Low-SEVERITY Longitudinal Cracks
or Joints
If you have low-severity longitudinal cracks while aggregate interlock is still intact, you need to perform:
Cross-Stitching or Slot-Stitching
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Cross- and slot-stitching can be used to maintain aggregate interlock, providing added reinforcement and strength to longitudinal cracks and unreinforced longitudinal joints. Tie bars used in stitching inhibit the crack or joint from vertical and
horizontal movement or widening. Cross-stitching uses deformed tie bars (typically 0.75-inch in diameter) epoxied or grouted into holes drilled at an angle through a crack or longitudinal joint, whereas with slot-stitching the bars are grouted into slots cut across the crack/joint. Cross- and slot-stitching should be used on longitudinal cracks/joints that are in reasonably good condition. Transverse cracks/joints should not be treated using this repair method.
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If aggregate interlock is lost, refer to the cracked slab section.
Resources
CPR: Rebuilt to Last: Salt Lake City Concrete Pavement Restoration
In downtown Salt Lake City, Industrial Road at California Avenue required repair. The methods chosen were soil foundation stabilization, slabjacking, slab replacement, stitch-in-time crack repair, dowel bar retrofit (DBR), diamond grinding and joint resealing. The combination of using high density expansive polymers in conjunction with other concrete pavement preservation techniques including dowel bar retrofit and diamond grinding should extend the life of this pavement for approximately 15-20 years.
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Case Study
Industrial
Concrete Pavement Preservation and Restoration, Diamond Grinding, Dowel Bar Retrofit, Full & Partial Depth Repair, Joint and Crack Resealing, Slab Stabilization
Structural/Material Issues
CPR: Rebuilt to Last: A progressive concrete pavement preservation strategy improves city streets in Minneapolis
City streets in Minneapolis benefited from the implementation of concrete pavement preservation (CPP) techniques. The strategy focused on rehabilitating structurally sound residential streets using methods such as diamond grinding, dowel bar retrofit (DBR), full depth repair (FDR), partial depth repair (PDR), cross/slot stitching, joint resealing, and crack resealing. This approach was chosen for its sustainability and cost-effectiveness, enhancing road safety and extending pavement lifespan by up to 25 years.
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City/Municipal
Concrete Pavement Preservation and Restoration
Sustainability/Environmental
Concrete Pavement Preservation (CPP) Slashed Repair Costs
The city of Baytown, Texas lowered the expected repair costs by 80% with concrete pavement preservation (CPP). CCP techniques are less invasive, low-cost alternatives to full concrete replacements. The city replaced approximately 20 percent of the road surface with CCP work including full-depth panel replacement, dowel bar retrofit, cross stitching, replacement and resetting of manholes, diamond grinding, and crack repair and sealing.
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City/Municipal, Highway, Industrial
Concrete Pavement Preservation and Restoration
Structural/Material Issues
Concrete Pavement Preservation (CPP) Built To Last
In 2020, Oklahoma's concrete pavements were due to begin a maintenance cycle, and by the end of that year, concrete pavement preservation (CPP) consisting of selected panel replacements, dowel bar retrofit (DBR) and diamond grinding had been completed on portions of the Cimarron, Bailey and Indian Nation Turnpikes. CPP allows for seven times the length of roadway repaired for every dollar spent.
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Highway
Concrete Pavement Preservation and Restoration, Diamond Grinding, Dowel Bar Retrofit
Structural/Material Issues