WELCOME. Key Points Delay crack return and severity to preserve pavement life and ride quality RMACES 2016

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RMACES 2016 WELCOME War on Cracks Wide Cracks How High Tensile Glass Can Help Dennis Rogers, Tensar Pavement Maintenance Manager, West All Data & analysis courtesy of John

Interlayer options to mitigate 3. Installation techniques 4. New high strength options 5.

1 RMACES 2016 WELCOME War on Cracks Wide Cracks How High Tensile Glass Can Help Dennis Rogers, Tensar Pavement Maintenance Manager, West All Data & analysis courtesy of John Bryce of Harris & Associates Key Points Delay crack return and severity to preserve pavement life and ride quality 1. Dynamics of severe crack stresses 2. Interlayer options to mitigate 3. Installation techniques 4. New high strength options 5. Value Summary All Data & analysis courtesy of John Bryce of Harris & Associates Types of Deteriorating Cracks Reflective Cracking PCC Joint Cracking Thermal Cracking Lane Widening It is important to understand the type of movements associated with a particular crack type 1

2 Thermal Cracks Rapid Deterioration-Rough Ride Pavement Deterioration Delay Interlayer Functions that Delay Deterioration Mitigates Weather / Environmental Effects Stops water intrusion Point Load Distribution Top HMA-WMA Layers Stress Absorbing/Dispersing Paving Interlayer Bottom HMA Layers Delay Crack Return and Severity Mitigate Impact of Thermal Movement Aggregate Base Protected from moisture saturation Interlayer Reinforcement Definition: Increase the structural life of the asphalt overlay by using an interlayer with a modulus advantage over the asphalt Similar to steel in concrete Tensile / Elongation relationship 2

3 Interlayer Reinforcement Elongation impact on Tensile Reinforcement Elongation determines when tensile of the interlayer is engaged to delay crack under strain Pavement at <5% Elongation Pavement at >5% Elongation HMA/WMA Layer, Min. 2" HMA/WMA Layer, Min. 2" Paving Interlayer to provide a moisture barrier and delay cracks Hot PG Asphalt Binder New or Existing HMA surface with cracks > 1/4" filled or Leveling course, Existing base layer Paving Interlayer to provide a moisture barrier and delay cracks Hot PG Asphalt Binder New or Existing HMA surface with cracks > 1/4" filled or Leveling course, Existing base layer Interlayer Reflective Crack Reduction Elongation impact on Tensile Reinforcement Crack Mitigating Factor Texas Transportation Institute (TTI) Graph of Overlay Tester Results 0.0 Type Control Elongation % <5 <5 <5 <5 <5 <5 <5 >15 >50 - Crack Mitigation Factor (CFM) High Strength Glass Delays Cracks No cracks keep water out of base Preserves Structural Integrity Grid Paving Interlayer HMA-WMA Overlay Single chip seal Existing Cracked Pavement Delays reflective cracking Eliminates surface water infiltration Surface water infiltration into base 3

Near 50% Loss 37 days/yr Performance Validation In Place Performance Testing High Strength Glass Performance Measures In Place Validation Testing 4 Point Strain

4 Near 50% Loss 37 days/yr Performance Validation In Place Performance Testing High Strength Glass Performance Measures In Place Validation Testing 4 Point Strain Controlled Beam Test 160, , ,000 ן 2 TIMES ן Stiffness 100,000 80,000 60,000 40,000 20,000 UnReinforced Reinforced Cycle 4

5 High Strength Glass Performance Measures In Place Validation Testing Plate Load Testing Figure 2 : Large Vehicle with 18Kip Axle Loads to Perform the Plate Load Test High Strength Glass Performance Measures In Place Validation Testing Plate Load Test Results 1.5 TIMES Structural Contribution This test with this pavement structure the GlasGrid TF reinforced slabs have a structural contribution that is approximate 1.5 times stronger than that of the control slab. This structural improvement can be applied to the AASHTO SN equation to determine what the contribution of the GlasGrid TF is to the layer coefficient. Installation & Performance 5

