Concrete Pavement Concrete Pavement  Construction – Just the Facts  Jamshid Armaghani Ph D P E

2010 FDOT Construction Conference
2010 FDOT Construction Conference Concrete Pavement Concrete
Pavement
Construction – Just the Facts Jamshid Armaghani, Ph.D., P.E. Jamshid
Armaghani Ph D P E
Florida Concrete and products Association Concrete Pavements of Today
™ Design –
¾ Optimum and structurally sound
¾ Economical
™ Construction –
¾
¾
¾
¾
Almost 100% automation F t d
Fast and paved in a single layer
di
i l l
Smooth Quiet
™ Quality –
¾ Innovative testing equipment to assure structural and functional quality
functional quality ™ Materials –
¾ Cement ‐ Locally produced ¾ High strength concrete –
i h
h
New construction and Rehab
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AASHTO Pavement Design Guide
AASHTO Pavement Design Guide
• Empirical methodology based on AASHO Road Test in the late 1950’s
• Several versions:
– 1961, 1972, 1986, 1993 (Empirical)
– Many, many limitations
M
li i i
AASHO Road Test (late 1950’s)
(AASHO, 1961)
Limitations: Huge Traffic Extrapolation
Mechanistic Empirical Pavement Design Guide (
(MEPDG)
)
‰ State‐Of‐The‐Art Guide based on fundamental pavement engineering
pavement engineering principles, climatic conditions, traffic volumes & material characteristics. It has been calibrated using over 250 pavement sites p
throughout the country. MEPDG
Climate
Traffic
Structure,Joints,
Reinforcement
Materials & Construction
DG Inputs
Axle load (lb)
DG Outputs
Mechanistic Response
Time
Damage Accumulation
Field Distress
Disstress
Damage
DG Process
Damage
Distress Prediction & Reliability
8
MEPDG Design Optimization Options
MEPDG Design Optimization Options ™
™
™
™
™
Widened lanes
Sh t J i t
Short Joint spacing i
Larger size dowels
Hi h
Higher compressive strength i
h
Advantage of structural value of support layers
™ Bond at Concrete‐asphalt base interface
™ Florida Limestone with low Coefficient of Fl id Li
t
ith l C ffi i t f
Thermal Expansion.
% Crackking MEPDG Output Slipform machine (2) Concrete Spreader (1)
Curing/tining machine (3) Paving Train
Paving Train
Alignment Sensor
Elevation Sensor Stringline
Leica System Equipment
Leica System Equipment
Computer on Paver
Computer on Paver
Adjustable Telescopic Frame
Spreader arm
Tie bars basket
Dowel bars basket
On‐site Batch Plant Concrete mixes can be designed to allow opening lane to traffic from 6 hrs to 36 hours
Maturity Meter Tie bars away from the Joint and ends of dowel bars Nail dowel basket to AC base
to AC base
Transverse Tiningg
Wide tine spacing can be Noisy
Narrow tine spacing (1/2”) produces quieter surface Longitudinal Tines Produce q
quiet pavement p
Grinding
Smoothness Testing
Smoothness Testing California Profilograph
Laser Profiler
Narrow Joints produce quiet pavement Uncontrolled crack from delayed joint sawing Narrow vs. Wide Joints
Narrow joints produce quieter pavement
Joints > ½” Generate Noise Replacement slab
Joint too wide. Will cause noise.
Must be ≤ ¼ “
Pervious Concrete Edge Drain
Filter Fabric
Asphalt subbase
Graded aggregate
gg g
drainage mat beneath
curb.
Asphalt base