Part 1 — General
1.1 Section Includes
A.Repair of concrete slope protection and cutoff wall
1.2 Related Sections
A.Section 02056: Embankment, Borrow, and Backfill
B.Section 03055: Portland Cement Concrete
C.Section 03152: Concrete Joint Control
D.Section 03211: Reinforcing Steel and Welded Wire
E.Section 03310: Structural Concrete
F.Section 03390: Concrete Curing
1.3 References
A.ASTM C 578: Rigid, Cellular Polystyrene Thermal Insulation
B.ASTM D 4285: Indicating Oil or Water in Compressed Air
C.ASTM D 5249: Backer Material for Use with Cold- and Hot-Applied Joint Sealants in Portland-Cement Concrete and Asphalt Joints
1.4 DEFINITIONS Not Used
1.5 Submittals
A.Manufacturer’s product data sheets and recommended installation instructions for review.
Part 2 — Products
2.1 Materials
A.Concrete – Class A(AE). Refer to Section 03055.
B.Reinforcing Steel
1.Coated reinforcing steel or coated welded wire according to Section 03211.
C.Backer Rod
1.Size the diameter of the backer rod to be 25% to 50% larger than opening at time of installation. For example:
a.0.5 inch backer rod for 3/8 inch opening
b.0.625 inch backer rod for ½ inch opening
c.1 inch backer rod for ¾ inch opening
d.1.25 inch backer rod for 1 inch opening
2.Use a closed cell, polyethylene-foam rod joint filler.
a.Meet the requirements of ASTM D 5249 Type 1 or Type 3.
D.Rigid Plastic Foam
1.Refer to ASTM C 578.
2.Type 9, Density of 2 lb/ft3.
E.Joint Sealer (Structures)
1.Refer to Section 03152.
F.Embankment Material
1.Refer to Section 02056.
2.2 Equipment
A.Sandblaster/Air Compressor
1.Verify air is free of water and oil according to ASTM D 4285.
B.Jackhammer
1.30 lb class or smaller
Part 3 — Execution
3.1 Concrete Removal
A.Make 1/2 inch deep saw cuts to define the work area unless shown otherwise.
B.Remove the concrete in work areas.
1.Use 30 lb class jackhammer or smaller.
2.Protect reinforcing steel to remain.
C.Sandblast clean exposed reinforcing steel and concrete surfaces before placing new concrete.
3.2 Embankment Preparation
A.Prepare the area to be repaired.
1.Smooth and shape the berms and slopes.
2.Fill depressions with embankment material, grade, and compact.
3.Firmly compact the embankment material.
3.3 Place Rigid Plastic Foam
A.Place rigid plastic foam material 1 inch thick against the surface of all structural members before placing the concrete slope protection.
B.Anchor the rigid plastic foam in place with a compatible adhesive.
C.Recess the rigid plastic foam in the joints against structural members so a groove is formed above the rigid plastic foam filler as shown.
3.4 Place Reinforcing Steel
A.Place reinforcing steel or welded wire when shown according to Section 03211.
B.Install doweled anchors when shown according to Section 03211.
3.5 Place Concrete
A.Thoroughly wet the surface with water before placing the concrete.
1.Remove standing water before placing concrete.
B.Keep the repair area clean until concrete has been placed.
C.Place concrete a maximum of 7 days after removing the existing concrete slope protection unless otherwise determined by the Engineer. Refer to Section 03310.
D.Make concrete of a consistency so it can be placed on the slopes without deformation.
E.Re-establish the original joint and scoring design unless shown otherwise.
F.Place entire slope protection during one placement.
1.Use a construction joint located in a scoring or at the junction of the slope and the abutment if it is not feasible to complete in a single placement.
3.6 Finish and Cure Concrete
A.Use a Floated Surface Finish.
1.Refer to Section 03310.
B.Cure Concrete.
1.Refer to Section 03390.
3.7 Seal Joints and Closures
A.Completely remove curing compounds, oil, grease, dirt, and any other foreign materials from concrete surfaces in the joints by sandblasting.
1.Provide concrete surfaces in the joints that are clean and dry when backer and sealant are placed.
B.Place the backer rod and Joint Sealer (Structures) when the concrete has properly cured.
C.Place the joint sealer (structures) with caulking guns in joints after placing the backer rod and in the recess above the rigid plastic foam as shown.
1.Apply the sealant when the substrate is at least 50 degrees F and ambient air temperature is not forecast to fall below 50 degrees F for at least 8 hours after application of sealant.
2.Seal joints and grooves in one continuous direction.
3.Tool the sealant using a concave pointing tool with soap solution until the joints and recess are sealed over completely.
4.Finish sealant in a neat and clean fashion.
a.Verify there are no irregular surfaces including peaks and valleys.
b.Remove sealant outside of the joint.
3.8 Protection
A.Prevent sandblasting material and debris from falling into waterways, pedestrian areas, traffic areas, or onto railroad tracks.
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Source: Utah Standard Specifications for Road and Bridge Construction, 2027 Edition. Pages 1107–1110 of 1,343. View official source ↗