Technical Reference

Treatment Procedures.

Step-by-step waterproofing, structural repair and rehabilitation methods, grouped by the chemistry they use, each mapped to the Armstrong products that carry it out. Select a treatment to view the full procedure and product recommendations.

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Treatment · Polymer mortars & concrete repair

Polymer Cement Mortar Plastering

Ceiling and wall rehabilitation with corrosion protection

Applications

Deteriorated ceilingsRoof slab soffitsWater-retaining structuresToiletsExternal RCC walls

Procedure

Sound the surface with a wooden mallet to find hollow areas, and chip all deteriorated and loose concrete back to a sound base with a chisel and hammer.
Clean the exposed bars with a wire brush or emery paper, and brush ALSTRONG RC onto any tight rust left in pits.
Add steel wherever needed, tied with epoxy or welded.
Coat the bars with two coats of ALSTRONG AC and let it dry.
Dampen the concrete, keeping the water off the coated bars, until the pores are full with no water standing.
Apply one coat of ROOFBOND SBR 401 mixed with cement as a bond coat, about 300 g per sq.m.
While the bond coat is wet, lay 1:4 polymer cement mortar with ROOFCRETE AR 576 at 2 litres per 50 kg of cement: 20 mm first coat and 10 mm finishing coat. Or apply ROOFCRETE AR to an average of about 30 mm.
Spray ROOFEXCURE WB as soon as the mortar is finished.

Important Suggestions

Remove all deteriorated material and rust from the bars. Provide extra steel wherever the engineer asks for it.

Why This Treatment?

Polymer cement mortar bonds strongly to old concrete, seals capillaries and resists cracking, while the anti-corrosive coat stops the bars rusting again under the repair.