CURRENT PRACTICES AND RESEARCH ON CONTROLLING REFLECTION CRACKING

REFLECTION CRACKING HAS BECOME AN INCREASINGLY IMPORTANT PROBLEM AS THE MILEAGE OF BITUMINOUS RESURFACINGS OVER CONCRETE PAVEMENTS HAS GROWN. AS YET NO WHOLLY SATISFACTORY TECHNIQUE OF CRACK CONTROL HAS BEEN DEVELOPED. THE METHODS PROPOSED FOR CONTROLLING REFLECTION CRACKING ARE REVIEWED AND DISCUSSED. IN GENERAL THEY FALL INTO TWO BROAD CATEGORIES: PREVENTION AND SEALING. PREVENTION INVOLVES ELIMINATING THE FORCES WHICH CAUSE CRACKING OR MODIFYING THE RESURFACING IN THE VICINITY OF JOINTS TO ENABLE IT TO WITHSTAND THESE FORCES. NONE OF THE PROPOSED METHODS OF ELIMINATION ARE IN GENERAL USE, BUT MANY HAVE BEEN INCORPORATED IN TEST ROADS BOTH IN THIS COUNTRY AND ABROAD. SOME HAVE PROVED TO BE UNWORKABLE, OTHERS ARE BEING TESTED BUT ARE STILL TOO NEW TO PROVIDE DEFINITE CONCLUSIONS. SEVERAL PROPOSED TECHNIQUES HAVE YET TO BE TRIED OR NEED FURTHER DEVELOPMENT BEFORE THEIR WORTH CAN BE DETERMINED. THE SEALING OF REFLECTION CRACKS IS DIFFICULT BECAUSE OF THEIR NARROW WIDTH AND IRREGULAR SHAPE. THEY REQUIRE TECHNIQUES AND MATERIALS DIFFERING FROM THOSE DEVELOPED FOR SEALING JOINTS IN CEMENT CONCRETE PAVEMENTS. SURVEYS OF TECHNICAL LITERATURE, CORRESPONDENCE, AND QUESTIONNAIRES TO HIGHWAY AGENCIES REVEAL THAT CURRENT PRACTICES ARE FAR FROM SATISFACTORY. MOST TREATMENTS ARE NOT EFFECTIVE IN KEEPING OUT WATER AND DIRT AND PREVENTING FURTHER DETERIORATION. SOME RESEARCH ON IMPROVED SEALING TECHNIQUES IS UNDERWAY, BUT MUCH HAS YET TO BE LEARNED AND APPLIED. /AUTHOR/

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  • Accession Number: 00211344
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Dec 9 1994 12:00AM