Pavement Maintenance - Cornell Local Roads Program - Cornell ...

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Pavement Maintenance Block cracking Block cracking is an interconnected series of cracks that divides the pavement into irregular pieces. This is sometimes the result of transverse and longitudinal cracks intersecting. They can also be due to lack of compaction during construction. Low severity block cracking may be repaired by a thin wearing course. As the cracking gets more severe, overlays and recycling may be needed. If base problems are found, reclamation or reconstruction may be needed. Figure 7 shows medium to high severity block cracking. Figure 7 - Medium to high severity block cracking Slippage cracking Slippage cracks are half-moon shaped cracks with both ends pointed towards the oncoming vehicles. They are created by the horizontal forces from traffic. They are usually a result of poor bonding between the asphalt surface layer and the layer below. The lack of a tack coat is a prime factor in many cases. Repair requires removal of the slipped area and repaving. Be sure to use a tack coat in the new pavement. Reflective cracking Reflective cracking occurs when a pavement is overlaid with hot mix asphalt concrete and cracks reflect up through the new surface. It is called reflective cracking because it reflects the crack pattern of the pavement structure below. As expected from the name, reflective cracks are actually covered over cracks reappearing in the surface. They can be repaired in similar techniques to the other cracking noted above. Before placing any overlays or wearing courses, cracks should be properly repaired. 20 Cornell Local Roads Program
Edge cracking 4 - Pavement Distresses Edge cracks typically start as crescent shapes at the edge of the pavement. They will expand from the edge until they begin to resemble alligator cracking. This type of cracking results from lack of support of the shoulder due to weak material or excess moisture. They may occur in a curbed section when subsurface water causes a weakness in the pavement. At low severity the cracks may be filled. As the severity increases, patches and replacement of distressed areas may be needed. In all cases, excess moisture should be eliminated, and the shoulders rebuilt with good materials. Figure 8 shows high severity edge cracking. Figure 8 - High severity edge cracking Surface deformation Pavement deformation is the result of weakness in one or more layers of the pavement that has experienced movement after construction. The deformation may be accompanied by cracking. Surface distortions can be a traffic hazard. The basic types of surface deformation are: 1. Rutting 2. Corrugations 3. Shoving 4. Depressions 5. Swell Cornell Local Roads Program 21
Page 1: Pavement Maintenance Cornell Local
Page 5 and 6: PREFACE Millions of dollars are spe
Page 7 and 8: TABLE OF CONTENTS Chapter 1. Introd
Page 9: List of Tables Table 1 Average dist
Page 12 and 13: Pavement Maintenance Table 1 - Aver
Page 15 and 16: 2 - Why Roads Fail Prematurely ____
Page 17 and 18: 2 - Why Roads Fail Prematurely Gene
Page 19 and 20: 2 - Why Roads Fail Prematurely Usin
Page 21: 2 - Why Roads Fail Prematurely Main
Page 24 and 25: Pavement Maintenance Thin wearing c
Page 27 and 28: 4 - Pavement Distresses ___________
Page 29: Figure 5 - Sealed longitudinal crac
Page 33 and 34: Figure 10 - Shoving of asphalt surf
Page 35 and 36: Surface defects 4 - Pavement Distre
Page 37: Figure 15 - Overlay delamination 4
Page 40 and 41: Pavement Maintenance Preventive mai
Page 42 and 43: Pavement Maintenance Table 4 - Pave
Page 44 and 45: Pavement Maintenance Table 5 shows
Page 46 and 47: Pavement Maintenance Flush-fill The
Page 48 and 49: Pavement Maintenance Cracks should
Page 50 and 51: Pavement Maintenance Material finis
Page 52 and 53: Pavement Maintenance Construction o
Page 54 and 55: Pavement Maintenance Spray patching
Page 56 and 57: Pavement Maintenance “Throw and R
Page 58 and 59: Pavement Maintenance Table 10 - Dis
Page 60 and 61: Pavement Maintenance Micropaving Mi
Page 62 and 63: Pavement Maintenance Toughness The
Page 64 and 65: Pavement Maintenance For use in thi
Page 66 and 67: Pavement Maintenance Residual Aspha
Page 68 and 69: Pavement Maintenance Table 14 - Emu
Page 70 and 71: Pavement Maintenance To calibrate t
Page 73 and 74: APPENDIX A - CRACK TREATMENT MATERI
Page 75 and 76: APPENDIX C - VIDEOS The following v
Page 77 and 78: New York State Conference of Mayors
Page 79 and 80: APPENDIX F - GLOSSARY AASHTO - Amer
Page 81:
Appendix F - Glossary Pavement Reha
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