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
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.
If aggregate interlock is lost, refer to the cracked slab section.
Resources
Calcium Sulfoaluminate (CSA) Cement
Calcium Sulfoaluminate (CSA) cement is an advanced cementitious material known for its fast setting, high early strength, low shrinkage, long-term durability and low carbon footprint. CSA is increasingly recognized as a vital component in modern construction due to its significant benefits that align with the industry’s evolving goals of sustainability, efficiency and innovation. CSA cement aligns with the construction industry’s goals by offering a sustainable alternative that meets the demands for efficiency and high performance. Its unique properties enable innovative applications in areas such as rapid repair, pushing the boundaries of traditional construction methods.
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Fact Sheet
Airport/Airfield, Bridge, City/Municipal, Highway, Industrial, Race Track
Concrete Pavement Preservation and Restoration, Dowel Bar Retrofit, Full & Partial Depth Repair
Structural/Material Issues, Sustainability/Environmental
Minnesota State Aid Concrete Pavement Rehabilitation Best Practices Manual
This manual has been developed, with permission, from information published by the Minnesota Department of Transportation (MnDOT) and the American Concrete Pavement Association’s Concrete Pavement Repair Manual, which was printed in May 2003. It includes joint repair, partial-depth repair (PDR), full-depth repair (FDR) and dowel bar retrofit (DBR).
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Technical Info
Bridge, City/Municipal, Highway
Concrete Pavement Preservation and Restoration
Structural/Material Issues
Cross Stitching
This summary of a cross-stitch case study by the Missouri Department of Transportation (MoDOT) details cross/slot stitching to repair longitudinal cracks and restore load transfer efficiency. Techniques highlighted in the study include diamond grinding to enhance smoothness and ride quality, along with joint resealing to prevent water ingress. The combined techniques resulted in a cost-effective and sustainable repair solution, extending the pavement's service life and ensuring a smoother, safer driving experience for motorists.
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Technical Info
Airport/Airfield, Bridge, City/Municipal, Highway, Industrial, Race Track
Cross/Slot Stitching
Structural/Material Issues
FHWA Pavement Preservation Checklist Series: Cross Stitching for Portland Cement Concrete Pavements
This checklist for cross stitching for portland cement concrete is one in a series created to guide state and local highway preservation/maintenance and inspection staff on the use of innovative pavement preservation techniques. FHWA uses its partnerships with different pavement preservation organizations including American Association of State Highway and Transportation Officials, and state and local transportation agencies to promote pavement preservation.
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Technical Info
Airport/Airfield, Bridge, City/Municipal, Highway, Industrial, Race Track
Cross/Slot Stitching
Structural/Material Issues
Buried Treasure Results in Road Improvement Savings: Uncover Value with CPP
With steady increase in asphalt prices over the years, the mill and overlay option is becoming far too expensive. Diamond grinding of pavement surfaces often meet and exceed the smoothness, friction and noise characteristics of the best asphalt surface treatments and can be half the cost of an asphalt overlay. The Buried Treasure concept using concrete pavement preservation (CPP) is a sound integration of engineering, economics and the environment.
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Fact Sheet
Highway, City/Municipal
Concrete Pavement Preservation and Restoration, Diamond Grinding, Joint and Crack Resealing, Full & Partial Depth Repair
Tire/Pavement Noise, Sustainability/Environmental
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