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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……

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Norberto LaureanoUretek

Representativenlaureano@uretekusa.com

(832)435-0313