2016 county engineer’s workshopctt.mtu.edu/sites/ctt/files/resources/cew2016/02moomaw.pdf · 2016...
TRANSCRIPT
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February 2, 2016
2016 County Engineer’s WorkshopManistee, Michigan
Presented By:Tim Moomaw, WSDOT Construction Trainer
WSDOT Chip Seal Program
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Presentation OverviewThis presentation will review the past, present and future use of Chip Seals in Washington State.In 2014, WSDOT received SHRP 2 Implementation funds to assess the use of Chip Seals for high traffic volume routes. Review of this project for Q & A.
WSDOT Chip Seal Program
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Negative PerceptionsChip Seals “can’t / shouldn’t” be done
Too high of traffic levels Won’t improve the road Breaks windshields Not for bicycles
WSDOT Chip Seal Program
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0
500
1000
1500
2000
Lane
Mile
s
Preservation Projects
WSDOT Chip Seal Program
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Presentation Overview
WSDOT PavementPreservation Strategies
WA State Senate requests information on business practices in 2010.
WSDOT Chip Seal Program
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Communication Plan
Commitment to Transparency
Quarterly Performance Report
March 2015 Edition
WSDOT Chip Seal Program
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Communication Plan
City of Shoreline, WA
Promo Video//www.youtube.com/watch?v=wzN-kqQI9s4
WSDOT Chip Seal Program
www.youtube.com/watch?v=DiQ2YsbwvTg
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Connecting Washington
WSDOT Chip Seal Program
$16 billion package 11.9-cent gas tax increase (62₵/Gal) $1.4 billion for preservation (16 yrs)
Transportation Package
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Geographic Challenges
Dry & Arid Eastern Washington
Mild Coastal Region
Mountain Passes
WSDOT Chip Seal Program
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Optimal Timing
WSDOT Chip Seal Program
Dependent on the existing pavement structure, each pavement condition will have a corresponding corrective action.
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Chip Seal Best Practices
Chip Seal Best Practices NCHRP Synthesis 342 Highlighted QA/QC Measures 40 best practices identified Racked-in-Seal described
WSDOT Chip Seal Program
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Chip Seals SystemsSystems Selection
Type of binder Gradation of aggregate Number of “courses” Types of “courses” Type of existing surface
WSDOT Chip Seal Program
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Chip Seal Systems
System Selection Cationic Rapid Set… Single Size & Uniform Asphalt Cement…. Single Size, Dry & Pre-Coated High Float…. Dense graded, Crushed Cover Stone Cutbacks… Dense graded, Crushed Cover Stone
WSDOT Chip Seal Program
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Past Use of Chip SealsBituminous Macadam Construction Gravel Road Conversion New Construction Cushion Course
WSDOT Chip Seal Program
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Past Use of Chip SealsSeal Coats Capital Projects Maintenance
WSDOT Chip Seal Program
Major change from current philosophy….
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Past use of Chip SealsCompatible Materials
Asphalt Emulsion Aggregate
WSDOT Chip Seal Program
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Past Chip Seal Practice
WSDOT Chip Seal Program
Chip Seal System Selection
Many failures occurred with the various chip seal systems used.This attributed to poor public opinion.
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Past Use of Chip Seals
WSDOT Chip Seal Program
Collaboration with Industry
WSDOT, Contractors, Suppliers and other Local Agencies.
Beginning in 2006, meetings were held which included:
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Chip Seal ConstructionSpecification Changes
Standardization of Aggregate Size Inclusion of Choke Stone Use of Steel Wheel Rollers Measure and Pay for Aggregates by S.Y. Maximum Surface Temperature of
130°F
WSDOT Chip Seal Program
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Current Preservation Policy
Bituminous Surface Treatments (BST’s)
WSDOT has began using an integrated approach to our preservation treatments.
