Very fine spread coating for repairs of concrete surface

Product Characteristics
One-component dry spread coating containing re-dispersible polymers. Meets the requirements of class R3 according to EN 1504-3

  • designed for concrete repair (principle 3, method 3.1 according to EN 1504-3)
  • mixed with water only
  • good workability
  • perfect adhesion to base
  • permanently water-resistant
  • good mechanical properties
  • cfrost-resistant
  • compensated in volume

DENSOFIX SF is one-component polymer-cement dry mortar mix intended especially for repairs of new monolithic reinforced concrete constructions. It can be also used for sealing of surface damage of concrete constructions or unification and sealing of repaired concrete and reinforced concrete constructions. Spread coating DENSOFIX SF can be coated with any type of secondary protection in dependence on exposure of the repaired structure.

Physical and mechanical parameters

Requirements / results according to EN 1504-3 class R3

Testing method R3 Requirements Results
Compressive strength (MPa) EN 12190 >25 >25
Chloride Ion Content EN 1015-7 <0.05% <0.01%
Adhesive Bond (MPa) EN 1542 >1.5 >1.5
Carbonation Resistance EN 13295 dk ≤ control concrete complies
Restrained shrinkage/expansion (MPa) EN 12617-4 Adhesion after test ≥1.5 >1.5

Physical and mechanical parameters

Colour Non-standard light gray
Bulks density (kg/m3) 1480 ± 50
Bulk density of fresh spreaded coating (kg/m3) 2050 ± 50
Tensile bending strength (MPa) 7 days >0
28 days >5.5
Compressive strength (MPa) 7 days >16
28 days >25
Dynamic E-module (GPa) <25
Thermal expansion coefficient (K-1) 12.5 ± 0.4×10-6
Frost resistance >T150
Adhesion to base (MPa) >1.5

Test certificates
Meets the requirements of EN 1504-3, TP ŘSD Sec. 31 and TP SSBK III. Initial tests types according to EN 1504-3, Protocol No. 1301-CPD-0295 issued by TSÚS Bratislava. Supervision of the quality system, EMS and OHSAS is carried out by Notified Body No. 1020

Instruction for preparation and application.
During the processing of dry mortar mixes DENSOFIX SF it is generally necessary to comply with the principles contained in the relevant technological process BETOSAN for repair of reinforced concrete structures (TP No.1/06).

Base. Any incoherent, loose or weatherworn particles and dust shall be completely removed from the surface of the repaired base. The concrete surface cannot be contaminated by substances negatively affecting adhesion to the base (fats, greases, oils, etc.). Rinsing with pressure water is the best method for necessary complete removal of any dust from the entire repaired surface before application.

Preparation of spread coating. The spread coating is prepared by simple mixing with water. The recommended mixing ratio is as follows:

Dry component (kg) Water (litres) Thickness of applied layer (mm)
DENSOFIX SF 25 4.50 ÷ 5.00 min. 1 max. 3

Workability of the product is 50 – 60 minutes under 20 °C.
Neither temperature of base nor temperature of ambient air shall be below + 5 °C and above + 30 °C.

DENSOFIX SF spread coating is applied either mechanically or manually. Manual application means finning off. The spread coating is applied in one layer whose thickness should not exceed value specified in the above table. Surfaces coated with the spread coating shall be efficiently protected against direct sunshine and wind.

Surface finalization. After initial setting of the spread coating smoothing by a dry polyurethane or polystyrene
finisher is used for surfacing.

Surface treatment. Repaired surfaces must be properly treated immediately after completion to avoid especially direct exposure to sun, wind effect and other factors accelerating undesirable evaporation of the batch water. Use of the following treatment agents DENSOCURE W and DENSOCURE R proved well. It is desirable to properly moisten the repaired places several times a day for min. 7 days following the repair

Specific consumption
Specific consumption of dry mortar is 1.6 to 1.7 kg/m2 at 1 mm of layer thickness.

More info on the product page
DENSOFIX SF (ENG) (pdf, 0.3 MB)