Frameworks for Microsurfacing and Chip Seal Project Selection: The Key to Long-Term Performance
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1 Frameworks for Microsurfacing and Chip Seal Project Selection: The Key to Long-Term Performance Doug Gransberg, PhD, PE! Iowa State University! Construction Engineering Division! 1!
2 Background! The Pavement Preservation mantra:!! Place the right treatment, on the right road, at the right time (Galehouse, Moulthrop, & Hicks, 2003)!! Project Selection = Right road & time!! Chip Seal & Microsurfacing have no structural capacity!! Cannot repair failed pavement!! Will fail early is placed on the wrong substrate.! 2!
3 Pavement Preservation Project Selection Factors! Evaluate pavement distresses in substrate!! Evaluate surface texture;!! Evaluate traffic conditions: volume, speed, percentage of trucks, need for traffic control etc.;!! Evaluate climatic and seasonal characteristics;!! Evaluate options available aggregate selection;! 3!
4 Surface Distress: Rutting! Rut cause!! Mix instability/structural failure: not a PPT candidate!! Layer densification/abrasion: Chip seal if!! Rut depth < Average Least Dimension (M) of Chip!!Depth > M: Micro to fill ruts prior to PPT! !"#$%&'%()*)+,)-"%$ 0 Schematic of McLeod s Failure Criteria (after Lee and Kim 2009). -".(/)!"#$%&'%( 4!
5 Surface Distress: Oxidation/Raveling! With severe map cracking no PPT!! Severe raveling Chip seal!! General double treatment!! Localized single treatment with chip large enough to fill voids left by raveling!! Minor cracking - Microsurfacing! 5!
6 Surface Distress: Bleeding! Amount of bleeding/flushing determines appropriate treatment!! Minor/localized: Chip seal!! Minor/localized to the wheel paths: Micro!! Major/localized to the wheel paths: Retexture prior to PPT to remove excess bitumen!! Shotblasting!! Micromilling!! Ultra High Pressure Watercutting! 6!
7 Shotblasting Before After 7!
8 Micromilling 8!
9 Watercutter Retexturizing in New Zealand BEFORE AFTER 9!
10 Surface Distress: Friction Loss! Reason for friction loss drives PPT selection!! Bleeding in wheel paths retexture to regain skid numbers no need for surface treatment!! Polishing Micro or chip seal!! Strip seal!! Micro in the wheel paths only!! If minor rutting,! either full width!! Greater rutting, micro rut fill + full width! 10!
11 Surface Texture/Hardness! Important not to add bitumen where there is already too much.!! Use data to select aggregate size/gradation!! Soft surface = early failure from flushing/loss of skid resistance.!! Measure using! TNZ T/3 Sand Circle! Test or ASTM Sand! Patch.! 11!
12 Traffic Conditions! Traffic-related PPT selection issues!! Time to open to traffic!! Cost of traffic control!! Congestion in work zones!! Night work!! Aggregate whip-off windshield breakage!! Binder whip-off Claims for removal from paint!! Local sensitivity to construction issues!! Upper management sensitivity to complaints! 12!
13 Traffic Conditions! Post construction issues!! Road noise!! Need for drainage!! Maintenance of skid numbers!! Chip seal! ü! Traffic control during cure! ü! Temperature sensitivity during night work! ü! Big chips! ü! High road noise! ü! Great drainage!! Microsurfacing! ü! Open to traffic fast! ü! Not as sensitive to cool temperatures! ü! Little chips no whip-off! ü! Low road noise! ü! Low drainage! 13!
14 Climatic and Seasonal Conditions! Length of season!! Let as early as possible to give maximum time to install without temperature constraints!! Potential for sudden rain showers!! Need to snow plow; Use of chains/studded tires!! Chip seal more temperature/weather sensitive than micro! 14!
15 Available Aggregate! Aggregate quality!! Aggregate degradation during construction changing the gradation on the road s surface!! Aggregate degradation after construction polishing, fracturing!! Micro requires high quality aggregate!! time since crushing: hot rock surface free energy!! Chip seal!! Minimize number of times it is handled!!! 15!
16 Microsurfacing Framework - Asphalt 16!
17 Summary! PPTs are shown to be cost effective IF:!! Applied to good substrate!! Applied with a bias to long-term performance versus a bias to short-term complaints!! MUST characterize the surface before selecting PPT!! Need to DESIGN these treatments rather than treat like a commodity.!! Local knowledge trumps research! 17!
18 Questions??? 18!
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