The substrate must be sound, ﬁrm and clean, free of oil, grease, loose particles and cement laitance, old layers of paint, or other contaminants. All edges to be repaired must be square cut to a minimum of 10 mm deep, perpendicular to the surface, followed by the removal of all unsound material. When using compressed air for cleaning, the air must be clean and oil free. Never feather edge the product. Absorbent substrates must be thoroughly wetted, to reduce suction, which causes shrinkage, resulting in loss of bond. This must be carried out at least 12 hours prior to the application of dura.®rep FR. The substrate is required to be well dampened, with no free water on the surface. All metal to be coated must be clean, mechanically sound and dry. Expose all corroded reinforcing steel and grit blast. A clean bright ﬁnish is required ensuring that all corrosion products are removed, particularly behind the steel. The anchor pattern should be approximately 40 to 60 microns from peak to valley. Prime before ﬂash rusting occurs, see data sheet dura.®rep FR primer.
Use epidermix 344 wet to dry epoxy as a primer for structural application where the bond strength must be equal or greater than the parent material. All exposed reinforcing bars must be primed by applying dura.®rep ZR primer (see relevant data sheets).
Add approximately 2/3 of the required mixing water and while stirring, preferably mechanically, slowly add the powder and mix until lump free.
The plastic-thixotropic mortar can now be applied by trowel, spatula or ﬂoat. The mortar can be made up to a stiffer consistency by using less water.
Note: High speed mixing entraps an excessive amount of air and therefore should be avoided.
25 kg of dura.®rep FR powder with 4.2 litres of water yields approximately 13 litres.
dura.®rep FR is used for repair and restoration of large horizontal areas and vertical surfaces, such as worn concrete road surfaces and bridges, as well as for repairing concrete, renderings, natural and artiﬁcial stone, and erosion damage to sewer tunnel structures. On vertical surfaces, dura.®rep FR is suitable for surface repairs, remoulding large breakaway at the edges (on pillars and chords), Rubber gloves should be worn because of the material’s high cementitious content (alkaline). Application may be carried out in layers or applied up to 70 mm in one pass. When striking off thick sections care should be taken in terms of timing as the material below may not have set sufﬁciently and due to its thixotropic properties hogging may occur (slumping) resulting in surface cracking.
Like all cement based materials dura.®rep FR must be cured immediately, as soon as the surface will not be marred. This is carried out by applying, by brush or spray, a suitable curing compound like CHRYSO®Cure R or as recommended by a.b.e.® Construction Chemicals. In rapid drying conditions caused by high winds or direct sunlight additional precautions should be included like sealing with polythene sheeting having the edges taped down. This may include damp hessian behind the sheeting to prevent moisture loss. Similarly in cold conditions, the repaired area must be protected from freezing.
Clean tools with water before the mortar hardens. Hardened material can only be removed by mechanical means.
dura.®rep FR is supplied in 25 kg polyethylene lined paper bags.
Shelf life of 12 months, but shorter if in extreme conditions. Keep tightly sealed in a dry cool place in the original packaging.
Product safety information required for safe use is not included. Before handling, read product and safety data sheets and container labels for safe use, physical and health hazard information. The safety data sheet is available from your local a.b.e.® Construction Chemicals branch.