Updates on Mechanistic Empirical Pavement Design Guide MEPDG
Concrete Pavement Construction the Facts - FTBA · 2013-01-09 · Mechanistic Empirical Pavement...
Transcript of Concrete Pavement Construction the Facts - FTBA · 2013-01-09 · Mechanistic Empirical Pavement...
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2010 FDOT Construction Conference
Concrete Pavement
2010 FDOT Construction Conference
Concrete Pavement Construction – Just the Facts
Jamshid Armaghani Ph D PEJamshid Armaghani, Ph.D., P.E.
Florida Concrete and products Association
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Concrete Pavements of TodayDesign –
Optimum and structurally soundEconomicalEconomical
Construction –Almost 100% automation F t d d i i l lFast and paved in a single layerSmooth Quiet
Quality –Innovative testing equipment to assure structural and functional qualityfunctional quality
Materials –Cement ‐ Locally produced i h h i d h bHigh strength concrete – New construction and Rehab
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AASHTO Pavement Design GuideAASHTO Pavement Design Guide
• Empirical methodology based on AASHO Road Test in the late 1950’s
• Several versions:– 1961, 1972, 1986, 1993 (Empirical)M li i i– Many, many limitations
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AASHO Road Test (late 1950’s)
(AASHO, 1961)
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Limitations: Huge Traffic Extrapolation
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Mechanistic Empirical Pavement Design Guide ( )(MEPDG)
State‐Of‐The‐Art Guide based on fundamental pavement engineeringpavement engineering principles, climatic conditions, traffic volumes & material characteristics. It has been calibrated using over 250 pavement sites pthroughout the country.
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Climate
MEPDG
Traffic
Structure,Joints,
Traffic
DG Inputs Axle load (lb)
Materials & ConstructionReinforcement
DG Process
DG Outputs
stress
age Field Distress
8Damage
Dis
Distress Prediction & ReliabilityMechanistic Response
Damage AccumulationTime
Dam
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MEPDG Design Optimization OptionsMEPDG Design Optimization Options Widened lanesSh t J i t iShort Joint spacing Larger size dowelsHi h i hHigher compressive strength Advantage of structural value of support layerslayersBond at Concrete‐asphalt base interfaceFl id Li t ith l C ffi i t fFlorida Limestone with low Coefficient of Thermal Expansion.
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MEPDG Output king
% Crack
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Slipform machine (2)
Curing/tining machine (3) Concrete Spreader (1)
Paving TrainPaving Train
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Alignment Sensor
Elevation Sensor
Stringline
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Leica System EquipmentLeica System Equipment
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Computer on PaverComputer on Paver
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Adjustable Telescopic Frame
Spreader arm
Tie bars basket Dowel bars basket
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On‐site Batch Plant
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Concrete mixes can be designed to allow opening lane to traffic from 6 hrs to 36 hours
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Maturity Meter
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Tie bars away from the Joint and ends of dowel bars
Nail dowel basket to AC baseto AC base
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Transverse Tiningg
Wide tine spacing can be Noisy Narrow tine spacing (1/2”) produces quieter surface
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Longitudinal Tines Produce quiet pavement q p
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Grinding
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Smoothness TestingSmoothness Testing
California Profilograph
Laser Profiler
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Narrow Joints produce quiet pavement
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Uncontrolled crack from delayed joint sawing
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Narrow vs. Wide Joints
Narrow joints produce quieter pavement Joints > ½” Generate Noise
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Joint too wide. Will cause noise.Must be ≤ ¼ “
Replacement slab
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Pervious Concrete Edge Drain
Filter Fabric
Asphalt subbase
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Graded aggregate gg gdrainage mat beneath curb.
Asphalt baseAsphalt base
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