30 minutes
Compressive strength
1 day 20 N/mm2 / 7 days 29 N/mm2 / 28 days 48 N/mm2
Flexural strength 28 days
1150 psi (9 MPa)
Adhesion to concrete @ 28 days
3600 psi
Water absorption
2%
Chloride ion content @ 28 days
385 coulombs