Part 1 — General
1.1 Section Includes
A.Injection of a product to raise and support a failed section of concrete pavement back to grade for a suitable ride.
1.2 Related Sections
A.Section 02705: Concrete and Asphalt Cutting
1.3 References
A.ASTM C 1107: Packaged Dry, Hydraulic -Cement Grout (Nonshrink)
B.ASTM D 790: Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials
C.ASTM D 1621: Compressive Properties of Rigid Cellular Plastics
D.ASTM D 1622: Apparent Density of Rigid Cellular Plastics
1.4 DEFINITIONS Not Used
1.5 Submittals
A.Copies of invoices from mix suppliers for information.
B.Manufacturer’s product data sheet and recommended installation instructions.
C.A warranty letter guaranteeing all materials and workmanship for a period of one year.
1.The guarantee period starts on the date of Substantial Completion.
2.Include in the letter:
a.State Project Designation
b.State Project Name
c.Contractor and Installer Name
3.Defects (performance failures) include:
a.Re-settling of treated areas beyond ⅛ i nch of finished grade profile
4.The guarantee covers 100 percent of the concrete slab jacking costs.
5.Replace by re- injection or slab replacement any material that fails during the warranty period.
1.8 Payment Procedures
A.Liquid quantities of non- shrink grout measured using a calibrated meter paid for at the contract unit price per cubic yard .
B.Liquid quantities of High- Density Polyurethane measured using methods approved by Engineer paid for at the contract unit price per pound.
Part 2 — Products
2.1 High Density Polyurethane
A.Use water based formulation of expanding high- density polyurethane that sets to full compressive strength within 15 minutes after injection to raise slabs . Table 1 High -Density Polyurethane PROPERTY ASTM LIMITS Density D 1622 Min 3.8 lb/ft3 - Max 4.3 lb/ft3 Tensile Strength D 790* Min. 80 psi Elongation N/A Max. 5.1% Compressive Strength at Yield Point D 1621 Min. 60 psi *Use the value of flexural strength or flexural yield as tensile strength.
2.2 Non- Shrink Grout
A.Use packaged dry, hydraulic -cement grout (non- shrink) according to ASTM C 1107.
2.3 Equipment
A.Equipment capable of supplying a homogenous 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 application type.
D.Elevation measuring devices with an accuracy of ⅛ inch.
E.Concrete saw capable of cutting joints between failed and non- failed slabs.
Part 3 — Execution
3.1 Preparation
A.Establish a finish target profile of pavement using elevation measuring device or string lines.
B.Saw cut joints between failed and non- failed slabs as necessary to prevent damage to non- failed slabs . Refer to Section 02705 .
3.2 Installation
A.Drill holes as necessary in roadway slab.
B.Inject product to evenly raise slab to finished grade profile.
C.Fill injection holes with at least 4 inches of non- shrink grout.
D.Final grade after jacking must be within ± ⅛ inch of finished grade profile.
Source: Utah Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 572–574 of 1,331.