1 Pavement Lifting & Soil Stabilization Control STABILIZATION AND LIFTING of PAVEMENT STRUCTURES with EXPANSIVE STRUCTURAL POLYMER Norberto Laureano Regional Representative New Mexico, West Texas And the City Of Houston URETEK USA
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Pavement Lifting & Soil Stabilization Control
STABILIZATION AND LIFTINGof
PAVEMENT STRUCTURESwith
EXPANSIVE STRUCTURAL POLYMER
Norberto Laureano Regional Representative New Mexico, West
TexasAnd the City Of Houston
URETEK USA
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AGENDA
• PROBLEMS URETEK CAN SOLVE• MATERIALS URETEK EMPLOYS• PROCESS URETEK UTILIZES• APPROACH TO OUR CLIENT’S NEEDS• QUALITY / IMPROVEMENT PROCESS• URETEK DOD PROJECTS / PHOTOS• SPECIFIC APPLICATIONS ON YOUR BASE• QUESTIONS / PATH FORWARD
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PROBLEMS
• Settled Pavement
• Runways, Taxiways, Aprons
• Roadways
• Bridge Approaches
• Asphalt or Concrete or Composite
• Dips or Faulted Joints
• Leaking Underground Drainage System
• Settlement in Buildings
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Only one lane of traffic is shut down; profile & ride quality has been restored.
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PROBLEMS
• Pavement or Structure Settlement Due to:
• Voids
• Poor Soil Conditions in Sub-base
• Undersized Pavement Structure for Current Mission
• Leaking Underground Drainage System Causing Loss of Soil Support
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MATERIALS
• Composition
• Resin & Hardener
• 1:1 mixing ratio by volume
• Exothermic chemical reaction generates CO2 gas
• CO2 gas causes expansion of material and creates up to 8000 psf lifting pressure
• Fast reaction – complete in < 1 minute
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MATERIALS
• Characteristics
• Lightweight – 3 to 10 pcf (samples)
• Rigid Structural Polymer as material cools
• High Compressive & Tensile Strength
• Compressive Strength, Tensile Strength directly proportional to Density
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MATERIALS
• Characteristics
• Spread is limited due to speed of reaction
• Hydro-insensitive in that it contains water insoluble diluents - can be injected into wet soils and even standing or flowing water
• Unlike cementitious grout
• no shrinkage during curing
• environmentally inert
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URETEK DEEP INJECTION PROCESS
• Drill 5/8” holes in pavement
• Hole pattern is 3’ to 4’ on center
• Insert injection tubes to proper depth
• Holes can be drilled up to 2” to accommodate multiple tubes for multiple injection depths
• Typical injection depths limited to -10’
• Can inject as deep as 40’ if needed
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URETEK DEEP INJECTION PROCESS
• Injection of expansive material through tubes
• Uniform sequential pattern of injection
• Top down pattern
• Strength to weakness
• Inject until a bump is measured at surface indicating sufficient soil improvement
• After stabilization, injection continues if lift of pavement structure is desired
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URETEK DEEP INJECTION PROCESS
• Can inject full range of soils:
• Injection into sand creates sandstone
• Stiff clays – inject above and/or below layer
• Highly organics – material consumption will be high – currently studying techniques to minimize consumption by creating honeycomb “confinement cells” structural support
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URETEK DEEP INJECTION PROCESS
• Fixes the problem by stabilizing the soils and increasing the load bearing capacity of the sub-base in order to better support the load
• Fixes the symptom of the problem by lifting the pavement to grade
• Completed with minimal down-time
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URETEK DEEP INJECTION PROCESS
• Compaction Displacement Grouting Process
• Densification of soils is achieved by the controlled expansive force of the URETEK polymers
• Adequate densification confirmed by movement of bearing load and field testing (e.g., DCP and FWD)
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APPROACH• DIAGNOSE
• Site Visit (e.g., Traffic Issues, Project Execution Issues)
• Soil Performance Data (e.g., Penetration Data)
• Soil Composition Data (e.g., Borings, Lab Results)
• Water Issues
• PRESCRIBE• Assess Applicability
• Select Polymer (Type, Reaction Curve, etc.)
• Develop Injection Plan (Spacing, Depths, Shot Types, etc.)
