Potholes: Prevent Before They Present
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1 : Prevent Before They Present Dave Bergner, M.A., PWLF Mike Hale, P.E., P.L.S, M.S.C.E. TRB/ AASHTO Transportation Infrastructure Maintenance and Operations Conference, July 21, 2015 Des Moines, IA c. Monte Vista Associates, LLC, FINAL TRB M&O Conference
2 irritating to drivers, source of many complaints cost millions of dollars annually in vehicle repairs cause accidents add to delays and increased congestion indicative of other problems c. Monte Vista Associates, LLC, FINAL TRB M&O Conference
3 defined: potholes are at least 2 deep with pronounced edges caused by sub-surface deterioration c. Monte Vista Associates, LLC, FINAL TRB M&O Conference
4 What are not potholes: depressions in unpaved roads rutting shoving or wash-boarding transverse cracks delamination punch-outs Sinkholes, wash-outs Failed utility cuts buckling c. Monte Vista Associates, LLC, FINAL TRB M&O Conference
5 Prevention begins with good construction Paving in New York City, 1870s c. Monte Vista Associates, LLC, FINAL TRB M&O Conference
6 Roman road-builders had the right ideas: first paved roads built of gravel, cobbles, flagstones graded, layered, crowned, ditches for drainage lasted for hundreds of years same principles used today c. Monte Vista Associates, LLC, FINAL TRB M&O Conference
7 Modern pavement design good drainage essential cross-slope grade shoulders ditches and culverts curb and gutter storm-water inlets retaining walls bridge and overpass piers c. Monte Vista Associates, LLC, FINAL TRB M&O Conference
8 Most potholes form in winter water penetrates, dissolves, erodes embedded water freezes, expands ice thaws, leaves void vehicles exert dynamic loading pavement over-flexes, breaks water infiltrates, weakens base traffic wears away broken pavement water ponds in the hole c. Monte Vista Associates, LLC, FINAL TRB M&O Conference
9 But potholes also occur in warm weather: poor drainage accumulates water under pavement traffic forces surge of water due to compression surge washes away poorly compacted base resulting void cannot support pavement c. Monte Vista Associates, LLC, FINAL TRB M&O Conference
10 regular pavement maintenance a preventive practice: crack-sealing surface sealers; rejuvenators patching resurfacing chip seal micro-seal mill and overlay c. Monte Vista Associates, LLC, FINAL TRB M&O Conference
11 Defects that foretell potholes: alligator cracking indicates structural problems block cracking from environmental actions ponding in depressions c. Monte Vista Associates, LLC, FINAL TRB M&O Conference
12 Aggressive corrective measures: base repairs wedging to eliminate low spots spot-milling to eliminate ruts better inspection of utility cut repairs Cleaning ditches and curb inlets find and fix systematic patrol Quick response to complaints c. Monte Vista Associates, LLC, FINAL TRB M&O Conference
13 shoulders Drainage systems maintenance: keep the water moving! ditches and culverts curbed streets inlets or catch basins snow and ice operations Springs and seeps Water system leaks, over-irrigation of lawns c. Monte Vista Associates, LLC, FINAL TRB M&O Conference
14 Pothole repair methods: cold patch hot- patch spray injection automated c. Monte Vista Associates, LLC, FINAL TRB M&O Conference
15 Worker safety one of the more dangerous tasks for maintenance personnel hi-vis vests signs, message boards warning lights on vehicles flagger(s) follow-truck police presence c. Monte Vista Associates, LLC, FINAL TRB M&O Conference
16 Pothole Data Analysis Complete and precise documentation vital Operational---effectiveness of methods and materials Systematic--- develop schedule for concentrated corrective actions to prevent recurrence Programmatic--- use data with PCI to assess overall condition of pavement c. Monte Vista Associates, LLC, FINAL TRB M&O Conference
17 Information and References: The Hole Story APWA bookstore Anatomy of a Pothole VDOT: Phil Itkwik Is Back Hunting! c. Monte Vista Associates, LLC, FINAL TRB M&O Conference
18 Questions? Comments? c. Monte Vista Associates, LLC, FINAL TRB M&O Conference
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