If you have slab warping or unevenness, you need to perform:

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Conventional Diamond Grinding (CDG)

 

Conventional diamond grinding (CDG) is often used to create the smoothest and safest pavements available today. It is
appropriate for both new construction and existing pavement and can be performed at any time during a pavement’s life.

Diamond grinding removes a thin layer of the hardened concrete surface using a self-propelled machine outfitted with a series of closely spaced diamond saw blades mounted on a rotating shaft. Unlike diamond-impregnated carbide bits, which use impact to chip away the concrete surface, CDG blades use abrasion to gently remove the surface layer without the risk of introducing microcracking of the aggregates. After diamond grinding, the pavement texture consists of grooves and lands, with the grooves lying beneath the pavement interface.

 

CDG has been in use since the 1960s, with nearly 20 million square yards of pavement diamond ground each year in the United States alone. In addition to using CDG to improve the performance of existing, in-service pavements, several state Departments of Transportation specify diamond ground surfaces as the final surface on newly placed portland cement concrete pavement (PCCP).