GRINDING
Grinding would be selected when a flat, level and smooth concrete profile is required. It is used for removing surface contaminants, adhesives, paint, sealers and coatings and for cleaning.
Grinding models are available in single phase or three-phase electric and in single-head, double-head, and multi- head versions. There are also diesel and petrol powered alternatives and variable speed models which can be fitted with provision for wet grinding and polishing applications.
The grinding principle is achieved by diamond, tungsten or resin-bonded plates or discs which are secured to the single or multiple rotating heads. There is a wide range of grades of diamond, resin bonded and PCD (Polycrystalline Diamond) shoes, for removal of adhesives and coatings and for grinding, smoothing and polishing decorative screeds and concrete screed.
As a general rule, hard composition surfaces will require a soft bond diamond segment or disc and soft compositions a hard bond. The correct diamond accessory is important, as incorrect selection will either simply glaze over the surface without creating the profile or will ‘wear out’ extremely quickly in the initial stages of the operation.
Grinding is not recommended if the surface is uneven or on “tamped” concrete.
MULTI-STRIPPING
Often, multi-stripping is selected when there are no other effective options available, e.g. removing sheet floor coverings and tiles.
There are 110v hand-operated, walk-behind machines for clearing small areas and large ride-on three- phase electrical or propane powered machines for clearing large areas.
Blades or picks are attached to the front of the machine and their type, weight and position affects the removal of the designated surface. A flat blade would be selected to scrape off tiles, latex, adhesives and elastomeric systems, whilst a curved blade cuts material into manageable lengths as it strips, so is ideal to lift
up carpet and sheet vinyl. Picks are employed to break up hard materials such as ceramics and terrazzo tiles.
The operator positions the machine to cut or lift the material as the machine drives forward. In this way multi- strippers can remove floor coverings such as; wood, vinyl, carpets, ceramic tiles, latex, screeds, waterproofing membranes, asphalt, bituminous materials, adhesives, epoxies, polyurethanes, sticky residues and thermoplastic materials.
Multi-stripping often needs to be followed by another method, in order to achieve a suitable profile for the application of the final flooring system.
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