Concrete grinding is mechanised process using heavy-duty grinding machine equipped with progressively finer grits of diamond-impregnated segments or disks to gradually hone down surfaces to the desired degree. Instead of applying a weaker and insignificant product to the concrete, this process refines and enhance the qualities that is naturally inherent within the concrete.
The process begins with the use of coarse diamond segments bonded in a metallic matrix. These segments are coarse enough to remove pits, blemishes, stains, or light coatings from the floor in preparation for final smoothing. Depending on the condition of the concrete, this initial rough grinding is generally a three to four step process.
Concrete grinding is cost effective as it saves businesses time and money.
Concrete grinding is a 4-stage process. During the grinding stages, approximately 4mm floor thickness is reduced, dependent on the initial concrete quality and condition.
GRINDED CONCRETE OPTIONS
Concrete grinding to STAGE 1, leaves a floor almost level, grinded with a 25 grit material showing significant tool marks on an uneven floor finish, ready to accept self-levelling compound.
STAGE 2 grinded concrete, provides a level surface finished with a 25 grit grinding media, absorbing more of the pitting and imperfections of the initial floor, still reflecting significant tooling marks in the final surface. This surface finish is deemed acceptable for epoxy type floor coverings to follow.
STAGE 3 concrete grinding, is done with a 40 grit grinding media, leaving a level surface containing less tool marks, however not finished enough to be deemed an acceptable floor finish without a follow up floor covering.
STAGE 4 concrete grinding is done with a 80 grit grinding media, leaving a level and porous surface, containing some tool marks which can be sealed and potentially hidden by means of a chemical sealant to provide an finished floor surface. Alternatively, the option to proceed with polishing can follow which included 3 more stages for a matt or gloss finished surface which does not require a chemical seal providing a significantly increased hardwearing surface with less maintenance.
CAN ALL CONCRETE BE GRINDED?
Almost any structurally sound concrete floor, whether new or old, can be grinded, with some exceptions.
For new floors, no special mix design is required to achieve good results. The floor should be placed at least 7 days prior the main grind and 28 days before high polishing begins to ensure adequate curing. Some retail and warehouse facilities that plan to polish their floors after placement may specify the installation of as smooth a floor as possible to minimize the polishing steps required.
Existing floors typically require some surface preparation prior to polishing to remove dirt, grease, coatings, or blemishes. Uneven floor may need extensive patching, sealing or rework and some extremely porous floors may not be good candidates for polishing. Floor suitability should be determined by the contractor. quality and condition.
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