Concrete Pavement Maintenance
Cross Stitching is a repair technique for longitudinal cracks in rigid pavements which are in reasonably good condition. The purpose of cross-stitching is to maintain aggregate interlock and provide added reinforcement and strength. The tie bars used in cross-stitching prevent the crack from vertical and horizontal movement or widening.
Cross Stitching uses deformed tie bars drilled across a crack at angles of 35 degrees. A number 6 bar is sufficient to hold the joint tightly closed and enhance aggregate interlock. The bars, spaced 20-30 inches from center to center, alternate from each side of the crack. Heavy truck traffic and airplane traffic require the 20 inch bar spacing while the 30 inch spacing is adequate for light traffic and interior highway lanes.
Be careful not to stitch a transverse crack which has assumed the role of an adjacent joint. Stitching will not allow transverse joint movement (open and closure). A new crack will likely develop near a stitched working crack or the concrete will spall over the reinforcing bars.
Estimated Service Life: 5 -10 Years
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