15 March 2001
Where there is an additional shoulder void and extra holes are required, the sequence becomes
more complicated. Usually, the shoulder joint is pumped last. If, however, the transverse joint is
wider than the shoulder joint, it may be necessary to pump the shoulder hole first.
7.8. Retesting Slab Corners. After a minimum of 24 hours has elapsed following completion of
subsealing, testing of the grouted slabs for stability should be accomplished at the same points as
previously tested. This testing should also include other joints that were not grouted for use as
control. If loss of support still exists after grouting, the slab should be regrouted. In each
regrouting, new holes will be needed. It is recommended that if, after three attempts to stabilize
the slab, voids are still present, no further regrouting should be attempted. Other methods of
repair should then be considered, such as full-depth repair.
7.9. Plugging and Cleanup. After grouting has been completed at any one hole, the packer is
removed and the hole is plugged with tapered wooden plugs to permit the grout to set, thus
preventing back pressure from forcing the grout back through the hole. The plugs are removed
and the hole is filled with a cement grout and finished to match the existing pavement. Surfaces
of the pavement adjacent to the holes should be kept clean of excess grout and other materials.
Grout and cement slurry on the pavement should be broomed and washed to avoid unsightly
discoloration and to remove the grout and slurry before it bonds to the pavement.