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Pavement Lifting

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INSITU STABILIZATION of SOILS by INJECTION of HIGH-DENSITY POLYURETHANE: PRINCIPLES AND APPLICATIONS aka Insitu Soil Stabilization By Injecting Polyurethane or – PowerPoint PPT presentation

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Title: Pavement Lifting


1
INSITU STABILIZATION of SOILS by INJECTION of
HIGH-DENSITY POLYURETHANE PRINCIPLES AND
APPLICATIONS aka Insitu Soil Stabilization By
Injecting Polyurethane or ISSBIP Michael R.
Vinton Vice President - Sales
  • Pavement Lifting Soil Stabilization Control

2
AGENDA
  • GOAL
  • ISSBIP DEFINITION
  • ISSBIP TENETS
  • ISSBIP SOIL / POLYMER INTERACTION
  • ISSBIP ADVANTAGES
  • ISSBIP APPLICATIONS
  • SUMMARY

3
GOAL
  • Provide essential information on ISSBIP to
    engineering professionals involved in evaluating
    insitu soil stabilization alternatives

4
ISSBIP DEFINITION

The ISSBIP process is a technique for
stabilizing weak and/or poorly compacted soils
insitu and leveling structures (including
pavements) by injecting a specially-formulated
polyurethane into the soils
5
ISSBIP DEFINITION
  • ISSBIP Polyurethane Description
  • Low viscosity when introduced into the soil
  • 2-component Resin Hardener (11 by volume)
  • Formulated to resist water intrusion into the
    reaction
  • Exothermic chemical reaction generates CO2 gas
  • CO2 gas causes expansion of the polymer and
    creates pressure on the surrounding environment

6
ISSBIP DEFINITION
  • ISSBIP Polyurethane Description
  • Rapid Cure
  • Reaction complete in lt 1 minute
  • Can support traffic after 20 minutes
  • Full strength in 24 hours
  • Rigid Structural Polyurethane created as the
    material cures
  • Installed density range 3 to 20 pcf

7
ISSBIP DEFINITION
  • ISSBIP Process Description
  • The heated components are introduced in the
    impingement gun and forced down the injection
    tube by air pressure
  • The low viscosity polymer flows easily into the
    voids and weak zones in the soil mass
  • As the reaction occurs, the expanding polymer
    compacts the surrounding soils continued
    injection yields lift
  • Reaction mass necessary for compaction is
    achieved by 1) weight of pavement and overlying
    soil2) stablized mass in the upper elevations by
    employing a top-down injection pattern

8
ISSBIP TENETS
  • Polymer is placed via an injection tube
    surgically placed in the strata where
    stabilization is needed
  • Multiple injection tubes are used to promote full
    coverage throughout the area being stabilized
  • Injected substance is a two-component,
    high-density polyurethane characterized by rapid
    expansion and large volume increase created by
    chemical reaction between the components
  • Movement is monitored at the surface during the
    injection process

9
ISSBIP SOIL / POLYMER INTERACTION
  • Complex Issue
  • Governed by both soil and polymer properties
  • Can be further impacted by adjusting operational
    parameter (heat)
  • Soil Properties density, grain size, porosity,
    permeability, degree of saturation
  • Polymer Properties chemical composition and
    viscosity
  • Operational Parameters injection temperature,
    shot duration, and shot sequencing

10
ISSBIP SOIL / POLYMER INTERACTION
  • Aggregate Bases/Subbases and Coarse Sand
  • Polymer Infiltration (binding)
  • Polymer Expansion (compacting)
  • Saturated Fine Sands
  • Polymer expansion displaces the water and
    flowable soils
  • Polyurethane encapsulates the remaining soil and
    begins to set up

11
ISSBIP SOIL / POLYMER INTERACTION
  • Layers with Silts and Clay Size Particles
  • Polymer infiltrates the weak lenses in these
    layers
  • Polymer begins to expand encapsulating and
    compacting the surrounding soils

12
ISSBIP SOIL / POLYMER INTERACTION
  • Organic Soils
  • When operating in soft soils, the polymer
    reaction time is accelerated so the polymer
    spends little time moving laterally
  • The rapid reaction time causes the polyurethane
    to form a vertical shear wall within the soft
    soil mass
  • By designing the injection pattern, these walls
    can be shaped into an interconnected series of
    confinement cells capable of supporting loads

