Pressure Grouting ( Mudjacking ) Services

2026-11-03

1 . This project proposes to service approximately 3 , 000 – 4 , 000 sidewalk slabs , and an undetermined amount of street pavement slabs , of varying dimensions by mudjacking method using a slurry mixture . The proposed work is to correct alignment of offset slab joints and / or to elevate slabs so as to establish slope to eliminate areas of standing water . 2 . Each ton of grout to be pumped shall consist of approximately 1 , 680 pounds of powdered limestone ( containing a minimum of 90 % calcium and magnesium carbonates graded so that 100 % pass a 60 mesh screen , 85 % pass a 100 mesh screen , and 60 % pass a 200 mesh screen ) and no less than 320 pounds of Portland cement . 3 . Dry material is to be mixed with only potable water using mechanical mixing equipment capable of producing a uniformly mixed grout of the proper consistency . The grout should not exceed a 5 ” ( five - inch ) slump . Pump aids , mix additives or waterproofing agents may be added at this time if desired or needed . Grout mixture will provide 80 psi strength and no expansive or shrinkage qualities . 4 . The Contractor shall at all times ascertain where grout is flowing and is responsible for removing any excess grout in sod area , storm sewers , and sanitary sewers . 5 . Mudjacking core holes shall not exceed 2 ½ ” ( two and one - half inches ) in diameter . In general , drilled holes shall be spaced not less than 12 ” ( twelve inches ) or more than 18 ” ( eighteen inches ) from each transverse joint . Spacing of holes on each slab shall be field determined to achieve maximum lifting action . 6 . The Contractor shall take every precaution to prevent damage to any slab being lifted . If cracking occurs during the lifting of a slab , the operation shall be stopped , the cause of the cracking determined , and the method altered so as to minimize further cracking . Slabs cracked during the lifting process which are determined to be unserviceable shall be removed and replaced by the Contractor at the Contractor ’ s expense . The Contractor shall be responsible as part of his work for any sawcutting which may be necessary within each individual work area . 7 . Upon achieving the desired finish slab elevation , all drilled holes shall be filled and finished flush to the slab surface with a non - shrinking grout / water mixture . 8 . No pumping / lifting work shall be undertaken when the ground is frozen or when the air temperature is below 40 ˚ F .

Missouri

2026-04-29