maryland asphalt association...maryland asphalt association maa—sha 55th annual paving conference...
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Industry, Agency, and UniversityPartnerships
Ahmet Aydilek, Charles W. Schwartz, and Dimitrios GouliasUniversity of Maryland
Marshall KlinefelterMaryland Asphalt Association
MAA—SHA 55th Annual Paving ConferenceMarch 1, 2017
MARYLAND ASPHALT ASSOCIATION
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Structural Design of Porous Asphalt Pavements
NAPA, IS‐131
Infiltration rate:0.1 to 10 in/hr
Drain Time:12 to 72 hr
Thickness:12 to 36 in
Thickness:4 to 8 in
High voids, high saturation levels in subgrade:Reduced bearing capacity?
High voids, large thickness of stone base:Effect(s) on structural capacity?
Partners: University of Maryland, National Asphalt Paving Association
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Asphalt Surface(15‐20% voids)Choker Course
Stone Recharge Bed40% voids
Geotextile Separator
UncompactedSubgrade
Defining traffic loads
Selecting structural layer coefficient (a1)
Estimating structural contribution:• Selecting structural layer coefficient (a2)• Determining ‘effective thickness’ • Selecting drainage coefficient (m2)
Estimating appropriate resilient modulus
Challenges: Empirical AASHTO 93 Design
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6” Asphalt Surface(a = 0.40)
Semi‐Infinite“Subgrade”
similar to
Stone Recharge Bed(MR = 20,000 psi)
(a = 0.10)
Total SN = 2.40
W18 = 2.3 MESAL
6” Asphalt Surface(a = 0.40)
Choker Course
Stone Recharge Bed
Geotextile Separator
UncompactedSubgrade
(MR = 4000 psi)
Total Base: 36”a = 0.10
Total SN = 6.00
W18 = 41.5 MESAL
vs
6” Asphalt Surface(a = 0.40)
Choker Course
Stone Recharge Bed
Geotextile Separator
UncompactedSubgrade
(MR = 4000 psi)
Total Structural Base: 17”a = 0.10
‘Excess’ Base: 19” (hydrologic only)
for W18 = 2.3 MESAL(over 4000 psi)
Total SN = 4.10
May becombinedinto“effective”subgradeMR
Modified Structural Section
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Layer Recommended Property Value Comments
Porous asphalt a1 = 0.40
ATPB a2 = 0.30 – 0.33
Coarse stone base (reservoir)
a2 = 0.07 – 0.10m2 = 1.0
Limit to effective structural thickness
Uncompacted subgrade
Soil Classvs
Modulus
Relationships
Reduce values by 25‐50% for lack of compaction and high moisture content.Incorporate excess stone base thickness into effective subgrade modulus.Use geosyntheticseparator layer between subgrade and coarse stone base.
Recommendations
End Result: Broader implementationof porous asphalt pavements!
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H/WMA Level 1 Properties for MEPDG
Intercept, A log (Number of load cycles)
log cumulative
axia
l plastic strain, %
Slope, B
Secondary stage
Primary stage
Tertiary stage
A
Partners: University of Maryland,MD State Highway Administration
Objective: Develop catalogof typical Level 1 propertiesfor common MD mixtures
Benefit: More effective use of W/HMA mixtures in pavement structural design
in Maryland!
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Foamed Asphalt Stabilized Base
MD 295 Outside BWI
Partners:• University of Maryland• MD State Highway Administration• P. Flanigan & Sons, Inc.• Global Resource Recyclers, Inc.
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FSB Structural Design Properties
Benefits:• More rational and effective use of foamed asphalt stabilized base materials in Maryland
• Utilization of excess RAP and RC stockpiles• More sustainable pavement solutions
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CIR/CCPR/FDR Level 1 Properties for MEPDG
Intercept, A log (Number of load cycles)
log cumulative
axia
l plastic strain, %
Slope, B
Secondary stage
Primary stage
Tertiary stage
A
Partners: University of Maryland,Virginia Transportation Research Council (VDOT),Wirtgen America, Colas Solutions, NCHRP
Objective: Develop catalogof typical Level 1 propertiesfor bituminously stabilizedcold recycled materials
Benefits: • More effective and widespread use of
asphalt stabilized cold recycled mixtures in pavement structural design
• Complements H/WMA structural wearingcourse
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Infrared Asphalt Repair
Partners: University of Maryland (CEE Dept, MIPS Program);Pavement Corporation
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Project Results:
• Improvements to patching process (e.g., heating process, rejuvenator application)
• Documentation of patch material quality (density, indirect tensile strength)
• Development of QA procedures
• Draft specification
Currently working with MD SHA to add to state specs.
