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Concrete Pavement:
Jerry L. Larson
IRMCA
Indiana LTAP
Basics of a Good Road
Select ion o f Concrete
Materials
INDIANA CHAPTER
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Longitudinal joint
Transverse joint
Subgrade
Base
Surface Texture
Surface smoothness
or rideabilityThickness Design
Dowel bars
Concrete materials
Tiebars
Basic Components of a
Concrete Pavement
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Flexible Pavement
How Pavements Carry Loads
6600 LBS.6600 LBS.
pressure < 0.2 MPa
pressure
2.0 MPa
Concretes rigid panels spread the load over a large area
reducing pressure on the sub grade.
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Conventional Concrete Pavement Types
Full Depth
New Construction Reconstruction
Overlays
Thin Overlays
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Concrete Design Optimize
Cost
Performance
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Subbase vs. NO Subbase
Heavy Traffic?? > 120 Trucks/day =
subbase
Fine grain soils prone to erosion
Presence of moisture/water
Potential pumping
Presence of all or most above conditions
suggests need for subbase
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Successful Concrete Pavement
Design Requires Selecting
Appropriate Features
Subgrade modification
Drainage system
Subbase Joint Spacing
18 ft
15 ft
Dowels
Thickness 8 in
10 in
12 in
Reinforcement
Joint Sealant
None Hot pour
Silicone
Preformed
Surface Texture
Transverse tine Burlap drag
Shoulder
Asphalt
Concrete
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Material
Cement (Type I)Cement (Type III)
Fly AshCoarse AggregateFine Aggregate
Water:Cement RatioWater ReducerAir Entrainer
564 lbs.
1750 lbs.1250 lbs.
yesyes
708 lbs.(658 lbs.)(50 lbs.)1425 lbs.1350 lbs.
0.42yesyes
0.45 max.
(per cubic yard)
INDOTClass A
INDOTClass CFast Track
Maximum top size coarse aggregate 0.75 - 1.0 in.
Air content 6% + 1.5%
*
**
***
Concrete Mix Design
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Durability = Performance
Quality Materials
AggregateAP Approved, uniform
gradation
Minimum Cement Content
Approved Admixtures
Proper Mix DesignControl to Design
Moisture/Water ControlAir Entrainment6% + 1.5%
Proper CuringLiquid membrane applied @
manufacturers suggested rate
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Panel Design
1220 FT
Plan
Profile
or
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Jointing
Spacing based on thickness 6 thick 12 joint spacing
> 12 thick 18 joint spacing
> 12 thick - saw 1/3 the depthIf not specifying dowelscan skew
joints 1 in 12 across pavement
High volume trafficseal joints withsilicone or neoprene
Low volume trafficseal joints with hotpour rubberized asphalt
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Dowels or NO Dowels
The slabs ability toshare its load with itsneighboring slab Dowels
High Traffic Volumes
(Pavements > 8 in.)
Aggregate Interlock
Low Traffic Volumes(Pavements < 7 in.)
L= x
U= 0
Poor Load Transfer
Good Load TransferL= x U= x
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Surface Texture
Tineing
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Surface Texture
Light Broom
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Surface Texture
Drag Finish
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Construction - Reconstruction
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Construction - Reconstruction
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Overlays
Expected Performance
UTW (2 4) 15 to 20 years
Thicker overlays (4 6) 20 to 25 years
Condition of existing sub-grade/pavement
Clearance issuesif none, can build on
top of old PCCP or HMA pavement
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Concrete
Resurfacing Applications
Concrete overlays for concrete
pavements:
Bonded Concrete Overlays
Unbonded Concrete Overlays
Concrete overlays for asphalt pavements:
Conventional Whitetopping
Ultra-Thin Whitetopping
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Unbonded Overlays
Separation Interlayer:
Overlay
Old Pavement
Key
Overlay
OldPavement
Smooth Slip Plane
Interlayer (1 in)
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I-69 UNBONDED PCC OVERLAY
PCCP over old Concrete Pavement
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Conventional Whitetopping
Consists of thick concrete layer (4 in or greater) on topof an existing asphalt pavement.
Behaves as a new pavement on a strong base.
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Harding Street - Indianapolis
Built in 1985
6 Overlay on old HMA pavement
8 thick on stone where widened
Skewed Joints
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PCCP over old Chip & seal road
121stSt., Fishers
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Allisonville Road
PCCP over 2 lane HMA street
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Allisonville Road Cross Section
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UTW Schematic
Thin Slabs
(2 to 4 inches)Short Square Slabs
(2 to 6 ft.)
Milled Surface
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Demonstration in 2002
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Photo by Indiana Public Works.com Magazine
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Concrete Roads and Streets
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Concrete Intersections & Roundabouts
US 31 & SR 32
Gray Rd. & 96thSt.
US 6 & US 421
96
th
St. approachingKeystone Ave.
Pontiac Ave. & Wayne
Trace, Ft. Wayne
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Summary
KNOW YOUR OPTIONS
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Questions?
Contact:Jerry L. Larson
(317) 634-8989
jlarson@irmca.com
Indiana Ready Mixed Concrete Association
(317) 872-6302
www.irmca.com
INDIANA CHAPTER
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