6 Crack Repair Install Mill 6 12 on each side beyond edge of crack Crack Repair Install Clean well and prime then add leveling course Crack Repair Install Level out and compact leveling course 6

7 Crack Repair Install Install Grid for complete coverage, add HMA overlay Crack Repair Install Level HMA overlay and compact to complete repair Repair Performance

8 Repair Performance Slurry Sealed Grid Crack Repair Crack Repair Install 7 Years Later 8

Geosynthetic Crack Repair Options Current Peel & Stick Crack Repair products provide no reinforcement All Data & analysis courtesy of John Bryce of Harris & Associates Current Options all Non

9 Geosynthetic Crack Repair Options Current Peel & Stick Crack Repair products provide no reinforcement All Data & analysis courtesy of John Bryce of Harris & Associates Current Options all Non Fiberglass Technology Elongation impact on Tensile Reinforcement Crack Mitigating Factor # Tensile Texas Transportation Institute (TTI) Graph of Overlay Tester Results Current Peel & Stick products elongate >15% so cannot reinforce to delay crack return 0.0 Type Control Elongation % <5 <5 <5 <5 <5 <5 <5 >15 >50 - Crack Mitigation Factor (CFM) BREAKING NEWS NEW High Tensile Peel & Stick Easy to Install Crack Repair Products High Strength 570 to 1140# Glass Grid High Strength 200# Glass Mat 9

New Options for Crack Repair Install to waterproof bridge decks, centered

for quick, easy bridge deck, crack and spot repair, High Strength 570

Size 4 X 50 2 X 100 1 X 200 High Strength Rapid Repair Crack Repair Detail

570# to 1140# Tensile High Strength Glass Grid Peel & Stick Waterproof

1 beyond edge of trench Original HMA Thickness New Compacted HMA/WMA Layer,

trench Mill and clean old existing HMA New Compacted 2" HMA Mill and clean

10 New Options for Crack Repair Install to waterproof bridge decks, centered over cracks or spot repair, extending 6 12 on each side, rubber tire roll prior to overlay with HMA. New Options for Crack Repair Peel & Stick Maintenance and Repair products for quick, easy bridge deck, crack and spot repair, prior to overlay with HMA. High Strength # Glass Grid High Strength 200# Glass Mat Roll Size 4 X 50 2 X 100 Roll Size 4 X 50 2 X X 200 High Strength Rapid Repair Crack Repair Detail Trench/Wide Crack T Lock High Strength Rapid Repair System Option One Using 570# to 1140# Tensile High Strength Glass Grid Peel & Stick Waterproof Membrane Mill min. 1 beyond edge of trench Trench Width Varies Mill min. 1 beyond edge of trench Original HMA Thickness New Compacted HMA/WMA Layer, Min. 2" High Strength Glass Grid Patch extending min of 12" beyond edge of trench Mill and clean old existing HMA New Compacted 2" HMA Mill and clean old existing HMA Flow Fill Original HMA Thickness Trench Depth Varies Mill 12 on each side beyond edge of crack 10

11 High Strength Rapid Repair Crack Repair Detail Option Two Trench/Wide Crack Repair with full street Overlay Mill min. 1 beyond edge of trench Trench Width Varies Mill min. 1 beyond edge of trench New Compacted HMA/WMA Layer, Min. 2" Original HMA Thickness 170# Glass Paving Mat Interlayer over entire width New Compacted HMA/WMA Layer 3/4" High Strength Glass Grid Patch extending min of 12" beyond edge of trench Mill and clean old existing HMA New Compacted 2" HMA Mill and clean old existing HMA Flow Fill Original HMA Thickness Trench Depth Varies Mill 12 on each side beyond edge of crack High Strength Rapid Repair Crack Repair Detail Option Three Trench/Wide Crack T Lock Highest Strength Glass Repair Crack Control System Using 570# to 1140# Tensile High Strength Glass Grid Peel & Stick Waterproof Membrane Mill min. 1 beyond edge of trench Trench Width Varies Mill min. 1 beyond edge of trench Original HMA Thickness New Compacted HMA/WMA Layer, Min. 2" High Tensile Glass Grid Peel & Stick Extend 12" High Tesile Glass Grid Peel & Stick Extend 12" Mill and clean old existing HMA New Compacted 2" HMA Mill and clean old existing HMA Flow Fill Original HMA Thickness Trench Depth Varies Mill 12 on each side beyond edge of crack Advantage Summary 1. Maximum Crack Delay High Tensile Glass, Low elongation All Data & analysis courtesy of John Bryce of Harris & Associates 11

