528.1DESCRIPTION—This work consists of cross-stitching longitudinal cracks and may include cross -
stitching longitudinal joints in plain cement concrete pavement by placing epoxy coated deformed tie bars, at an angle, across the longitudinal joint or crack.
528.2MATERIAL—
supplier listed in Bulletin 15. Follow the manufacturer’s recommended procedures. Provide the Representative with the material data sheets before the start of work.
528.3CONSTRUCTION—
14 days before the start of work. Detail all of the construction procedures, equipment, and materials to be used. Demonstrate the cross-stitching operation to the Representative to receive final approval of operation procedures and an assessment of the capability of the equipment to be used. Perform the demonstration on a longitudinal crack or a longitudinal joint located within the project limits. Do not perform work if either the ambient air temperature or the pavement surface temperature is below 40F. Do not move drifted slabs back into position against the adjacent slabs. Do not use cross-stitching on transverse joints or cracks. Before cross-stitching longitudinal pavement joints make a full depth saw cut, in the existing longitudinal joint, along the entire length of the slab.
a drill rig to assure that the proper drill angle is maintained. The use of a gang mounted drill is allowed.
longitudinal joint or longitudinal crack at the required angle, offset distance, and spacing as shown on the Standard Drawing RC-26M. If spalling of the concrete pavement surface occurs, drill shallow vertical holes at each tie bar location. Drill angled holes to intersect the crack at approximately mid-depth of the pavement thickness. Do not allow the drilled hole to extend through the bottom of the slab. Thoroughly clean the drilled holes of all dust and debris . If using compressed air , use a stream measuring at least 100 pounds per square inch at the source, free of oil, moisture, and other contaminants. When cross-stitching existing longitudinal joints, drill holes to the alignment shown on RC-26M. Change location of drill holes ± 1 inch to avoid existing longitudinal tie bars.
into the hole using a caulking gun or other approved method, leaving adequate space for the tie bar. Rotate the tie bar three to five complete rotations while inserting the tie bar to purge air voids as completely as possible. Provide 1 inch coverage for the tie bar at the surface of the pavement. Trowel the epoxy bonding compound flush with the pavement surface.
Immediately after routing, flush the entire longitudinal crack or longitudinal joint with water. Immediately before placing the sealant, clean the longitudinal crack or longitudinal joint . Do not place joint sealing material until the faces are thoroughly clean and dry to the satisfaction of the Representative.
Do not place sealing material if either the ambient air temperature or the pavement surface temperature is below 40F . Fill the longitudinal crack or longitudinal joint to a level of 1/8 inch to 1/4 inch below the pavement surface. Do not let sealing material spread over the pavement surface.
with the manufacturer’s recommendations.
the bottom of the slab with a full depth pavement patch at no additional cost to the Department.
528.4MEASUREMENT AND PAYMENT—Each
Measurement of cross-stitching will be made per tie bar, at each individual location. Drilling holes, epoxy bonding compound, tie bar installation, crack sealing and all other items of work will be incidental to the payment for cross stitching.
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