1. No category

TOWN OF NEW CASTLE
DEPARTMENT OF
PUBLIC WORKS
POTHOLES & OTHER FORMS OF
PAVEMENT DISTRESS
March 24, 2015
PAVEMENT DISTRESS
• Four Major Categories
– Disintegration (potholes, etc.)
– Cracking
– Surface Deformation
– Surface Defects (bleeding, etc.)
TOWN OF NEW CASTLE DPW
2
DISINTEGRATION
• Potholes
– Disintegration is the
progressive breaking up of
pavement.
– Caused by moisture
infiltration and usually
alligator cracking.
– Can be repaired with
patching, depending on
severity.
TOWN OF NEW CASTLE DPW
3
CRACKING
• Fatigue Cracking
– aka Alligator Cracking
– Caused by traffic loading
and base and drainage
conditions.
– Can be repaired by patch
or area repair.
• Traverse & Longitudinal
Cracking
– Caused by thermal issues.
– Can be repaired by sealing,
patching or area repair.
TOWN OF NEW CASTLE DPW
4
SURFACE DEFORMATION
• Depressions
aka Bird Baths
– Caused by localized
consolidation or movement
of supporting layers
beneath surface.
– Can be repaired with
patching.
• Swells
– Caused by localized
upheaval movement in
pavement due to swelling
due to frost.
– May require reconstruction.
TOWN OF NEW CASTLE DPW
5
POTHOLE CAUSES
• Potholes are generally
caused by moisture,
freeze-thaw action,
material fatigue, traffic,
poor underlying
support, or some
combination of these
factors.
• Pavement chunks are
dislodged, resulting in a
pothole
TOWN OF NEW CASTLE DPW
6
POTHOLE REPAIR OPERATIONS
Pothole repair operations can usually be
divided into two distinct periods:
• Winter repairs
• Spring repairs
TOWN OF NEW CASTLE DPW
7
Winter Repair Operations
• Temperatures are low
• Base material is frozen
• Additional moisture and freeze-thaw
cycles are expected
• Any repairs are very temporary
• Repairs may be “cold patch”
• Placement of “loose millings”
TOWN OF NEW CASTLE DPW
8
Spring Repair Operations
• Base material is wet and soft
• Few additional freeze-thaw cycles are expected
• Repairs are “semi-permanent” provided that the
ground and air temperatures are above freezing
• Ideally, air temperatures should be above 45 F
• We use “hot box” to reheat re-usable mix
• If plants are open, we use fresh asphalt
• Potholes must be dry
TOWN OF NEW CASTLE DPW
9
“HOT BOX”
Used to Place Heated Asphalt Mix Into Potholes
TOWN OF NEW CASTLE DPW
10
POTHOLE REPAIR TECHNIQUES
1.
2.
3.
4.
5.
Remove loose debris
from pothole
Dry out the pothole by
forced air and/or heat
Coat inside of hole with
“tack coat”
Place hot mix asphalt
into hole
Use vibratory compactor
to “pack in place”
Picture of a Pothole
TOWN OF NEW CASTLE DPW
11
POTHOLE REPAIRS
STEP 1 – Remove loose debris
TOWN OF NEW CASTLE DPW
12
POTHOLE REPAIRS
STEP 2 – Dry out the pothole
TOWN OF NEW CASTLE DPW
13
POTHOLE REPAIRS
STEP 3 – Coat inside with “tack coat”
TOWN OF NEW CASTLE DPW
14
POTHOLE REPAIRS
STEP 4 – Place hot mix asphalt
TOWN OF NEW CASTLE DPW
15
POTHOLE REPAIRS
STEP 5 – Compact asphalt into hole
TOWN OF NEW CASTLE DPW
16
GENERAL REPAIR TECHNIQUES
• Patching
– Patching is done year-round and can be very
economical. Patching will do the following:
• Fill potholes
• Repair of:
– Ruts
– Slippage
– Pavement defects
– Does not address base defects.
TOWN OF NEW CASTLE DPW
17
GENERAL REPAIR TECHNIQUES CONT’D
• Area Repairs
– Unlike patching, area repairs involve a more
extensive repair.
– Area repairs involve a cut out and
replacement of a bad section of road.
– Relatively expensive, however it does
address base problems and is not wasteful.
– Best alternative to small areas of distress.
TOWN OF NEW CASTLE DPW
18
GENERAL REPAIR TECHNIQUES CONT’D
• Reclamation
– Improves base.
– Grading is done to re-establish the “crown.”
– Various binder compounds may be used in the
recycled base.
– When completed properly, it provides an almost new
road.
– Technique was first done in Westchester, in New
Castle, 29 years ago.
– Very cost-effective.
– Will continue to be used in New Castle as needed.
TOWN OF NEW CASTLE DPW
19
ROAD MAINTENANCE
•
Four different categories:
– Demand
• Technique to correct hazard or service request.
• Spring pothole repairs is command demand maintenance.
– Routine
• Routine basis for operational reasons.
• Examples: Mowing grass, cutting shoulders, and road stripping.
– Preventative
• DRAINAGE IMPROVEMENTS ! ! !
• Prevention of significant deterioration, extension of pavement life.
• Planned surface treatments.
– Corrective
• Repair pavement failures after they have occurred.
• Generally costs more than preventative or routine maintenance.
TOWN OF NEW CASTLE DPW
20
ANY QUESTIONS ?
• Please contact DPW at 238-3968
• Please post messages regarding potholes
at: [email protected]
Presentation prepared by Golden and Moerschell, with photography by Carey
TOWN OF NEW CASTLE DPW
21