s81 20jerry 20larson copy 20of 20larson 20 20selection 20of 20concrete 20materials

8/13/2019 s81 20Jerry 20Larson Copy 20of 20Larson 20 20Selection 20of 20Concrete 20Materials

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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

[email protected]

Indiana Ready Mixed Concrete Association

(317) 872-6302

www.irmca.com

INDIANA CHAPTER

s81 20jerry 20larson copy 20of 20larson 20 20selection 20of 20concrete 20materials

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