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PREPARED TO WIN


The Preparation Group has refurbished a concrete floor as part of an award-winning project.


The Preparation Group’s Contracting Division, PPC, prepared and polished the concrete floor at the University Technical College in Lincoln. This formed part of a job for the main contractor that won Development Project of the Year in the over £5m category at the inaugural Lincoln Construction and Property Awards.


PPC was contracted to polish the 40m uneven and pitted concrete slab, in the reception and foyer area. Unusually, the specification was to show the nature of the concrete rather than reducing it down to reveal an even aggregate.


The first stage was to remove the high spots, some of which were 18mm, by using the single head 250 Grinder,


38 | SUBFLOOR PREPARATION


followed by grinding the area flat and smooth with the multi-head Terrco 701- S Grinding and Polishing machine and a hand grinder to complete the edges.


The polishing process was completed with the STG450 multi-tasking machine, fitted firstly with Surface Finishing Diamond Pads (SFD’s), working up the grades from 100 to the finest 800 and then Storm Diamond Pads to create the final sheen, polishing the floor with just water.


BEFORE EMBARKING ON CONCRETE


POLISHING The cement, sand and stone in concrete can be ground and


polished to a terrazzo type finish, its composition will naturally dictate the finished result. For a consistent finish, it is important that the concrete is laid in a uniform manner. Polished concrete is produced by removing the top surface laitance and grinding down to the centre of the first layer of aggregate, then polishing to the degree of shine required.


There are a couple of factors to consider; is the surface cracked or are defects evident? And what is the type of aggregate, its size, colour mix and percentage? It is possible to view the final effect that will be achieved, by hand-grinding a sample area first and adding a small amount of water.


www.tomorrowscontractfloors.com


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