Project QA Sheet
Benefits:
• Improvement/confirmation of infrared asphalt repair as a superior all‐weather maintenance strategy
• Economic development through increased revenues and numbers of employees
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Existing Dedicated Teaching Lab Space
UMD Infrastructure Lab Renovation
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Project Motivation: Program Needs• Laboratory experiences are a critical part of a civil and
environmental engineering curricula
• 100% of UMD CEE juniors (120+ students/year) take ENCE 300 Fundamentals of Engineering Materials
• 60% of UMD CEE seniors (75+ students/year) take ENCE 444 Experimental Methods in Geotechnical & Structural Engineering
• 10 – 20 students/year take ENCE 489 Special Problems in Civil Engineering
• With increasing enrollments, laboratory courses have become choke points in the curriculum
• Current lab facilities pose an accreditation risk
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Teaching(Materials, Soils)
Teaching(Structures)
Teaching(Specimen Prep)
Renovated Lab Layout and Design
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Current Status
Design/Construction under campus Facilities ManagementConstruction Documents 75+% completeConstruction Start: June 2017Occupancy: Spring 2018 (partial), Fall 2018 (full)
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Fundraising Whiting‐Turner Contracting $1500K
Scott Greenhaus ‘82, ‘86 $50K
Maryland Asphalt Association $50K
Maryland Chapter ACI $25K
Whitman, Requardt Associates $25K
Joe Makar ‘78 $25K
Gutschick, Little and Weber $25K
Wallace Montgomery $25K
Whitney, Bailey, Cox and Magnani $25K
KCI $25K
Chamberlain Contracting $15K
VIKA $10K
GeoConcepts $10K
Mercado $10K
Forrester Construction $10K
Johnson, Mirmiran, Thompson $5K
TOTAL TO DATE $1835K
Benefit: A state‐of‐the‐art facility for trainingour next generations of engineers and construction leaders.
A special “thank you” to the Maryland Asphalt Association for its most generous contribution!
We are still actively fundraising and wouldLike to talk to many you in the near future…
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Risk & Pay Factor Analysis for HMA
• Project Objectives:• Estimating risks of accepting lower quality (agency risk) or rejecting high quality (contractor risk) HMA
• Relating risks of acceptance to HMA pay factors
• Partners:• University of Maryland• MD State Highway Administration• The many contractors who provided QA/QC data to the MD SHA database
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Pay Factor Based on Predicted Performance
Benefit: More rational and equitable distribution of risk between agency
and contractor
Predicted Life Difference (years)
Pay Factor vs. Predicted Life Difference Based on Rutting
Paym
ent A
mou
nt (%
of O
riginal)
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Hydraulic/Environmental Properties of RAP in Highway Shoulders
Objective: Evaluate heavy metal leaching from RAP
Methods:• Constant Head Permeability • Batch Water Leach Test• Column Leach Test• UMDSurf
Partners:• UMD• MD SHA
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Concentration vs. Distance
Benefits:
• Documentation of environmentally benign use ofRAP in highway shoulders
• Increased use of RAP stockpiles
• Enhance sustainability of pavement solutions
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ASPHALT MIXES
Open Graded
• Stable Mixes• Waste Water Treatment Facilities• PATB ‐ Permeable Asphalt Treated Base• Porous Pavements
• Stormwater Management System• OGFC
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ASPHALT MIXES
Gap Graded
• SMA – Stone Matrix Asphalt
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ASPHALT MIXES
Dense Graded• Cart Paths• Driveways• Minor Roadways• Major Roadways• Race Tracks• Fish Rearing Ponds• Reservoirs• Airports
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WE HAVE COME A LONG WAY
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Contact Info:
Ahmet [email protected]
Charles W. [email protected]
Dimitrios [email protected]
Marshall [email protected]
MARYLAND ASPHALT ASSOCIATION