APPROACH SLAB JACKING
PART 1 GENERAL
1.1SECTION INCLUDES
A.Slab jacking by pumping non-shrink grout or injecting high density
polyurethane.
1.2RELATED SECTIONS
A.Section 02755: Concrete Slab Jacking
B.Section 03924: Structural Concrete Repair
1.3REFERENCES
A.ASTM C 1107: Packaged Dry, Hydraulic-Cement Grout (Nonshrink)
1.4DEFINITIONS Not Used
1.5SUBMITTALS
A.Manufacturer’s product data sheets and recommended installation
instructions.
B.Certificate of compliance for the materials used.
PART 2 PRODUCTS
2.1EQUIPMENT
A.Equipment capable of supplying a homogeneous product at the
appropriate rate.
B.Certified scales or measuring devices to measure delivered product and to
proportion product components.
C.Concrete drill or saw capable of producing circular holes of adequate size
for the appropriate application type.
Approach Slab Jacking
D.Elevation measuring devices with an accuracy of ⅛ inch.
E.Concrete saw capable of cutting a joint in roadway slab just adjacent to
end of approach slab.
2.2NON-SHRINK GROUT
A.Refer to ASTM C 1107.
2.3HIGH DENSITY POLYURETHANE
A.Refer to Section 02755.
PART 3 EXECUTION
3.1PREPARATION
A.Establish a final target approach slab profile using an elevation measuring
device or string lines.
B.Clean all adjacent joints before jacking to allow free movement of the slab.
C.Locate structural steel by ferroscanning or other method approved by the
Engineer.
1.Do not damage existing rebar during preparation or installation.
D.Drill a minimum of four evenly spaced holes into each half of the approach
slab where required to obtain uniform grout or polyurethane placement.
1.Drill vertical holes that are round.
2.Drill holes with a maximum diameter of 3 inches.
E.Do not crack approach slab.
1.Follow Section 03924 to repair approach slab cracks if they
develop.
F.Protect integrity of approach slab drains.
1.Drains in precast approach slabs may require additional
preparation and procedures.
2.These must be approved by the Engineer before execution.
Approach Slab Jacking
3.2INSTALLATION
A.Pump, in a pattern, the amount of material required to completely fill the
voids underneath the slab.
1.Raise the approach slab to within plus or minus ⅛ inch from the
final targeted approach slab profile.
B.Remove polyurethane material from the drill holes to the full depth of the
approach slab at the completion of the pumping operation and clean the full depth of the holes along the circumference with a wire brush.
1.Dampen the walls of the holes prior to grout placement.
C.Fill the holes with non-shrink grout. Overfill the holes by ¼ inch.
D.Grind the non-shrink grout used to fill the holes flush with the top of the
approach slab.
END OF SECTION
Approach Slab Jacking
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Source: Utah Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 1086–1088 of 1,331. View official source ↗