BONDED CONCRETE OVERLAYS

CRT CONCRETE CONSULTING, LLC?

BACKGROUND OF TULL• BS in Civil Engineering from Cornell University• Industry Experience:

Concrete Contractor (3 years)

Construction Manager (3 years)

Ready Mix Concrete (17 years)

• ACI Member– 330 Parking Lots– 302 Slab Construction– 332 Residential Concrete– 327 Roller Compacted Concrete– 522 Pervious Concrete

• Registered Professional Engineer in Indiana and Ohio• LEED AP

Concrete Overlays

www.cptechcenter.org

System of Concrete OverlaysConcrete Overlays

Bonded

Concrete

Overlay of

Concrete

Pavements

Bonded

Concrete

Overlay of

Asphalt

Pavements

Bonded

Concrete

Overlay of

Composite

Pavements

Bonded Overlay System

Unbonded

Concrete

Overlay of

Concrete

Pavements

Unbonded

Concrete

Overlay of

Asphalt

Pavements

Unbonded

Concrete

Overlay of

Composite

Pavements

Unbonded Overlay System

Thinner Thicker

Bond is integral to design Old pavement is base

SCIENCE of BONDED OVERLAY

• Concrete is good compression• Concrete is not as good in tension• Design theory:

– Maximize compression– Minimize tension

• Bond is the key!

THE BOND

The “Duck” Tape Test• This is not rocket science• It is simple• It works…

– If you hear it– It pulls up with a moderate

amount of resistance

Short JointsReduce Stresses

2’ 2’2’6’

New Tools for New Problems

EverFE

EXPWide Load Setup

EXPUnbonded Wide Cold

301 PSI

EXPBB Cold Load Setup

EXPBB Unbonded Cold

Mechanics ofComposite Section

Unbonded

Neutral Axis

PCC

Bit.

Bonded

PCC

Bit.

ACPA APP Library

• http://apps.acpa.org/applibrary/

http://apps.acpa.org/applibrary/

Bremen Highway Overlay

4” PCCP Inlay over milled HMA Built:

2007

Bonded Overlay

19

Asphalt Had Deteriorated

Mill Out Asphalt

Placed Concrete

Little Finishing

Sawcut

Excellent Results

Concrete Support!

Stone Terminal

OOPS!

• Only 8” thick…

THERE HAS BEEN SUCCESS!