12 Advantage Summary 1. Maximum Crack Delay High Tensile Glass, Low elongation 2. Keep Base Dry Waterproof All Data & analysis courtesy of John Bryce of Harris & Associates Advantage Summary 1. Maximum Crack Delay High Tensile Glass, Low elongation 2. Keep Base Dry Waterproof 3. Low Cost Easy to install No extra Equipment Use own crew All Data & analysis courtesy of John Bryce of Harris & Associates Advantage Summary 1. Maximum Crack Delay High Tensile Glass, Low elongation 2. Keep Base Dry Waterproof 3. Low Cost Easy to install No extra equipment Use own crew Most cost effective way to All Data delay & analysis courtesy of cracks John Bryce of Harris & Associates and waterproof 12

Thank You QUESTIONS? Dennis Rogers, Reg. Mgr. Pavement Maintenance Cell: 760 668 3406 Email: drogers@tensarcorp.com www.

com All Data & analysis courtesy of John Bryce of Harris & Associates INTERMISSION All Data & analysis courtesy of John

13 Thank You QUESTIONS? Dennis Rogers, Reg. Mgr. Pavement Maintenance Cell: All Data & analysis courtesy of John Bryce of Harris & Associates INTERMISSION All Data & analysis courtesy of John Bryce of Harris & Associates RMACES 2016 WELCOME Pavements perform better when paving interlayers are used Dennis Rogers, Tensar Pavement Maintenance Manager, West All Data & analysis courtesy of John Bryce of Harris & Associates

THE ROAD TO SUCCESS IS ALWAYS UNDER CONSTRUCTION Paving it Forward for Better Pavements

Associates Geosynthetics Used in Construction Reinforced Slopes Erosion Control Retaining

14 THE ROAD TO SUCCESS IS ALWAYS UNDER CONSTRUCTION Paving it Forward for Better Pavements Through Change and Evolution All Data & analysis courtesy of John Bryce of Harris & Associates Geosynthetics Used in Construction Reinforced Slopes Erosion Control Retaining Walls Embankment Stabilization Pavement Optimization Subgrade Stabilization & Pavement Optimization THE GOOD NEWS (SEC. 1428, FAST ACT) Federal Highway Administration shall encourage the use of geosynthetic materials All Data & analysis courtesy of John Bryce of Harris & Associates 14

15 Key Points Delay deterioration to preserve pavement structure and extend its life 1. Pavement deterioration 2. Interlayer types and function to address 3. Validation of interlayer capability 4. Cost / Benefit of using Interlayers 5. Installations and performance 6. Value Summary All Data & analysis courtesy of John Bryce of Harris & Associates Pavement Deterioration Distressed Pavements Pavement Deterioration Distressed Pavements 15

Thermal Movement PAVEMENT SECTION Base Types of Deteriorating Cracks High Stress Cracks PCC Joint

16 Pavement Deterioration Distressed Pavements Pavement Deterioration Deteriorating Forces 2. Water intrusion 3.Traffic Loading 4. Aged/Weathered 1. Stress Cracks Reflective Fatigue Thermal 5.Thermal Movement PAVEMENT SECTION Base Types of Deteriorating Cracks High Stress Cracks PCC Joint Cracking Thermal Cracking Lane Widening It is important to understand the type of movements associated with a particular crack type 16

Pavement Deterioration Delay Interlayer Functions that Delay Deterioration Mitigates Weather / Environmental Effects

Absorbing/Dispersing Paving Interlayer Bottom HMA Layers Delay Crack Return and Severity Mitigate Impact of Aggregate

Distress Slight Cracks Moderate Cracks Severe Cracks FABRIC (PP) Moisture Barrier MAT Glass Reinforce ment + Moisture

