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

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Pavement Maintenance Table 14 - Emulsion application rate adjustments Surface texture 58 Cornell Local Roads Program Adjustment (in Gallons/s.y.) Black, flushed asphalt - 0.01 to -0.06 Smooth, nonporous none Absorbent - slightly porous, oxidized +0.03 Absorbent - slightly pocked, porous, oxidized +0.06 Absorbent - badly pocked, porous, oxidized +0.09 Average daily traffic (vehicles per day) Adjustment Under 100 +15% 100-500 +5% 500-1000 None 1000-2000 -5% Over 2000 -10% Surface preparation Crack repairs and patching should be done at least three months ahead of chip sealing. Depressions, ruts, and bumps should be filled. Due to the short construction season, it is better to do such work the previous year if possible. Even with a rubber-tired roller, a smooth road is easier to surface-treat. The smoother the surface, the better the resulting chip seal. A day before the chip seal is to be done, the surface should be broomed. This can be done several days in advance if necessary. It is better to do it early than not at all. Equipment preparation and calibration The equipment needs to be prepared and calibrated before use. All the mechanical parts need to be checked. The aggregate spreader (Figure 36), or the chipper boxes, definitely need to be checked to make sure they are working properly, the chutes are open, and the correct aggregate spread rate is being applied. The distributor nozzles must be correctly aligned (Figure 37), and the spray-bar height set properly for complete overlap (Figure 38). A triple lap is usually recommended. If either is set up incorrectly, streaking will occur. Prior to application on the road, the chipper and the distributor should be calibrated. The calibration test will also allow a check of the working operation of all of the equipment. To calibrate the stone rate, place a one-square-yard canvas panel on the ground. Have the chipper spread stone across the panel (it may be necessary to anchor the panel). Weigh the stones on the panel. The amount of stone should closely match the figure calculated for the application rate. If chipper boxes are being used, each box needs to be calibrated separately.
Single lap Double lap Triple lap Figure 36 - Self-propelled aggregate spreader CORRECT - Nozzles at same angle INCORRECT - Nozzles at different angles Figure 37 - Spray bar alignment Nozzles . Spray Bar Road Surface Figure 38 - Spray lap coverage 8 - Thin Wearing Courses 15-30° Variable angle Cornell Local Roads Program 59
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Pavement Maintenance Cornell Local
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PREFACE Millions of dollars are spe
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TABLE OF CONTENTS Chapter 1. Introd
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List of Tables Table 1 Average dist
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Pavement Maintenance Table 1 - Aver
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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 and 30: Figure 5 - Sealed longitudinal crac
Page 31 and 32: Edge cracking 4 - Pavement Distress
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 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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