Two-component fine spread for concrete surface sealing and finalization

Product Characteristics
Two-component composition consisting of dry inorganic based component and modified styreneacrylate dispersion. Meets the requirements of EN 1504-3

  • designed for concrete repair (principle 3 and 3.1 according to EN 1504-3)
  • supplied in specified rate of components, good workability
  • excellent adhesion to concrete base
  • permanently water-resistant
  • applied manually or by spraying
  • good mechanical properties
  • frost-resistant

DENSOCRETE 555 is a two-component polymer-cement mortar composition for surface repair of new monolithic reinforced concrete structures. Meets the requirements of class R3 according to EN 1504-3.
DENSOCRETE 555 mortar composition is suitable for sealing damaged surfaces of reinforced concrete structures and also for surface unification and sealing of concrete and reinforced concrete structures repaired with MONOCRETE repair mortars. DENSOCRETE 555 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
Bound contraction-expansion (MPa) EN 12617-4 Adhesion after test >1.5 >1.5

Physical and mechanical parameters

Colour Non-standard grey
Bulk density of dry component (kg/m3) 1520 ± 40
Bulk density of fresh spread (kg/m3) 1800 ± 40
Tensile bending strength (MPa) 28 days >8.5
Compressive strength (MPa) 28 days >38
Frost resistance >T150
Adhesion to base (MPa) >2.0

Test certificates
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 DENSOCRETE 555 it is generally necessary to comply with the principles contained in the relevant technological process BETOSAN for repair of reinforced concrete structures (TP n.1/06).

Base Any incoherent, loose, weatherworn or otherwise visibly damaged concrete shall be completely removed from the repaired concrete surface before application. The concrete surface cannot be contaminated by substances negatively effecting adhesion to the base (fats, greases, oils, etc.). Tensile strength of concrete surface layers shall be 1.5 MPa at least. The base must be perfectly moistened before the application of spread. Extremely absorbent substrates can be cured with DENSOCURE 222 penetration agent.

Preparation of the spread DENSOCRETE 555 is prepared in a container of sufficient size by mixing both components well (preferably by electrically driven propeller agitator) in ratio: 25 kg of dry component, 4 litres of liquid component and 2 litres of water. A low-speed mixer with forced circulation is necessary for mixing. Consistency can be adjusted by adding up to 10% water, if needed.

Dry component Liquid component (litres) Water (litres) Thickness of applied layer (mm)
DENSOCRETE 555 25 4 2 min. 1 max. 3

Workability. Workability of the prepared spread is 60 minutes under 20 °C and relative humidity 50-70%. The prepared composition shall be suitably protected against desiccation.
Neither temperature of the base nor temperature of ambient air shall be below + 5 °C and above
+ 30 °C.

Spread application. It is necessary to thoroughly moisten the base (see above) before application of. DENSOCRETE 555 spread is applied mechanically or manually. Manual application means finning off, preferably with a notched trowel. Spread is applied one layer, whose thickness should be between 1 and 3 mm. Surfaces coated with the spread coating shall be efficiently protected against direct sunshine and wind.

Surface finalization is performed right after the spread application with steel finisher or a semi-hard bristle brush.

Surface treatment. Repaired surfaces shall 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. It is necessary to properly moisten the repaired places several times a day at least first 3 days after the repair. Use of a DENSOCURE W treatment agent proved well.

Tools shall be cleaned with water right after completion. Hardened spread can be removed only mechanically.

Specific consumption
Specific consumption of the spread is: 1.8÷2.0 kg/m2 on 1 mm of layer thickness.

More info on the product page
DENSOCRETE 555 (ENG) (pdf, 0.3 MB)