17 Pavement Deterioration Delay Interlayer Functions that Delay Deterioration Mitigates Weather / Environmental Effects Stops water intrusion Point Load Distribution Top HMA-WMA Layers High tensile can improve TI Stress Absorbing/Dispersing Paving Interlayer Bottom HMA Layers Delay Crack Return and Severity Mitigate Impact of Aggregate Base Protected from moisture saturation Fatigue & Thermal Movement Interlayer Selection Interlayer Selection by Road Distress Slight Cracks Moderate Cracks Severe Cracks FABRIC (PP) Moisture Barrier MAT Glass Reinforce ment + Moisture Barrier GRID Glass Reinforce ment + Improved TI + Moisture Barrier ADT ESALS Traffic Loads Fatigue & Thermal Cracks Over Stable Base 17

Mitigate crack formation and severity Reinforcement Adds tensile to absorb/deflect stress Mass to absorb

18 Function Interlayer System Capabilities When correct interlayer selected to match the cause of pavement deterioration 1. Mitigate crack formation and severity Reinforcement Adds tensile to absorb/deflect stress Mass to absorb stress 2. Form moisture barrier Preserves base structural value 3. Improve pavement structure Properly placed high tensile interlayers can improve TI 4. Recycle RAP from milling can be added back into new mix 18

19 3/27/

20 3/27/

21 Interlayer Function Interlayer Reinforcement Definition: Increase the structural life of the asphalt overlay by using an interlayer with a modulus advantage over the asphalt Similar to steel in concrete Tensile / Elongation relationship Interlayer Reinforcement Elongation impact on Tensile Reinforcement Elongation determines when tensile of the interlayer is engaged to delay crack under strain Pavement at <3 5% Elongation Pavement at >5% Elongation HMA/WMA Layer, Min. 2" HMA/WMA Layer, Min. 2" Paving Interlayer to provide a moisture barrier and delay cracks Hot PG Asphalt Binder New or Existing HMA surface with cracks > 1/4" filled or Leveling course, Existing base layer Paving Interlayer to provide a moisture barrier and delay cracks Hot PG Asphalt Binder New or Existing HMA surface with cracks > 1/4" filled or Leveling course, Existing base layer 21

Interlayer Reinforcement Elongation impact on Tensile Reinforcement Crack Mitigating Factor 6.0 5.0 4.0 3.0 2.0 1.0 Texas Transportation Institute (TTI) Graph of Overlay Tester Results 0.

22 Interlayer Reinforcement Elongation impact on Tensile Reinforcement Crack Mitigating Factor Texas Transportation Institute (TTI) Graph of Overlay Tester Results 0.0 Type Control Elongation % <5 <5 <5 <5 <5 <5 <5 >15 >50 - Crack Mitigation Factor (CFM) Interlayer Creates Moisture Barrier Seals cracks to keep water out of base Preserves load bearing capacity Asphalt Saturated Paving Interlayer HMA-WMA Overlay Single chip seal Existing Cracked Pavement Delays reflective cracking Eliminates surface water infiltration Surface water infiltration into base Near 50% Loss 37 days/yr 22

Deteriorating Impact of Moisture Intrusion Moisture intrudes through pavement: 33 67% Asphalt up to 50% Concrete up to 67% FHWA REPORT: FHWA/RD 73/14 One major

Caltrans Pavement Evaluation Manual Pavement Condition Survey John Poppe Interlayer Selection by Function Function Crack Stress Relief and Delay Stress

Maybe* Fiberglass Tensile Reinforcing Geosynthetic Interlayers Mat Fiberglass/Polyester Med Up to 50kN YES YES Composite Grid Med-High Up to 100kN YES Maybe*

