By U.S. Dept of Transportation
This booklet comprises pavement upkeep manuals meant to be used through road upkeep corporations and gotten smaller upkeep corporations within the box and within the place of work. every one is a compendium of excellent practices for portland cement concrete (PCC) joint resealing and partial-depth spall fix, respectively, stemming from Strategic street examine software (SHRP) reports.
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Extra resources for Concrete Pavement Repair Manuals of Practice
It also keeps the sealant from bonding to the bottom of the reservoir and, if properly selected and installed, it helps maintain the proper sealant thickness. The rod must be flexible, compressible, non-shrinking, non-reactive, and nonabsorptive. Shrinking rod may allow sealant to flow past the rod before the sealant sets. Backer rod that reacts with certain sealants may produce bubbles in or staining of the sealant. Finally, backer rod that absorbs water may shorten the life of the sealant material.
Production rates for initial and final airblasting can vary with the capacity and pressure provided by the air compressor. Large amounts of debris in the joint or on the pavement surface will slow the airblasting operation. The rate of sandblasting is a function of the equipment, nozzle, and abrasive type used. Where old sealant remains on the joint walls, the rate of sandblasting will decrease. 4-mm) inside diameter sandblast hose can use about 600 lb (272 kg) of abrasive per hour. 40 The rate of primer installation varies greatly with the application method.
Troubleshooting Problems Encountered Blade is pulling to one side. Blade is not cleaning both sides. Sealant is "gumming up" blade. One side of the ganged blades is worn. procedures for resawing Possible Solutions Change the rate of sawing. Check for rear wheel alignment. Use wider blades. Use smaller diameter blades. Use a more skilled operator. Remove (plow) sealant before sawing. Switch the inside and outside blades. The saw cut does not begin in Have the saw operator take more care. the center of the joint.