Transcript Document

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
Reflection: Evolution of the Deterioration
PSI
5
4
3
2
1
Quality of the Road
Number of Years
Rehabilition of Concrete Pavement
PSI
5
4
3
2
1
Quality of the Road
Number of Years
Rehabilition of Concrete Pavement
Rubblizing
Rehabilition of Concrete Pavement
Rubblizing
Rehabilition of Concrete Pavement
Rubblizing
Structural Design: Correlations
100
Probability of Failure
Structural Failure
1 to 8”
Reflective Cracking
Target Zone
0
Low
Small
PCC Modulus
Nominal Fragment Size
High
Large
DESCRIPTION OF
TECHNICAL RUBBLIZING
Description of Rubblizing Equipment
Weight
Computer Controls
Resonant
Beam
Pedestal / Shoe
Flotation Tires
Motor
Description of Resonant Beam
Vibration Technology
Weight
Frequency 44 Hz
Amplitude 1.905 cm
Description of Resonant Beam
Vibration Technology
Weight
Frequency 44 Hz
Amplitude 1.905 cm
Description of Resonant Beam
Vibration Technology
Weight
Frequency 44 Hz
Amplitude 1.905 cm
Operational Data of Equipment
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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
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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:
Alabama
Long life for surfaces – 22+ years
Smooth driving conditions
Rubblization eliminates reflective
cracking and dramatically reduces surface
defects
Michigan
Structural Design: Evaluation
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Pictured is pavement after
years of use and
deterioration.
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Expert analysis is required to
determine the cause of the
failure of the pavement.
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If the damage does not arise
from the Subgrade or
SubBase, the pavement is a
candidate for Rubblization.
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If there is a problem with the
Subgrade, Rubblization will
not eliminate the issue.
Structural Design: Drainage
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A Proper Drainage System should
be Installed or Repaired prior to
Rubblizing the pavement.
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Varying Methods of Drainage can
be used depending on the Site.
Structural Design: Drainage
Relief Cut @ 9-12 m.
Shoulder Area
Permeable Zone
5 cm dense-graded
10 cm open-graded
Rubblized PCC
Base
Course
Filter Fabric
# 57 Stone
3 % Slope Outlet
Subgrade
Structural Design: Scope
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.
E4 > E3
E3 > E2
Where
E3 = f(E2)
Subbase
E2 > E1
Where
E2 = f(E1)
Subgrade
E1
Structural Design: Coorelations
Coefficient Structure (ai) vs. Modulus (Mr) AASHTO
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
Rolling
 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
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