Pavement Markings in Nevada

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Pavement Markings in Nevada

• Gayle Maurer
• Staff Materials Specialist
• Nevada Department of Transportation (NDOT)

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Outline

• Background
• NDOTs Pavement Marking Task Force
• NDOTs Pavement Marking Research Test Sections

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Durability of pavement markingmaterials has been
identified as an important operational issue
within NDOT during the past years.
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To identify factors leading to poor traffic paint
performance and provide solutions NDOT
established

• Pavement Marking Task Force
• Advancing Durable Pavement Markings in Nevada
  Research Project

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• Pavement Marking Task Force focuses on improving
  striping operations and specifications including
  material, performance, and warranty
  specifications.
• Advancing Durable Pavement Markings in Nevada
  Research Project focuses on field and laboratory
  testing to develop a matrix that will list
  pavement marking materials to be used under given
  climatic, traffic, and pavement conditions.

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Outline

• Background
• NDOTs Pavement Marking Task Force
• NDOTs Pavement Marking Research Test Sections

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The Task Force Identified Major Factors Leading
to Poor Performance

• Environmental and material
• Installation procedures and lack of experience
• Inadequate inspection procedures and sealing of
  rumble strips
• 10-day maximum time between temporary and
  permanent striping
• Inability to handle the demand of the striping
  season

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Task Force Recommendations

• Maintenance forces will stripe more rural
  waterborne paint contracts
• Improve paint sampling procedures
• Develop construction inspection program
• Update contract specifications
• Establish initial performance criteria and
  warranty specifications

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Outline

• Background
• NDOTs Pavement Marking Task Force
• NDOTs Pavement Marking Research Test Sections

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Goal Pavement Marking Matrix
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Research Test Sections

• Total of 30 pavement marking products
• 10 waterborne traffic paint products
• 4 alkyd thermoplastic products
• 6 polyurea, 6 epoxy, and 4 permanent tape
  pavement marking products
• Sections are monitored for color, durability, and
  reflectivity readings
• All long line application (edge, median, and
  centerlines)

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Advancing Durable Pavement Markings in Nevada
Research Project

• Test Sections
• SR028 Washoe Cnty (MP 0.00 8.00)
• SR431 Washoe Cnty (MP 4.00 5.50)
• US050 Churchill Cnty (MP 31.42 43.76)
• US093 Clark Cnty (MP 59.00 - 70.00)
• US095 Clark Cnty (MP 63.50 66.50)

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SR028 Test SectionsOne-year
Findings All waterborne traffic paint
products deteriorated at the same rate. This
area was striped in September, 2002 and
snowplowed hundreds of times throughout the
winter. These sections did not last one-year and
required restriping as soon as the spring
conditions would permit.
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SR028 Test Sections
Winters are rough on long line striping in the
Sierras.
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SR028 Test Sections
2.5 months old (slight snowplow damage, sand,
and anti-icing agents)
5 months old (heavy snowplow damage, sand, and
anti-icing agents)
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One-year Findings These sections were placed
with manufacturers recommended grind depth.
These sections will last 6 or more times longer
than SR028 sections where products were not
inlaid. Products would probably last even
longer with a deeper grind as plow chatter caused
some distress. Recommend minimum 250 mil grind
depth as snowplows shear off about 60 mils of
surface a winter.Salt-brine solution and
anti-icing agents can cause color to appear faded
after a season of application and color can
return to acceptable levels after spring rains
wash the lines.Several polyurea paint
sections were reused in September, 2003. Two
types of permanent tape along with waterborne
paint were placed in a ¼-inch grind.
SR431 Test Sections
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SR431 Test Sections
Surface preparation and properly running striping
equipment are essential for getting quality lines.
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SR431 Test Sections
One-year evaluation displays acceptable
durability, color, and reflectivity readings for
most products on the test sections.
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US050 Test
SectionsOne-year Findings All 25 wet mils
with Type B beads at 9 lbs/gal applications are
deteriorating similarly. Type A beads have
higher reflectivity readings than Type B beads
for both 9 and 12 lbs/gal application rates
when similarly compared. 18 wet mils paint
application rate with Type B beads lasted
approximately 6 months.
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US050 Test Sections
Waterborne paint applied at 18 wet mils with 9
lbs/gal Type B beads.
Waterborne paint applied at 25 wet mils with 12
lbs/gal Type B beads.
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US050 Test Sections
Waterborne paint applied at 25 wet mils with 9
lbs/gal Type A beads.
Waterborne paint applied at 25 wet mils with 9
lbs/gal Type A beads.
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US050 Test Sections
New Pavement Marking Day 1
Pavement Marking at One-year
Pavement Marking at One-year
One-year evaluation indicates reflectivity and
color readings are adequate for most sections,
with some durability loss due to nominal snowplow
use in this region.
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One-year Findings All white color markings
display excellent durability, color, and minimum
of 345 mcd/(m2lx) after one year. All yellow
color markings display good durability, color,
and minimum of 165 mcd/(m2lx) after one year.
The white colored products should easily last
a minimum of two-years.
US093 Test Sections
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Application in Rural Nevada
State Forces applied waterborne paint products
for all the test sections.
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One-year Findings All products are performing
adequately at this time. All products show
decreasing reflectivity levels over time with the
exception of both brands of yellow colored alkyd
thermoplastic pavement materials, these two
materials show increased reflectivity levels
after one-year.
US095 Test Sections
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US095 Test Sections
Good surface preparation and adequate application
thickness will ensure these lines reach desired
service life.
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Conclusions

• Customize and optimize pavement marking
  operations based on
• Surface preparation
• Types of products
• Installation procedures
• Inspection and warranty

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Conclusions

• Develop a Pavement Marking Management System
  (PMMS) based on
• Application databases that would include a
• cost-effectiveness factor
• QA/QC program that includes
• Contractor permanent striping and NDOT restriping
  schedules including District contracts with
  warranty
• Criteria for evaluation of restriping conditions
• Use of reflectivity, durability, and color value
  guidelines to improve quality of striping program

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Questions?775.888.7252gmaurer_at_dot.state.nv.us