Guidelines for the Preservation of High-Traffic-Volume Roadways (2011) / Chapter Skim
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Appendix A - Preservation Treatment Summaries
Appendix A - Preservation Treatment Summaries
Pages 32-46
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From page 32... ...
Preservation Treatment Summaries A P P E N D I X AThis appendix contains technical summaries for each of the preservation treatments covered in this document. The summaries, which are presented in a tabular format, include treatment descriptions, the key pavement conditions they32address, and construction and other considerations (including expected performance and estimated costs)
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From page 33... ...
at the pavement surface in order to prevent the infiltration of moisture into the pavement structure. Crack sealing operations typically require good crack preparation (i.e., routing or sawing a reservoir over the crack and power cleaning the reservoir)
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From page 34... ...
Slurry seals are effective in sealing low-severity surface cracks, waterproofing the pavement surface, and improving friction at speeds below 30 mph. Functional/Other • Longitudinal cracking • Transverse cracking • Raveling/weathering • Friction loss • Moisture infiltration • Roughness • Special consideration should be given to raised pavement markers and bump grinding prior to treatment placement.
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From page 35... ...
A double application involves a rut-filling application followed by a full-lane width application. Functional/Other • Longitudinal cracking • Transverse cracking • Raveling/weathering • Friction loss • Moisture infiltration • Bleeding • Roughness • Special consideration should be given to raised pavement markers and bump grinding prior to treatment placement.
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From page 36... ...
Functional/Other • Longitudinal cracking • Transverse cracking • Block cracking • Friction loss • Bleeding • Roughness • Moisture infiltration • Application rates depend upon aggregate gradation and maximum size, as well as absorption of existing pavement surface. • Special consideration should be given to raised pavement markers and bump grinding prior to treatment placement.
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From page 37... ...
Table A.5. Technical Summary for Ultra-Thin Bonded Wearing Course T re a tm e n t D e sc ri p ti o n C o n d it io n s A d d re ss e d Structural: Treatment does not add structural benefit, but does retard fatigue cracking and can address stable rutting less than 0.5 in.
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From page 38... ...
• Pavement surface must be dry and swept clean of dirt, sand, gravel, and other surface contaminants; a tack coat applied prior to overlay application will improve bond to existing surface. • Because thin and ultra-thin HMA overlays dissipate heat rapidly, it is important to specify minimum placement temperatures and to obtain timely compaction.
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From page 39... ...
• Pavement surface must be dry and swept clean of dirt, sand, gravel, and other surface contaminants. • Like HMA overlays, treatment can be opened to traffic after approximately 1 to 2 hours.
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Technical Summary for Cold In-Place Recycling T re at m en t D es cr ip ti o n C o nd it io ns A d d re ss ed Structural: CIR may add some structural benefit if additional surfacing is placed, and it will reduce surface rutting. As a preservation treatment, CIR is not recommended where there are excessive subgrade failures, wide cracking, or HMA thickness less than 3 in.
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From page 41... ...
Table A.9. Technical Summary for Ultra-Thin Whitetopping T re at m en t D es cr ip ti o n C o nd it io ns A d d re ss ed C o ns tr uc ti o n C o ns id er at io ns O th er R em ar ks A d d it io na l R es o ur ce s M is ce lla ne o us C o ns id er at io ns Structural: UTW provides structural benefit, bonding to the existing HMA to increase loadcarrying capacity.
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From page 42... ...
C o ns tr uc ti o n C o ns id er at io ns O th er R em ar ks A d d it io na l R es o ur ce s M is c e lla n e o u s C o n si d e ra ti o n s Treatment Life (yr) : • Joint resealing: 2 to 8 • Crack sealing: 4 to 7 Pavement Life Extension (yr)
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From page 43... ...
Diamond grinding removes joint faulting and other surface irregularities, thereby restoring a smooth-riding surface while also increasing surface friction and reducing noise emissions. Diamond grooving consists of cutting narrow, discrete grooves into the pavement surface, which helps to reduce hydroplaning, vehicle splash and spray, and wet-weather crashes.
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Concrete Pavement Preservation Workshop -- Reference Manual. Federal Highway Administration, U.S.
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Functional/Other • Longitudinal cracking • Transverse cracking • Divided slab • Corner breaks • Joint spalling • Punchouts • Blowups • D-cracking or ASR distress* • It is important to properly prepare the base, restore joint load transfer, and finish, texture, and cure the patch material per governing specifications.
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From page 46... ...
, corrosion of existing load transfer devices, and poor pavement drainage resulting in loss of underlying support. Functional/Other • Joint faulting • Pumping • Corner breaks • There are different patterns for placing dowel bars in a load transfer restoration project, but the use of three or four dowel bars clustered in each wheel path is typical.
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