Constructability Issues and · PDF fileConstructability Issues and Consequences Timothy R....
Transcript of Constructability Issues and · PDF fileConstructability Issues and Consequences Timothy R....
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ConstructabilityIssues and Consequences
Timothy R. Murphy, P.E.
OHIO ASPHALT PAVING CONFERENCE
WEDNESDAY, FEBRUARY 4, 2015
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aka The Post-Recession Depressionof AsphaltFROM 2008 UNTIL TODAY
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aka The Post-Recession Depressionof AsphaltFROM 2008 UNTIL TODAY
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Our Job is to Evaluate RiskRUGGED REVIEW OF PRACTICES WITHNUMEROUS NATIONAL EXPERTS WASCOMPLETED IN 2014 BY THE FEDERALHIGHWAY DISTRICTS.
ProcessControl
LCCA
Durability
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Our Job is to Evaluate Risk
FOCUS ON THE:
• TYPICAL PAVEMENT CROSS SECTION,
• ASPHALT MIX DESIGN AND PRODUCTS,
• PRODUCTION, AND
• CONSTRUCTION PRACTICES CURRENTLYIN PLACE.
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“”
Constructability defines theease and efficiency with whichstructures can be built.
- From Wikipedia, 2015
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Constructability (or buildability)
The term refers to the effective and timelyintegration of construction knowledge into theconceptual planning, design, construction, andfield operations of a project to achieve the overallproject objectives in the best possible time andaccuracy at the most cost-effective levels.
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Copyright 1954
Recommended reading forall junior level engineers
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Constructability (or buildability)
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Constructability (or buildability)
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Constructability (or buildability)
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Constructability (or buildability)
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Constructability (or buildability)
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Constructability (or buildability)
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Constructability (or buildability)
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Indiana Glass Bead Test (ITM 812)
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Constructability (or buildability)
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Constructability (or buildability)
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Constructability (or buildability)
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Has the surface been thoroughlycleaned and properly tacked?
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Constructability (or buildability)
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Constructability (or buildability)
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Constructability (or buildability)
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Constructability (or buildability)
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Principles of Constructability Mappedon to the Procurement Process
Integration
Construction knowledge
Team skills
Corporate objectives
Available resources
External factors
Programme
Construction methodology
Accessibility
Specifications
Construction innovation
Feedback
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Standard Specifications, currentEVER CHANGING edition
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Standard Specifications
Minimum VMA,
Optimum Air Voids,
Reasonable Gradation Bands,
Achievable Compaction Levels, and
Defendable Recycling Levels.
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Hot Mix Asphalt (HMA)
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Mix Design Submittal
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Is the plant producing the mix perthe design?
Design with minus #200 to:
Account for breakdown,
Predict field VMA, and
Ensure JMF target asphalt content is produced.
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Murphy’s Material Minute
Asphalt Mix Design:
Requires accurate, reliable, and consistentaggregate bulk (dry) specific gravities that mustbe run on processed products.
Watch the Gse from design through productionpaving. (Gse change = Gsb change)
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Volumetric’s 400
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Improve Mechanical Stability
Improve Resistance to Permanent Deformation
Reduce Moisture/Air Penetration
Improve Fatigue Resistance
Reduce Low-Temperature Cracking Potential
Importance of VMA
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Why do we care aboutcompaction?
Density,
Smoothness,
Strength.
Permeability,
Public,
Power.
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Reclaimed Asphalt Pavement
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Constructability (or buildability)
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VMA, dust to binder ratio, & AC
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Murphy’s Material Minute
Asphalt Production & Construction:
‘Use all equipment in accordance with themanufacturers recommendation.’
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Dust balls
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Fat Spots in Pavement
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Fat Spots in Pavement
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Fat Spots in Pavement
Issue
Top half AC = 6.1%
Bottom half AC = 4.8%
Solution: Eliminate steam build up in the MTV
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Constructability (or buildability)
A project management technique to reviewconstruction processes from start to finish duringpre-construction phase. It is to identify obstaclesbefore a project is actually built to reduce orprevent errors, delays, and cost overruns.
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Constructability (or buildability)
A project management technique to reviewconstruction processes from start to finish duringpre-construction phase. It is to identify obstaclesbefore a project is actually built to reduce orprevent errors, delays, and cost overruns.
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Quit living on the fringe
Improve production volumetric measurements.(If you can design it, then you can produce it)
Enhance gradation to be a smooth ‘S’ shapedcurve. (Reduce testing variability)
Understand that minimums are just that, they are notaverage minimums. (Improve the life of asphalt)
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QC – Mean & Spread Relationship
x
LSL LSL
xx“Typical” Sn
“Smaller” Sn
90 PWL90 PWL 75 PWL
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Questions?
t m u r p h y @ m u r p h y p a v e t e c h . c o m