weber.rep R4 duo
Polymer-modified concrete substitute mortar R4/M2/PCC > 50 mm and fairing coat mortar 2 - 5 mm
Colours:
concrete grey
Application thickness:
As repair mortar / reprofiling mortar / concrete substitute: unitary layers of 50 mm
As resurfacing mortar / fairing coat mortar: 2 mm - 5 mm
Water demand:
As repair mortar/ reprofiling mortar / concrete substitute: max. 2.9 liters / 20 kg
As resurfacing mortar / fairing coat mortar: max. 3.2 liters / 20 kg
Drying time:
like concrete
Storage:
The product can be stored for at least 9 months in its original unopened packaging if kept dry.
Fields of application
weber.rep R4 duo is used as combination product for use as reprofiling mortar or concrete replacement mortar in thick applications (up to 50 mm and more) and as fairing coat mortar in thin applications (from 2 to 5 mm).
As structural repair mortar for the repair/reprofiling of worn-out reinforced concrete structures (vertical and overhead without formwork).
As resurfacing mortar for levelling and patching all surface imperfections, like honeycombs, small breakouts, voids, broken edges etc. on new and old concrete substrates, such as filigree concrete walls, ceiling elements etc. in structural engineering, and also as fairing coat on repaired concrete surfaces.
Also for provision of inclined slopes up to 50 mm thickness, for ex. cantilever slabs of balconies.
Furthermore, for all repair works on concrete walls and floors, as well as for re-profiling e.g. stair steps. Together with the concrete surface protection systems weber.tec 771 or weber.tec 772, it fulfills the requirements of the guideline of DafStb (German Committee for Structural Concrete) for the protection classes OS-C and OS-D II (DIN V 18026) and OS-4 and OS-5 (ZTV-ING).
For use indoors and outdoors.
Main features
- very good workability
- no drop-off on vertical and overhead surfaces
- very high mechanical strengths
- high resistance to frost and de-icing salts
- low shrinkage and low residual stress
- very fine-grained - maximum grain size 0.5 mm
- open to diffusion of water vapour
- for surfaces with pedestrian and vehicular traffic
- approved by the German Federal Road Authority
General notes
- Limits of use: do not use weber.rep R4 duo for lightweight blocks or bricks and on large-size horizontal concrete surfaces.
- All characteristics mentioned in this data sheet are given for a temperature of +20 °C without draught and a relative humidity rate of 60%.
- Avoid exposure to frost and to excessive sunlight and draughts in order to protect from too rapid drying out (dehydration).
- When used as concrete replacement keep the mortar moist during at least 3 days by covering with polyethylene foils, textile membranes and protect from frost.
- Do not spray water on freshly applied surfaces.
- Do not add any foreign substances during mixing and application.
Special notes
- In case of existing concrete cover > 20 mm resp. > 40 mm, depending on the exposure classes (EN 206) the use of the corrosion protection weber.rep KB duo is not necessary.
- For application in layers up to approx. 25 mm thickness beyond the scope of EN 1504 (i.e. in static not-relevant areas, where the standard EN 1504 is not requested) weber.rep R4 duo can be used as bondcoat instead of weber.rep KB duo. For this purpose, mix weber.rep R4 duo in brush consistency and apply it with a block brush on the dull-moist substrate; afterwards apply the mortar mixed in trowel consistency onto the fresh bondcoat up to 25 mm thickness.
- For applications beyond the scope of EN 1504 the use of a bondcoat is not necessary; in further cases with concrete covers > 20 mm the use of a corrosion protection is not necessar as well. In such cases, first apply weber.rep R4 duo as pore-sealing slurry coat by block brush or as scratch layer by flat trowel onto the dull-moist concrete surface; afterwards apply weber.rep R4 duo in the required thickness “wet-in-wet” onto the fresh previous layer.
- For an increased carbonation protection use the Weber protection system weber.tec 771 or weber.tec 772.