Ohio Township Association
“Pavement Preservation-ODOT
Leading the Way”
Topics Discussed
• ODOT’s new pavement preservation program
• How townships can take advantage of the new changes
• New specification information
• How pavement preservation allows townships to spread
their budget $’s further
Applications Discussed
• Overband Crack Seal---ODOT Spec #423
• Mastic Surface Treatments
• Micro Surfacing---ODOT Spec #421
• Cape Seals---light & heavy uses
Big Changes to ODOT Coming!
Overband Crack Seal – ODOT Spec #423
Overband Crack Seal
Type 1 – “BLOCKED” with 18% Rubber
– Flows to lowest point
– Can’t be put down in Overband
Type 2 – “LIQUID” with 5% Polyester
Type 3 – “LIQUID” with 7% Polypropylene
Type 4 – “BLOCKED” with 2% Polyester
Overband Crack Seal - Blocked
5,000 lbs. / day @ 7 ft. / lb..
Overband Crack Seal - Liquid
7,000 lbs. / day @ 5 ft. / lb..
Overband Crack Seal – Installed Properly
Overband Crack Seal – Installed Poorly
Overband Crack Seal
Overband Crack Seal
• Temperature - 45 degrees and rising
• Width of Crack – 1/4” – 1”
• Product Thickness – 1/16” – 1/8”
• Bandwidth - 5” disc installs 4” wide product
• Pay Item – Pound or Square Yard
City of Columbus, OH
Overband Crack Seal
Mastic Surface Treatment
When:
2-4 years after new
pavement is installed
Result:
Additional 5 years
pavement service life
What is it
A sprayed on seal with a unique blend of
aggregate and polymer to help seal your
pavement, arrest oxidation, while
extending the life of asphalt or chip seal
surfaces
Components
• Cationic Polymerized Asphalt Emulsion – CSS-1HM
– Single Cut Emulsion at Central Plant
– .25 gallon /sy @ 10 lbs./gallon = 2.5 lbs./sy
– End result more comparable to Micro than Fog Seal
– Double Application – Both Directions in Each Lane
• Quality “Fine” Aggregate – “Silica Sand”
• Dark Color Enhancers – “Carbon Black”
• Breaking and Setting Additives
Benefits
Applications
-Seals the pavement
State, County and Townships
-Arrests oxidation
•
High-Volume Priority Shoulders
-Maintains good surface
friction
•
Low-Volume General Mainline
•
Chip Seal “Seal”
-Consistent black color
(Aesthetics)
•
Rest Stops
-Locks in chip seals and
(controls dust
Local
•
Low-Volume Residential Streets
-Extremely economical
•
Parks and Cemeteries
-3-4 year life extension
•
Large Commercial Parking Lots
MST – Material Distributor
MST – Side Panel Protection
MST - Handwork
Chip Seal Surfaces: # 8 Limestone
Asphalt Surfaces-1 Year Later
Chip Seal Surfaces: # 9 Limestone
Using a smaller aggregate provides a smoother ride for the public
Up Close
Before
Oxidizing and Raveled Asphalt – “Before”
After
Oxidized and Raveled Asphalt – “After”
Older Asphalt with Onyx – Residential Subdivision
Video
Close up of Mat with Aggregate
After
Micro Surfacing – ODOT Spec #421
What is it
• A thin, tough Layer of asphalt
emulsion designed to help seal your
pavement, fill minor rutting, arrest
oxidation, and extend the life of an
asphalt or chip seal surface
Components
•
Polymerized Asphalt Emulsion
•
•
Limestone Aggregate
•
•
Chemical Break and Cure
Portland Cement
•
Benefits
3/8” to P200’s
Breaking and Setting Additives
•
•
Natural Latex
Cohesiveness
Micro Surfacing
• Seals the pavement
• Can fill ruts up to 1”
• Arrest Oxidation / Minor Raveling
• Provides a tough wearing surface
• Fast Installation and Cure Time
• ½ the cost of 1 ½” of asphalt
• Improves surface friction
Newly Installed
Micro Surfacing
Micro Surfacing
10 – 15 minutes
Turns Black
1 -1 ½ hours
Return Traffic
Truck Mount Unit
Micro Surfacing
Continuous Unit
Micro Surfacing – Surface Course
• Single Course – 18 lbs. /sy
• Heavy Single Course – 20 to 24 lbs. / sy
Micro Surfacing – Double Course
Good Candidate
• Leveling Course – 14 lbs. / sy and Surface Course - 16 lbs. / sy
• Double Course = 30 lbs./sy
Continued
Ohio DOT – Preparatory Work “Before”
After
Ohio DOT – Northern Ohio (After)
Overband Crack Seal with Micro Surfacing
Polymerized Chip Seal with Micro Surfacing
Ohio Township Association
Micro Surfacing
ODOT Spec 421.11 Acceptance
“The pavement is free from excessive scratch marks,
tears, rippling and other surface irregularities, …
joints are uniform, neat and provide a smooth transition.”
Northern Ohio Township
Micro Surfacing
ODOT Pavement Preservation Study
2010 Chip Seal and Micro Surfacing Study
Thin HMA (< 1 ½”)
$66,358/lm
9 Years
Micro (4 Lane)
$26,350/lm
8 Years
Micro (2 Lane)
$17,450/lm
9 Years
Chip Seal
$11,500/lm
3-5 Years
Southern Ohio Township
Cape Seal
What is it
• A tough wearing surface that combines a chip seal with a
micro surfacing treatment
• Designed to treat pavements that are structurally sound but
have a higher level of surface distress.
Benefits
• Provides tough, dense
wearing application
Can be placed on a #8 or # 9 Stone
Cape Seal
Light Cape Seal
L
Number 8 stone
Number 9 stone
• Creates a great seal
• Smoother Surface
-1/2” Stone
-1/4” Stone
• Improves bleeding issues
-for more severe cracking
-for lighter cracking
-requires more liquid
-requires less liquid
-more expensive
-less expensive
-rides rougher
-rides smoother
-Minimum 20lbs of micro
-Minimum 18lbs of micro
• 8 to 10 year life expectancy
• More economical than a
conventional overlay
Example Candidate
Covered with Micro Surfacing
Cape Seal---NW Ohio---10 Years Old!
Project Complete in Summer of 2005
Picture taken Summer of 2015
Ohio Township Association
Thank you
-Tim Herbst
-Zack Helm
-Ryan Terry
Cape Seals vs. Overlay Cost