Virginia Pavement Research and Innovation Symposium ...Innovation Symposium ADVANCED MIX DESIGN...
Transcript of Virginia Pavement Research and Innovation Symposium ...Innovation Symposium ADVANCED MIX DESIGN...
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Virginia Pavement Research and Innovation Symposium
ADVANCED MIX DESIGN SERVICES
By
Scott Quire, P.E.
Bluegrass Testing Laboratory
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Bluegrass Testing Laboratory ??????
• Who we are:• A subsidiary of Louisville Paving Company
• An AASHTO Accredditted lab facility located in Louisville, KY
• We are in compliance with ASTM D3666 and provide asphalt mix design testing for FAA projects across the United States
• At present we provide asphalt mix design and construction materials testing services in eleven states
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HIGHWAY PAVEMENTS
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Airfield Pavements
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RACE TRACKS and ROAD COURSES
Miller Motor Sports Park, Toole, UT Kern Co. Speedway, Bakersfield, CA
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Pavement Mixtures for Bridge Decks
I-65, Lincoln Bridge
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Asphalt Mixture Design
• Types of Hot Mix Asphalt Mix Designs Performed:• Superpave Volumetric Mix Designs
• Dense Graded Designs
• SMA
• OGFC
• 4 inch Marshall Mix Designs (some states/FAA)• Static Base
• Rotating Base
• Manual
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Asphalt Mixture Testing• Moisture Damage Susceptibility Testing
• AASHTO T283
• ASTM D4867
• ASTM D1075 (Idaho)
• AHTD 455 (Arkansas)
• AASHTO T324 (Hamburg Loaded Wheel Testing)• Stripping Inflection Point
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Asphalt Mix Designs• Types of Asphalt Mix Designs Performed:
• Hot Mix Asphalt
• Warm Mix Asphalt (Foamed Asphalt and/or Chemical)
• Additive evaluations (Mix and Binder)
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AGGREGATE TESTING
• Aggregate Testing:• Aggregate Specific Gravity and Absorption
• Sand Equivalent
• Flat and elongated
• % Lightweight
• LA Abrasion Loss
• Micro-Deval
• Aggregate Soundness Loss (Sodium and Magnesium Sulfate Soundness)
• Plastic Limits
• Proctor/Modified Proctor
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Asphalt Mix TESTING• Pavement Analysis
• Forensic investigations of UNDER PERFORMING pavements• Failure is a word to use cautiously
• Typical investigation involving:• Site visit to map out what needs to be accomplished to develop a picture of what has/is
happening
• Testing accomplished to secure the support test data
• Drone over flight from multiple perspectives to record any visual problems if needed
• Report and then defense of position of position as needed
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Asphalt Binder Testing
• Asphalt binder testing• AASHTO M320 Performance Graded Binder Spec.
• AASHTO M332 Multiple Stress Creep Recovery Binder spec.
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Asphalt Mix Design• Development of Alternative Mix Design Gradings
• To develop a mix design grading that will address project specific needs• Mixture type needed to address heavy loading (1.5 inch base, 0.75 inch surface)
• Mixture type to address needed speed of construction and still address:• Durability (compaction, permeability, adequate structure for loading conditions)
0.75 inch Surface 0.75 inch Surface w/HEAVY TRUCKS- 18 years Old
0.75 inch Surface on FedEx Distribution Center Parking Lot
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PLANT WASTE ROADWAY MILLINGS
TEAR OFF SHINGLES
WASTE MANUFACTURER SHINGLESRECYCLE MATERIALS
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PROCESSED RAP
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PROCESSEDSHINGLES
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Asphalt Mixture Design
• Recycle Mix Designs• Most every state DOT has specification limits on how much and type of
recycle [unprocessed RAP, Coarse RAP, Fine RAP, RAS (manufacturer waste, post consumer waste)] that is allowed.
• When agencies/mix producers have large quantities of recycle material :• Can the recycle %’s be increased safely?
• Can it be proved?
• Some agencies/owners allow the opportunity for higher recycle %’s if you can:• Prove what is being proposed is a safe/responsible use
• Relevant specification limits (most typically low temperature binder grade) are not violated
• A Balanced Mix Design approach is adhered to
• Cracking test ( to see if the proposed product(s) adequately address cracking susceptibility)
• Loaded wheel testing (to see if the proposed product(s) increase the potential for rutting
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Asphalt Mix Testing Services• Testing Serivces
• Indiana DOT Acceptance Testing Services Contract• 2500-3000 samples per year
• 4 year contract
• Daily sample pickup (532 miles roundtrip daily)
• All samples come from paving site plate samples
• Ignition oven rejected and ACCEPTANCE % AC by Trichlor Solvent Extraction
• Combined Aggregate bulk specific gravity verified during production using extracted mineral aggregate from paving site plate samples
• To date:• Some days 40 + solvent extractions (trichloroethylene)
• Some days 60 + aggregate gradations
• Supplemental dryback procedures for most maximum specific gravity samples due to absorptive aggregate
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THANK YOU!