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
Concrete Repair Best Practices
Concrete pavement restoration (CPR) techniques have gained greater national significance as DOT agencies attempt to further extend infrastructure service lives prior to required major rehabilitation or reconstruction. This report consolidates best practice case studies for six CPR techniques: cross stitching, dowel bar retrofit, diamond grinding, full depth repair, partial depth repair and slab stabilization.
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Technical Info
City/Municipal, Highway
Concrete Pavement Preservation and Restoration, Diamond Grinding, Dowel Bar Retrofit, Full & Partial Depth Repair, Joint and Crack Resealing
Structural/Material Issues
FHWA Checklist - Cross Stitching for Portland Cement Concrete Pavements
Pavement Preservation Checklist Series
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Technical Info
Airport/Airfield, Bridge, City/Municipal, Highway, Industrial, Race Track
Cross/Slot Stitching
Structural/Material Issues
Progressive Concrete Pavement Preservation Strategy Improves City Streets in Minneapolis
A Progressive Concrete Pavement Preservation Strategy Improves City Streets in Minneapolis
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Case Study
City/Municipal
Cross/Slot Stitching, Diamond Grinding, Dowel Bar Retrofit, Full & Partial Depth Repair, Joint and Crack Resealing, Slab Stabilization
Friction/Safety, Sustainability/Environmental
CPP for City Streets: Smooth Pavements Last Longer!
Concrete pavements can achieve maximum longevity using strategic repair techniques. Today's urban streets have, in many cases, encountered 40 to 60 years of wear and tear. Concrete Pavement Preservation (CPP) is a series of engineered techniques to rehabilitate concrete pavement. It is a viable alternative to costly asphalt overlays. Basic CPP techniques include: slab stabilization, full depth repair, partial depth repair, dowel bar retrofit, cross-stitching longitudinal cracks or joints, diamond grinding, joint resealing and crack resealing.
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Fact Sheet
City/Municipal
Concrete Pavement Preservation and Restoration
Smoothness, Structural/Material Issues, Sustainability/Environmental