23 Deteriorating Impact of Moisture Intrusion Moisture intrudes through pavement: 33 67% Asphalt up to 50% Concrete up to 67% FHWA REPORT: FHWA/RD 73/14 One major factor that degrades a roadbed s ability to function is the infiltration of water into the base material. Caltrans Pavement Evaluation Manual Pavement Condition Survey John Poppe Interlayer Selection by Function Function Crack Stress Relief and Delay Stress Absorbing Tensile Reinforcement Stress Absorbing Geosynthetic Interlayer Moisture Barrier Membrane Mills + Recycles into new mix Fabric Polypropylene Low NO YES Maybe* Fiberglass Tensile Reinforcing Geosynthetic Interlayers Mat Fiberglass/Polyester Med Up to 50kN YES YES Composite Grid Med-High Up to 100kN YES Maybe* Grids PreCoated Self Adhesive High Up to 200kN NO YES PreCoated Self Adhesive TF Max High Up to 200kN YES YES *Claim is that when fully saturated with asphalt will mill and recycle completely, Need independent confirmation. 23

Interlayer Performance Testing Interlayer

Sample Interlayer Performance Measures 4 Point

Load (lbs) 1000 800 600 400 200 GP50#3 GP50#1

24 Interlayer Performance Testing Interlayer Performance Measures TTI Overlay Tester Typical Sample Interlayer Performance Measures 4 Point Notched Beam Test Repeatability Load (lbs) GP50#3 GP50#1 GP50# Displacement (Inches) 24

Texas Transportation Institute Overlay Tester Interlayer Test Results 6.0 Crack Mitigating Factor 5.0 4.0 3.0 2.0 1.0 0.0 Tensile (kn) Type 50 50 50 25 50 6.

Strength Grid In-Asphalt Performance Measures In Place Validation Testing 4 Point Strain Controlled Beam Test 160,000 140,000 120,000 Stiffness 100,000 80,000 60,000

25 Texas Transportation Institute Overlay Tester Interlayer Test Results 6.0 Crack Mitigating Factor Tensile (kn) Type gt 101gt PM CG CG PM CG PM CG Grid Fabric No Interlayer Type Coated Glass Uncoated Glass Polyest PolyProp PM=Paving Mat, CG=Composite Grid, gt=grab Tensile High Strength Grid In-Asphalt Performance Measures In Place Validation Testing 4 Point Strain Controlled Beam Test 160, , ,000 Stiffness 100,000 80,000 60,000 40,000 20, Cycle GlasGrid TF Structural contribution 2 times stronger than the control Interlayer Performance Measures 4 Point Notched Beam Testing 25

High Strength Grid In-Place Performance Measures In Place Validation Testing Plate Load Testing Figure 2 : Large Vehicle with

Plate Load Test Results This test with this pavement structure the GlasGrid TF reinforced slabs have a structural contribution

This structural improvement can be applied to the AASHTO SN equation to determine what the contribution of the GlasGrid TF is to

26 High Strength Grid In-Place Performance Measures In Place Validation Testing Plate Load Testing Figure 2 : Large Vehicle with 18Kip Axle Loads to Perform the Plate Load Test High Strength Grid In-Place Performance Measures In Place Validation Testing Plate Load Test Results This test with this pavement structure the GlasGrid TF reinforced slabs have a structural contribution that is approximate 1.5 times stronger than that of the control slab. This structural improvement can be applied to the AASHTO SN equation to determine what the contribution of the GlasGrid TF is to the layer coefficient. Sample Structural Equivalency Based on the analysis performed using the proposed sections, using GlasPave 50 can be equivalent to a thickness of 2 of HMA summarized in Table 1 26

Interlayer Placement Within Tension Zone for Maximum Performance Interlayer placement within the HMA Tension Zone is determined based on total pavement construction and traffic loading Traffic

