Topcoat Systems Concrete Polishing GuideCall
Not every concrete floor can be polished easily, Polishing is not simply the process of hiding any imperfections and most of the important part of polishing involves how the floor is poured.
This 12 step guide will help to ensure that your final floor looks great
1 – The water in the concrete mix should be kept to the minimum recommended – this will reduce unsightly cracks once the floor is polished
2 – Reinforcing steel expansion joints should be placed at regular intervals (30 times the slab thickness maximum) Plastic fibres can also be added to minimise cracking.
3 – Ensure that the base is well compacted, making sure that all Service trenches are well compacted.
4 – The concrete should be mixed for at least 10 minutes in the truck. This will ensure that as level a finish as possible and will avoid separation.
5 – vibrating the concrete is very important to eliminate as many air bubbles as possible but try not to drag the vibrator through the concrete this will cause the stone to be driven down and will reduce the quality of the polished finish.
6 – Screeds, tools and footprints will all show up n the polishing concrete fill any holes left by tools or boots with Aggregate and not fines but walk on the floor as little as is possible until it is fully cured. Leave at least 3 days after pouring for indoor work and 7 days after pouring for exterior slabs. 14 days is optimal. Plastic fibres will help to keep aggregate in the concretes upper surface.
7 – If the surface is to be seeded it should be done before floating, the stones etc should be coated and pushed approximately 1 mm below the surface.
8– Bull float the Concrete
9 – Remove the bull float lines with a trial and pass over once or twice with a power floater. Do not over power float the floor as this will make the surface harder to grind.
10 – Make sure the concrete is as even as possible High points will be ground more and low points less giving the floor an uneven finish. Any low spots should be filled with aggregates not just fines.
11– Aggregates – using low shrinkage aggregates like Quartz, Limestone, dolomite, Granite and some basalts for a better finish.
12 – Never use curing compounds as this prevents sealer from getting into the floor in the polishing process. Only use water as a curing agent.