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Nov 26, 2013 (3 years and 8 months ago)

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PAVEMENT REHABILITATION


RESONANT RUBBLIZING


What is Rubblizing?



The Process of Fracturing Pavement of Portland Cement
Concrete into Angular Pieces for Direct Overlay

Application of Recycling

the Concrete Pavement (Rubblizing)

Environmentally Friendly


Construction

5

1

4

3

2

PSI

Number of Years

Reflection: Evolution of the Deterioration

Quality of the Road

5

1

4

3

2

PSI

Number of Years

Quality of the Road

Rehabilition of Concrete Pavement

Rubblizing

Rehabilition of Concrete Pavement

Rubblizing

Rehabilition of Concrete Pavement

Rubblizing

Rehabilition of Concrete Pavement

Structural Design: Correlations


Structural Failure
Reflective Cracking
100
0
Probability
of Failure
Low PCC Modulus
High
Small Nominal Fragment Size
Large
Target Zone
1 to 8”


DESCRIPTION OF
TECHNICAL RUBBLIZING


Description of Rubblizing Equipment

Pedestal / Shoe

Resonant
Beam

Weight

Flotation Tires

Motor

Computer Controls

Description of Resonant Beam

Frequency 44 Hz

Amplitude 1.905 cm

Vibration Technology

Weight

Vibration Technology


Weight

Frequency 44 Hz

Amplitude 1.905 cm

Description of Resonant Beam

Frequency 44 Hz

Amplitude 1.905 cm

Vibration Technology


Weight

Description of Resonant Beam

Operational Data of Equipment


Strikes PCC 44 Times per Second.


2,000 lbs. of Pressure Per Strike.


Beam Weighs 4080 kg.


Beam Raises 1.905 cm Per Strike.


Machine Speed at Approx. 6
-
8 km/hr.


Breaking Area is around 25 cm wide.


Maximum of 4,000 to 5,000 square
meters of rubblized concrete per day
with a crew of two Resonant Machines.


STRUCTURAL DESIGN


Structural Design: Methods



AASHTO



Procedure Design (SN)



Asphalt Institute


Series Manuals (MS)
-
17



NAPA


Series Information (IS)

117



Airfield Asphalt Pavement Technology Program
-

AAPTP

Structural Design: State Studies

Over 20 Studies from Multiple States
support that rubblizing provides:


Long life for surfaces


22+ years


Smooth driving conditions


Rubblization eliminates reflective
cracking and dramatically reduces surface
defects

Alabama

Michigan


Pictured is pavement after
years of use and
deterioration.



Expert analysis is required to
determine the cause of the
failure of the pavement.


If the damage does not arise
from the Subgrade or
SubBase, the pavement is a
candidate for Rubblization.




If there is a problem with the
Subgrade, Rubblization will
not eliminate the issue.

Structural Design: Evaluation

Structural Design: Drainage


A Proper Drainage System should
be Installed or Repaired prior to
Rubblizing the pavement.



Varying Methods of Drainage can
be used depending on the Site.

Structural Design: Drainage

10 cm open
-
graded

5 cm dense
-
graded

# 57 Stone

3 %

Slope

Outlet


Filter Fabric

Shoulder Area


Rubblized PCC

Base
Course

Subgrade


Permeable Zone

Relief Cut @ 9
-
12 m.

The Modulus of the Rubblized
Concrete depends on the
Thickness, Subbase and
Subgrade. Typically Rubblized
Concrete is 2.5 Times Stronger
than any Granular Material.

E
1

E
3

> E
2

E
4

> E
3

Where

E
3

=
f
(E
2
)

Where

E
2

=
f
(E
1
)

E
2

> E
1

Subbase

Sub
grade

Structural Design: Scope


Coefficient Structure (a
i
) vs. Modulus (M
r
) AASHTO


Structural Design: Coorelations



CONSTRUCTION

PROCESS


Rubblizing Process

Three Stages of Construction:



Rubblizing



Rolling



Asphalt Overlay

Prior to Rubblizing Process


Repair or Replace the
Drainage System


Remove any Asphalt
Overlay Currently in
Place

Resonant Rubblizing


Breaking area between 15.24 and 30.48 cm Wide


Ideal Distance Per Run
-

One Kilometer/ One Lane Wide


Speed of Resonant Machine 6 to 8 km/hr


Test Pit

Confirm Specification and Debonding


Wright Patterson



10 Ton High Frequency, Low Amplitude Steel Drum Roller (3 Passes)



Only Equipment Necessary After Rubblization



Not Recommended to Drive on Prior to Asphalt Overlay

Rolling

Asphalt Layer


Leveling Course on First Lift with Ability to Open Traffic


No Primer Required on Rubblized Layer


Minimum of 12.7 cm of Asphalt Overlay


Next Day
-

Open Traffic

Recommended State Specification


High Frequency Low Amplitude Resonant Breaker


Resonant Breaker shall apply 2,000 lbs of pressure per strike at 44 hertz


Removal of any Existing Asphalt Overlay


Majority of the Particle Size Less than 15.24 centimeters


Maximum Particle Size of 20.32 centimeters


10 Ton High Frequency
-

Low Amplitude Vibratory Roller


3 Passes with Maximum Speed of 1.82 meters/second


Minimum of 80% Debonding of Existing Steel Reinforcement


No Traffic on Rubblized Slab Until First Lift is Placed


Minimum of 12.7 cm of Hot Mix Asphalt Overlay


Results


22 Year Road