13
ISSBIP SOIL / POLYMER INTERACTION
  • PHOTOGRAPHS

14
Stabilization of Aggregate Subbase
14
14
15
Excavation Revealing ISSBIP-Stabilized Sand
15
15
16
Excavating Native Soil to Expose Crater Repair
Note Polymer Veins
17
Intact Extraction of Stabilized Crater Repair
18
Forensic Excavation of ISSBIP-StabilizedPeat
Deposit
18
18
19
Forensic Excavation of ISSBIP-StabilizedPeat
Deposit
19
19
20
ISSBIP ADVANTAGES
  • Fast can withstand traffic in 20 minutes
    achieves full strength within 24 hours
  • Reduced Disruption Minimally Invasive Process
  • Predictable Highly Controlled Expansion
  • Accuracy Precision Alignment of Faulted Slabs

21
ISSBIP ADVANTAGES
  • Lightweight Provides strength (with minimal
    weight) to the already distressed soil
  • High utility a single process which can solve
    multiple problems
  • Permanent Impervious to Water and Most
    Chemicals
  • Eco-Friendly Environmentally Benign Material
    NSF 61 Certified (can use around potable water)

22
ISSBIP APPLICATIONS
  • Settled or Poorly-supported Transportation Assets
  • Runways, Taxiways, Aprons
  • Roadways
  • Bridge Approaches
  • Asphalt, Concrete, or Composite Pavements
  • Dips or Faulted Joints
  • Railroads
  • Leaking Underground Drainage Systems
  • Settled or Poorly-supported Structures

23
DOD TRANSPORTATION PROJECTS
  • Andrews AFB MD Soil Stabilization and Pavement
    Lifting under Air Force One Runway (repair in
    place August 1999 until December 2010)
  • Tyndall AFB FL Soil Stabilization and Void
    Filling under the Drone Recovery Dock (repair
    in place February 2004 until present)
  • MacDill AFB FL Void Filling under an Apron
    (repair in place April 2004 until present)

24
DOD TRANSPORTATION PROJECTS (SINCE TSW 2008)
  • NAS Corpus Christi Soil Stabilization under a
    Runway (2010)
  • Lackland AFB TX Joint Alignment and Soil
    Stabilization under
    an Apron (2011)
  • NFESC Develop an Airfield Damage Repair (ADR)
    system for US Navy
    Reference TR-NAVFAC ESC-EX-1201, Cody M. Reese,
    Jan 2012
  • AFRL Alignment and Stabilization of Pre-cast
    Slabs for USAF repair system
    Reference TSW 2012 Paper 89 (Ashtiani, Saeed,
    Hammons) to be presented Thu 8 Mar 12,
    1015, in the San Antonio Room

25
ISSBIP SUMMARY
  • Fixes the problem by stabilizing the soils and
    increasing the stiffness of the weak layers in
    order to better support the load
  • Fixes the symptom of the problem by lifting the
    settled pavement or structure to the desired
    grade
  • Completed with minimal downtime

26
URETEK BINDER
  • LTRC Report 05-1TA
  • TX DOT Dar Hao Chen Paper and US 385 Data
  • 3 UDI White Paper, TSW 2012 Paper
  • 4 ADR Forensic Photos NAVFAC Press Release
  • 5 DCP Information
  • 6 TX DOT Beaumont Report JCP Stabilization
  • 7 MO DOT Carroll County Report Asphaltic
    Concrete Stabilization
  • 8 TRB 2011 Paper Presentation Precast
    Panels AFRL/ARA
  • 9 VDOT Stabilization of sub-base/sub-grade
    prior to pavement removal
  • 10 FHWA Guidelines regarding Patented Processes
  • 11 Specifications examples calling out
    patented process
  • 12 Summary of UDI projects for LADOTD
  • 13 US 171 Pilot Project Proposal

27
  • THANK YOU
  • FOR
  • YOUR TIME

28
ISSBIP ADVANTAGES
  • Comparison of High-Density Polyurethane Grouts to
    Cementitious Grouts
  • Both are useful tools when applied correctly
  • High-density polyurethane grouts have an
    advantage in key applications (particularly
    transportation) because
  • No shrinkage during curing (dimensionally stable)
  • Environmentally benign
  • Provide strength with minimal additional weight
  • Resist disintegration when subjected to vibration
  • Lower viscosity promotes more infiltration into
    the soil matrix
  • Possess tensile strength
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