27 Interlayer Placement Within Tension Zone for Maximum Performance Interlayer placement within the HMA Tension Zone is determined based on total pavement construction and traffic loading Traffic Loading HMA Base Compression Zone Tension Zone Interlayer can provide reflective crack reduction and moisture barrier High Tensile Interlayer In addition, High Strength Interlayers can provide structural contribution Native Soil General rule: Deeper gives maximum tensile contribution Place interlayer as low in matrix as budget allows. Can mill and fill to replace the surface wearing course and not disturb and need to buy and reinstall the interlayer In-Place Interlayer Effectiveness 60 % / 20% / 5 yrs $5.71 $7.50 $11.43 Comparison of reflective cracks Texas DOT TRB, January 1989 Add Fabric Cost 31% more 70% less cracks + moisture barrier Double AC--Cost 52% for 75% less cracks BUT no moisture barrier BUDGETARY 50kN Paving Mat Interlayer Cost/Benefit Calculation Value of crack mitigation, base structure preservation and maintenance savings Total Cost of HMA/WMA Pavement ONLY with NO Paving Interlayer Total Cost Installed HMA/WMA/RHMW Installed Lbs/" Tons/" $/SF $/SY Local Cost: $97.00 Ton Density $0.77 $6.89 Cos t/in Inch Thickness Cost for evaluation, engineering, design, specs, traffic control, construction inspection, QA/QC Total Cost of Pavement with NO Interlayer Cost to fill cracks for the years cracks not delayed Total Cost of Pavement plus added crack fill cost 2.0 $1.53 $13.77 $2.00 $0.22 $2.00 $0.00 $ $0.33 $3.00 CMF* Yrs to Crack¹ SY Cost Per Year $2.09 $ $9.39 ¹ The industry standard is that cracks reflect through HMA at the rate of 1 inch per year on average. ² Crack fill maintenance cost from Maryland study $0.30 Per SY/Per Yr Crack delay and reduced severity = less road closure and maintenance. 27

28 OPTION 3: Total Cost of HMA/WMA Thickness to achieve same crack free years HMA/WMA thickness needed to achieve same reflective crack reduction¹ as GP50, but no waterproofing 12.0 $8.10 Interlayer Performance Expectations Interlayers probably would not have helped! Expectations for Success Extreme Pavement and Base Failures Mix Rutting Slab Fracture/Uneven Extreme Fatigue Cracking Wide Thermal Cracks Depressed pavement/unstable base Caution! Not all conditions interlayer appropriate! 28

Paving Interlayer Performance Rules for Success a.

29 Paving Interlayer Performance Rules for Success a. Proper selection, know limitations Paving Interlayer Performance Rules for Success a. Proper selection, know limitations b. Proper site preparation Paving Interlayer Performance Rules for Success a. Proper selection, know limitations b. Proper site preparation c. Asphalt binder application Hot PG NOT Emulsion 29

Paving Interlayer Performance Rules for Success a. Proper selection, know limitations b.

Large wrinkles cut, laid flat Large wrinkles cut, laid flat e.

30 Paving Interlayer Performance Rules for Success a. Proper selection, know limitations b. Proper site preparation c. Asphalt binder application Hot PG NOT Emulsion d. Large wrinkles cut, laid flat Paving Interlayer Performance Rules for Success a. Proper selection, know limitations b. Proper site preparation c. Asphalt binder application Hot PG NOT Emulsion d. Large wrinkles cut, laid flat e. Overlay thickness Paving Interlayer Performance Rules for Success a. Proper selection, know limitations b. Proper site preparation c. Asphalt binder application Hot PG NOT Emulsion d. Large wrinkles cut, laid flat e. Overlay thickness Control with Specs and QA/QC 30

31 Interlayer Minimal Index Property Spec. Caltrans Paving Mat Spec B Paving Mat Geosynthetics used for paving mat must be a nonwoven fiberglass and polyester hybrid material. Paving mat must comply with: Geosynthetic Paving Mat Property ASTM Specification Breaking Force lb/2" Min. D Ultimate Elongation % Max. D Mass per unit area Ox/SY Min. D Melting point F D Asphalt Retention Gal/yd² D Interlayer Index + Performance Properties Measures to Specify In Place performance PEREFORMANCE AND PHYSICAL PROPERTIES OF FIBERGLASS POLYESTER PAVING MAT Property Test Method Units MARV* In Asphalt Performance Requirements Stress Improvement Factor TTI Overlay Tester Relative to Contr 6 Permeability FM cm/sec < 6x10-08 Recyclability without screening AASHTO T % > 95% of control Index Properties for Quality Control Asphalt Retention ASTM D6140 l/m2 (gal./yd2) 0.46 (0.10) Mass per unit area ASTM D5261 g/m2 (oz/yd2) 237 (7.0) Tensile strength, MD ASTM D5035 kn/m (lb/in) 50 min (280) Tensile Strength, CD ASTM D5035 kn/m (lb/in) 50 min (280) CBR Puncture** ASTM D6241 N 1779 (400) Elongation at maximum load, MD ASTM D5035 percent <5 Elongation at maximum load, CD ASTM D5035 percent <5 Melting point ASTM D276 C ( F) >232 (>450) * MARV = Minimum Average Roll Value ** Assess 360 ⁰ tensile strength symmetry Using a PG64 hot mix asphalt with a 12.5mm nominal maximum aggregate size Using a hot mix asphalt 2 thick with a permeability > 6 x 10e -06 cm/sec 30% by weight of RAP was used for both the control RAP and GlasPave Rap Interlayer Installation 31

