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DEKGUARD ELASTIC

A high performance crack accommodating elastomeric acrylic protective and decorative coating for concrete and masonry.

Uses:

To protect atmospherically exposed reinforced concrete structures from attack by acid gases, chloride ions, oxygen and water, especially where there is a danger of subsequent cracks appearing within the substrate. The product is also suitable to protect other cementitious substrates and masonry. Dekguard Elastic is suitable for use on all types of structures, including those in coastal environments. It is equally suitable for new and existing structures. Dekguard Elastic is a component of Fosroc’s Renderoc system of concrete reinstatement.

Advantages:

  • Can accommodate substrate cracking up to 6mm and cyclic movement up to 1mm
  • True elastomeric coating with excellent elongation and recovery properties which are maintained at sub-zero temperatures
  • Excellent barrier to carbon dioxide, chloride ions, oxygen and water
  • Special acrylic polymer minimises dirt retention
  • Allows water vapour to escape from the structure
  • UV-resistant with high resistance to the effects of long term weathering
  • Water-based
  • Wide range of decorative colours

Description:

The Dekguard Elastic system comprises a single component penetrating primer and a single component elastomeric pigmented coating, both ready for immediate site use.

The film-forming, stabilising primer (Nitoprime DG) is supplied as a clear liquid and is based on an acrylic resin and a silane-siloxane dissolved in a penetrating organic carrier. The primer is reactive and capable of producing a chemically-bound hydrophobic barrier, thus inhibiting the passage of water and water-borne contaminants. A thin surface film is produced which consolidates and stabilises porous substrates. Dekguard Elastic is an elastomeric, water based protective coating based on a special acrylic polymer. It provides excellent elongation and recovery, low dirt pickup, resistance to aggressive elements, UV light and rain.

It is available in a wide range of colours.

Standards Compliance:

Dekguard Elastic has been approved by the British Board of Fire tested to BS 476, Pt 7: 1987. Spread of flame - Class 1. Fire tested to BS 476, Pt 6: 1989. Propagation index I — 0.0. Sub index i1 — 0.0. Building Regulations Rating — Class 0.

Specification clauses:

Elastomeric protective decorative surface coating. The protective coating system shall comprise Nitoprime DG, an acrylic film-forming penetrating silane-siloxane primer and Dekguard Elastic, a single component elastomeric coating suitable for application by brush, roller or spray. The total dry film thickness of the coating shall be not less than 400 microns and shall be capable of providing carbon dioxide diffusion resistance equivalent to not less than 125 mm of 30N/mm2 concrete cover (by the Taywood method) and a reduction in chloride ion penetration not less than 99% (by the Aston University Diffusion Cell method).

It must exhibit a water vapour transmission resistance (SD) of not more than 0.11 metres (by the Klopfer method) at a dry film thickness of 400 microns. The coating must be capable of withstanding 20,000 0mm – 1mm – 0mm cycles at 20°C without failure. In static testing, it must be capable of bridging a 6 mm incipient crack @ 20°C before failure and a 4 mm incipient crack @ 0°C before failure. When tested to BS 476, Pt 7 : 1987, it must exhibit a Class 1 spread of flame and achieve a Class 0 Building Regulations rating when tested to BS 476, Pt 6 : 1989 and Pt 7 : 1987.

Properties:

The values obtained are for the Dekguard Elastic system applied at the minimum recommended application rate.

Volume solids Dekguard Elastic: 49% Carbon dioxide diffusion resistance (BRE method).
Equivalent thickness of air —

 Initial:             > 100 metres
 After 2000 hours QUV:   > 100 metres

Equivalent thickness of 30 N/mm2 concrete cover

(Taywood method):      > 125 mm

Water vapour diffusion SD 0.11 m @ resistance (Klopfer method): 400 microns dft

Reduction in chloride ion penetration (Aston University
Diffusion Cell method): > 99%Agrément under Certificate No. 98/3461.

Incipient crack spanning capability @ 400 microns dft — static test (ASTM C836-84modified)

20°C: 6 mm
0°C:  4 mm
–15°C: 1.3 mm

Dynamic crack bridging capability 0 mm - 1 mm - 0 mm cycling

20°C 20,000 cycles (no failure)
0°C 15,000 cycles (no failure)
–5°C 4,000 cycles (no failure)

Tear resistance (ASTM D624-84): 12 N/mm2

Fire testing (BS 476, Pt 7: 1987) — Spread of flame: Class 1 Fire testing (BS 476, Pt 6: 1989) — Propagation index I: 0.0 Sub index i1: 0.0 Building Regulations rating: Class 0

Fosroc Dekguard Elastic / Anti-carbonation coatings /
Concrete Renovations the concrete repair specialists

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