Maintenance and Rehabilitation

Slab Stabilization

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Slab stabilization seeks to fill voids beneath the slab caused by pumping, consolidation or other means. If left untreated, these voids, which are often quite small (on the order of 3 mm (0.125 inches) deep), may cause other problems such as faulting, corner breaks or cracking (ACPA, 1995[1]). Voids are typically filled by pumping grout through holes drilled through the slab.


Preventive and corrective maintenance. Restores proper base/subgrade slab support to prevent more serious distresses such as faulting, corner breaks and cracking.


Pozzolan-cement grout.

Other Information

Slab stabilization only fills the voids under a slab, it should not be confused with slab jacking, which is used to raise the elevation of a depressed slab.

Footnotes    (↵ returns to text)
  1. American Concrete Pavement Association (ACPA).  (1995).  Construction of Portland Cement Concrete Pavements.  National Highway Institute Course No. 13133.  AASHTO/FHWA/Industry joint training.  Federal Highway Administration, Department of Transportation.  Washington, D.C.




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