32 Interlayer Installation Typical Street Street Prep 32

33 Spread Hot Asphalt Binder Grid Install Paving Grid Install Paving Mat Install 33

34 Paving Fabric Install Paving Overlay Install Grid Install Paving Overlay Install 34

35 Finished Paving Interlayer Experience Pat Hill 30+ Years using interlayers Greeley Projects Agency Experience 27 th St Greeley, CO - AFTER 9 Yrs. Service road, heavy traffic, on poor soils Milled and leveled roadway, installed Glass Grid and 3 Modified HMA overlay 35

36 Agency Experience Basket Ball Court Crack Repair, Geeley, CO Repair using glass grid AFTER 7 Yrs. Glass grid installed with 2.5 HMA overlay 2012 Performance Comparison 2008 NO INTERLAYER 2 HMA Overlay No Interlayer Section1 Installed Performance Comparison 2006 Paving Mat Installation 2012 Section 2 Installed

37 Performance Comparison Paving Mat Installation Performance Comparison Lake Oswego, OR Boones Ferry Sep 2007 BEFORE Paving Mat Performance Comparison Lake Oswego, OR Boones Ferry AFTER Paving Mat Jun

Performance Comparison Lake Oswego, OR Boones Ferry No Interlayer 2 HMA Overlay After 7 Years Jun 2014 Interlayer Advantage Summary Your roads can: 1.

38 Performance Comparison Lake Oswego, OR Boones Ferry No Interlayer 2 HMA Overlay After 7 Years Jun 2014 Interlayer Advantage Summary Your roads can: 1. be crack free and smoother longer ROADS WITH INTERLAYERS LAST LONGER Interlayer Advantage Summary Your roads can: 1. be crack free and smoother longer 2. have dry road base structure ROADS WITH INTERLAYERS LAST LONGER 38

be closed less and cost less ROADS WITH INTERLAYERS LAST LONGER have higher structural strength 4. be closed less and cost less 5.

39 Interlayer Advantage Summary Your roads can: 1. be crack free and smoother longer 2. have dry road base structure 3. have higher structural strength ROADS WITH INTERLAYERS LAST LONGER Interlayer Advantage Summary Your roads can: 1. be crack free and smoother longer 2. have dry road base structure 3. have higher structural strength 4. be closed less and cost less ROADS WITH INTERLAYERS LAST LONGER Interlayer Advantage Summary Your roads can: 1. be crack free and smoother longer 2. have dry road base structure 3. have higher structural strength 4. be closed less and cost less 5. be higher PCI rated roads ROADS WITH INTERLAYERS LAST LONGER 39

PAVEMENTS PERFORM BETTER WITH AN INTERLAYER ALL pavements - new, rehab or overlay should include an interlayer 6.0 Crack Mitigating Factor 5.0 4.0 3.0 2.0 1.0 0.

40 PAVEMENTS PERFORM BETTER WITH AN INTERLAYER ALL pavements - new, rehab or overlay should include an interlayer 6.0 Crack Mitigating Factor Results from Texas Transportation Institute Overlay Tester of pavements with different types of interlayers No Interlayer Thank You QUESTIONS? Dennis Rogers, Reg. Mgr. Pavement Maintenance Cell: drogers@tensarcorp.com 40