CIR & FDR “Great Roads Start from the Base Up!!”

Working Together to Promote Education and Advanced Technology

Moving Forward with Advanced Technology

• Sometimes we need to leave what we have done and used in the past behind for a better TOMORROW.

WHY ARE WE HERE??? • To Make Roads Stronger, Last Longer and be more

Sustainable for Future Generations. CIR and FDR is a •“…. safe, efficient, cost effective, environmentally friendly pavement reconstruction meeting the needs of present-day users without compromising those of future generations”

1.Optimizing the use of natural resources

2.Reducing energy consumption

3.Reducing greenhouse gas emissions

4.Limiting pollution

5.Improving health, safety and risk prevention

6.Ensuring a high level of user / owner comfort and safety

“Great Roads Start from the Base Up!!”

• Build from the Bottom Up. A road that has a poor base and poor drainage cannot be adequately improved with a top dressing of new pavement.

• Build for Traffic Loads and Traffic Volumes. It takes the passage of approximately 9,600 cars to equal the effect on a road of the passage of one 80,000-pound truck.

• Build on a Firm Foundation. A highway wears out from the top but it falls apart from the bottom. This is another way of saying that the road base determines the service life of a road.

• Get Water Away from the Road. Drainage cannot be emphasized enough in road construction and maintenance. Water affects the entire serviceability of a road. Too much water in the base materials weakens the road.

CIR and FDR • FDOT DEV 332 FDR Specification

• FHWA Recycling Publication Number: FHWA-SA-98-042

• FAA and DOD P-210 Specification

Effective Pavement Management: “Right Road, Right Treatment, Right Time”

How Roads with BASE problems were fixed in the past. Add more HMA. $$$$$

6 Year Old Mill & Resurface A Very Expensive Band-Aid

Granular Bases are not holding up!

• Current traffic loads • Increased rainfall • Higher water tables • Loose their SN over time

Granular Bases are not holding up!

• Current traffic loads • Increased rainfall • Higher water tables • Loose their SN over time

Granular Bases are not holding up!

• Current traffic loads • Increased rainfall • Higher water tables • Loose their SN over time

Granular Bases are not holding up!

Falling Weight Deflectometer (FWD)

§ Total Pavement Performance

§ Condition of Upper Pavement Layers

§ Indication of Soil Stiffness

Falling Weight Deflectometer (FWD) of Verna Rd

• Total SNi of Base Lost over time was from 0.18 to a 0.11

What’s the most cost effective FIX???

• Report was done on June 29, 2012 • Average core data: 2.75 in of HMA and 7.75 in of

limerock, shell base with 12” subbase. • SNi of existing asphalt layer 0.25 • Verna Rd average SN of 2.0 with the 12” subbase in

that figure.

Cold In-Place Recycling

and Full Depth Reclamation

Flexible Stabilized Base

Definitions - CIR Cold In-Place Recycling: The recycling of a deteriorated asphalt pavement & base material that has reached the end of its useful life. This includes asphalt wearing and base course material. Typical depths are 4 to 8 inches. The CIR machine cuts and sizes the old asphalt & base. The material is then mixed in-place with a new asphalt binder and other additives, paver-laid and compacted to the desired depth and scope of the project specifications, resulting in a flexible stabilized base course.

Cold In-Place Recycling Benefits

§ 50% less $ than remove & replace.

§ Minimizes disruption to public.

§ Reuses existing materials.

§ Removes cracking network.

§ Adds significant structural integrity.

§ Cost effective widening strategy.

What does a CIR or FDR candidate look like?

• Transverse and Longitudinal cracking

• Alligator cracking • Oxidized, raveled pavement • Some structural deficiencies • UGLY!!!

The CIR Process • Core the roadway and perform a mix design • Any widening/curb milling should take place prior to CIR • The CIR train pulverizes, mixes and paver lays the new flexible stabilized base course to the desired

cross-slope • Compact with a 10-12 ton steel wheel roller and a 27 ton rubber tire roller • Place the HMA surface course

Cold In-Place Recycling is perfect for urban and residential areas…

Definitions - FDR èFull Depth Reclamation: is a pavement rehabilitation technique in which the full flexible pavement section and a predetermined portion of the underlying materials are uniformly crushed, pulverized or blended. Additives are then introduced per the mix design, resulting in a flexible stabilized base course (FSBC) of 6 to 12 inches. (Including red brick and asphaltic block.)

Full Depth Reclamation

Full Depth Reclamation Benefits

§ Half the cost of remove & replace.

§ Simplifies road widening projects.

§ Reuses existing materials.

§ Removes entire cracking network.

§ Adds significant structural integrity.

§ Saves taxpayer dollars.

FDR is a slower and deeper process involving different equipment and additives

1.) Pulverize the existing pavement and underlying layers 2.) Pre-shape and compact the pulverized material

3.) Apply and mix stabilizing additives (2nd Pass)

4.) Fine grade and compact the stabilized material

5.) Fog seal or prime the SBC, as required

6.) Apply specified surface treatment

The FDR Process

How do we determine which method to use?

• By analyzing the survey • Coring the roadway • Perform soil testing • Interpret all of the data • Certified mix design

CIR & FDR construction process

CIR & FDR remove the cracking network

Granular vs. Stabilized Base

Reduced Moisture Susceptibility High water table

Unstabilized Granular Base Stabilized Base

Eliminates Rutting Below Surface

Rutting can occur in surface, base and subgrade of unstabilized bases due to repeated wheel loading

Stabilized bases resist consolidation and movement, thus virtually eliminating rutting in all layers but the asphalt surface.

Unstabilized Base Stabilized

Base

Spreads Loads

Unstabilized Granular Base Stabilized Base

100 psi

15 psi

100 psi

4 psi

CIR & FDR Flexible Stabilized Base Course Benefits

SN of Stabilized Flexible Base Structural Numbers greatly exceed those of

Granular Base

Question & Answer Session

All Roads to the Future are in OUR Hands!!