A Guide To Polished Concrete Part Three
Jul 06, 2016

Make sure the edges of the rooms are also well floated so that they blend in with the floor during the grinding and polishing process.

FINISHING THE CONCRETE FLOOR:

Expansion joints are necessary in the floor to avoid cracking. It is usually sufficient to place these at doorways where they will be covered by the door saddle and wont be seen. In larger areas expansion joints should be set out to divide the floor into large squares, up to a maximum of 9m². They can be cut into the cured concrete floor and are approx. 6mm wide.

POLISHING AND GRINDING:

There are various levels of grinding and polishing available, but as a general rule the deeper you grind into the concrete the more aggregate you expose and therefore the glossier the finish.

The high gloss finish involves making several passes with the grinder to take a 3-5mm layer of concrete off the top. Once sealed and polished the result is an extremely durable floor. Truck wheels and substances leave no marks on the glossy surface and light reflects gently off the floor.

Alternatively you can choose not to expose the concrete aggregate. Instead, the top layer of the surface paste is polished but not removed. This process creates a stronger surface paste with a shiny finish.

Another option is to go for a hard troweled floor with a power float. The appearance of this is like raw concrete and so is not to everybodys taste. A gloss finish is achieved using a solvent based sealer. This finish is completely dependant on the way the concrete is power-floated and it will have to be very well protected after pouring as scratches and fillers will be hard to disguise.

PROTECTION AND MAINTENANCE:

In general the concrete floor does not need to be covered until after it has been grinded.

The top layer acts as protection from scratches, bangs, spills etc.

Once the floor has been grinded it will need to be covered until the end of the project.

Maintaining the floor is relatively straightforward. The floor can be cleaned using soapy water and a micro fibre mop. To buff the floor an industrial type pad cleaner with specific cleaning pads can be used. A spray-on sealer is first applied and worked into the floor using the micro fibre mop before making a pass with the pad cleaner. This buffs the floor and removes any marks or scratches.


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