Construction Chemicals

Surface preparation

The surface should be clean and sound, free of dust, loose particles, grease, oil, primers from previous membrane systems and bitumen. Bitumen or primers should be removed by shot blasting or mechanical means. Spalled concrete should be repaired by cutting back to sound concrete and patching with Quickset CEMTEC Plaster.

Critical areas

Use CEMTEC tape at all critical areas such as intersections, corner joints, floor/wall junctions, gaps and around pipelines before applying Cemlatex 2K. Before fixing the tape, fill and level the gaps and corners with polymer modified Quickset CEMTEC Plaster.

Mixing

Cemlatex 2K is supplied in pre-measured units. Slowly add the powder to the liquid in the ratio 2:1 and mix with a slow speed drill fitted with a paddle to a lump-free, smooth consistency. Do not rework a stiffened mix by adding more water, and only mix as much as can be used within 30–40 minutes.

Application

Saturate the concrete surface with clean water. Apply the first coat while the surface is still damp with no free standing water, using a short stiff bristle brush or roller at a minimum thickness of 1 mm per coat. After 2–6 hours, apply the second coat perpendicular to the first; it can be finished by rubbing down with a smooth sponge. Spray or trowel application is acceptable if the mixing ratio is adjusted for the right consistency. Over hollow blocks or highly porous areas, apply at least 3 coats to a total thickness of 3 mm.

Added to cement based mixes, FiTBond SBR improves bond and strength – typically a 10–15% increase in compressive strength and a 5–10% increase in flexural strength over a control mix.

Surface preparation

Moulds must be dry, clean and free of rust and foreign matter before applying Formguard AB. Any surface repairs done with putty should be fully cured and dry, and moulds should be protected from dust storms or rain during application.

Application

Formguard AB is ready to use and should be applied with a conventional mould oil sprayer, brush or sponge, in one continuous film as thinly and evenly as possible to avoid oil reflecting on the concrete surface. Wipe up any material that pools with a sponge.

Advantages

• Ready to use
• Spray or roller application
• Built-in rust inhibitors
• High quality concrete surfaces ready to paint, coat or seal
• No staining on the concrete surface
• Resistant to rain
• Non slip
• Progressively better results on wooden formwork
• Economical
• Minimises surface defects

Stir well before use and apply as thinly and evenly as possible by spray, roller or sponge. Remove any excess material with a sponge before pouring concrete.