Crack Seal Chip Seal Fog Seal
WSDOT Chip Seal Program
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Chip Seal Design
WSDOT Chip Seal Program
Chip Seal System Selection Rural Urban Snow Zones Traffic Volumes
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Current Chip Seal PracticesCRS2-P, Cationic Rapid Set w/ Polymer Racked-in-Seal 3/8 - #4 course aggregate Coverstone 0 - #4 Choke Stone Fog Seal 3-5 days after placement High Traffic Levels (up to 30,000 ADT)
WSDOT Chip Seal Program
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Current Chip Seal Practices
High Float Emulsion, HFE-150 Lower Cost Slow cure time High fugitive dust Low volume routes
WSDOT Chip Seal Program
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Current Chip Seal PracticesAC15-P, Asphalt Cement w/Polymers High traffic volume Low fugitive dust Quick set time Striping same day
WSDOT Chip Seal Program
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Current Chip Seal PracticesMountain Passes
WSDOT Chip Seal Program
Mountain Passes are challenging for a chip seal to be successful.
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Current Chip Seal Practices
WSDOT Chip Seal Program
Mobilization of crews and equipment can be challenging anda costly venture.
Mountain Passes
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Current Chip Seal Practices
Mountain Passes
WSDOT Chip Seal Program
A larger aggregate structure will produce a more tenacious wearing course to mitigate these obstacles.
Snow Plow Damage
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Current Chip Seal PracticesMountain Passes
For routes with steep grades and super elevated curves, WSDOT has incorporated 24 hour piloted traffic.
WSDOT Chip Seal Program
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Current Chip Seal Practices
Mountain Passes CRS2-P, Cationic Rapid Set 1/2” – 1/4” Coverstone Choke Stone Fog Seal
WSDOT Chip Seal Program
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Current Chip Seal PracticesMajor Arterial Intersections
HMA Overlay Choke Stone Cape Seal
WSDOT Chip Seal Program
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Future Chip Seal PracticesCape Seal
Intersections Bike Routes
2015 Trial project SR 207
WSDOT Chip Seal Program
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Future Use of Chip SealsHot-Applied Chip Seal Systems
Asphalt Cement AC-15P CRM blend
WSDOT Chip Seal Program
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Future Use of Chip Seals2014 Trial Project
WSDOT Chip Seal Program
State Route 97A,in the central part of Washington State was chosen to construct WSDOT’s first Asphalt Cement chip seal.
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Future Use of Chip SealsAC-15P HBST Chip Seal System 3/8”- #8 Aggregate Pre-Coat Aggregate PG 64-22 Stockpile (Dry) Apply (Cold)
WSDOT Chip Seal Program
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Future Use of Chip Seals
Mountain Passes AC-15P HBST 3/8” – #4” Coverstone Choke Stone… Fog Seal…
WSDOT Chip Seal Program
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Future Use of Chip SealsCRM HBST Chip Seal System
3/8”- #4 Aggregate
Pre-Coat Aggregate PG 64-22 Apply (Hot)
WSDOT Chip Seal Program
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Future Use of Chip SealsCRM HBST Chip Seal System
WSDOT Chip Seal Program
In 2015, Chelan County employed the use of Crumb Rubber Modified (CRM) chip seal.
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Future Use of Chip Seals
WSDOT Chip Seal Program
Options… (Prices may vary depending on factors applied)
CRS-2P BST Chip Seal $1.50/SY AC15-P HBST Chip Seal $2.00/SY CRM HBST Chip Seal $4.00/SY HMA Thin Lift Overlay $10.00/SY
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Future Use of Chip Seals
WSDOT Chip Seal Program
Racked-in-Seal…..To Choke or not to Choke
Asphalt Emulsion Chip Seals…
Asphalt Cement Chip Seals…
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Future Use of Chip Seals
WSDOT Chip Seal Program
Fog Seal…. newly constructed Chip Seal
Asphalt Emulsion Chip Seals…
Asphalt Cement Chip Seals…
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Summary
WSDOT Chip Seal Program
Using the Right Tool
Asphalt Emulsion BST HF-150
Asphalt Cement HBST AC-15P
Asphalt Emulsion BST CRS-2P