• Estimate Polymer Quantities
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APPROACH
• TREAT• Execute the project, as designed
• Have Technical Support available to make field adjustments, as required
• FOLLOW-UP• The regional representative will ALWAYS be available
to address questions, comments, or issues
• URETEK USA provides a 2-year “bumper to bumper” warranty on its work
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QUALITY / IMPROVEMENT
• PERSONNEL• Attract and retain quality personnel
• Average Experience for a URETEK supervisor – 10 years• Average Experience for a URETEK technician – 5 years• Quality Assurance Policies
• Guaranteed Number of Hours (Reduce the fear of layoffs)
• Zero Tolerance Drug Policy / Random Drug Testing• Continual Safety Training• Must successfully complete a Probation Period• Good Pay and Benefits Package
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QUALITY / IMPROVEMENT
• PERSONNEL• In 2008, URETEK created Engineering
Department• Hired Randall W. Brown, PhD, PE as Vice
President for Engineering
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Randall W. Brown, PhD, PE – Biographical Information
• CURRENT ASSIGNMENTS• Vice President for Engineering, URETEK USA – August 2008
to Present• President, EPIC – September 2004 to Present
• EDUCATION• Doctor of Philosophy (Civil Engineering - Geotechnical
Specialty) – University of Florida, August 1985• Master of Engineering (Civil Engineering – Construction
Specialty) – University of Florida, December 1982
• Bachelor of Civil Engineering – Auburn University, June 1978
• REGISTRATION• Professional Engineer, State of Texas
QUALITY / IMPROVEMENT
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•
Randall W. Brown, PhD, PE – Biographical Information EXPERIENCE
• Principal Engineer, Applied Research Associates (ARA)• Air Force Research Laboratory (AFRL) Pavements Program• Air Force Civil Engineer Support Agency (AFCESA) Pavements Program
• United States Air Force Civil Engineering Officer• AF Technical Coordinator for Civil Engineering
(@ USACE Waterways Experiment Station)• Associate Professor/ Deputy for Geotechnical Engineering
(USAFA Department of Civil Engineering)• Chief, Civil Engineering Operations and Maintenance
(Andersen AFB Guam)• Chief, Pavement Evaluation Team
(HQ AFESC – Tyndall AFB FL)• Masters/Doctoral Student (University of Florida)• Geotechnical Engineer (AF Weapons Laboratory)
QUALITY / IMPROVEMENT
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QUALITY / IMPROVEMENT
IT MATTERS LITTLE HOW GOOD YOUR PLAN, TECHNIQUE, OR MATERIAL IS UNLESS YOU HAVE QUALITY PEOPLE TO EXECUTE THE SOLUTION
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• MATERIAL• Polyurethane foam (URETEK 486*) now used was
developed and patented (2002) exclusively for URETEK USA
• URETEK 486* is hydro-insensitive meaning it exhibits higher dimensional stability in the presence of water. This is important because water can compromise the chemical reaction that creates polyurethane.
• URETEK orders specialty foams when required for a project, e.g. a limited lift foam was used in the Navy crater repair project
QUALITY / IMPROVEMENT
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• ENGINEERING SUPPORT
• Review Site Assessment Data• Dynamic Cone Penetration (DCP) testing is now standard
practice when evaluating sites
• Regional representatives are expected to work with their clients to collect technical data for use in developing a quality project plan
• Key to recommending the correct treatment for the problem
QUALITY / IMPROVEMENT
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• ENGINEERING SUPPORT
• Discuss Solution Options with Clients
• Develop Training and Education Courses for Regional Representatives
• Regional representatives can better serve their clients through increased knowledge of URETEK materials and processes
QUALITY / IMPROVEMENT
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• RESEARCH & DEVELOPMENT Program
• Develop and Refine Techniques
• Research New Applications
• Investigate Material Properties and Behavior
QUALITY / IMPROVEMENT
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DOD PROJECTS LIST
• ANDREWS AIR FORCE BASE AIRFIELD REPAIR• ADR RESEARCH PROJECT FOR NAVAL FACILITIES
ENGINEERING COMMAND• NAS CORPUS CHRISTI AIRFIELD STABILIZATION
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SPECIFIC APPLICATIONS
• Stabilization and lift of asphalt or concrete runway, taxiway, apron, or roadway
• Stabilization of base/sub-base prior to panel replacement
• Seal leaking joints in drainage pipes• Lift bridge approach/departure slabs• Lift structures – hangars, base housing
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SPECIFIC APPLICATIONS
• Do you have any problems similar to those discussed in this briefing?
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QUESTIONS?
• PATH FORWARD……