Pavement Preservation Roundtable

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Presentation transcript:

Pavement Preservation Roundtable Pavement Strengthening: Combining the Compressive Strength of Asphalt with the Tensile Strength of Glass By Nicholas Reck (MSc.Eng, Pr.Eng) Benton County, 2/16/2016

Content Applications Current Interlayer Product Range Recent Testing Data Specifications Questions

Applications 1.5” Asphalt Overlays or More Moisture Barrier Crack Relief Structural Reinforcement

Products (Existing) Grid Types In USA Structure Types Polyester Composite Only Fiberglass Open and Composite Steel Open Only Consider : Asphalt Modulus vs Grid Type Modulus at all Temperatures Consider Crack Type Speed of Movement vs Grid Type Modulus Consider Structure for maximum contribution of Grid Type

Products (Existing) GlasGrid GlasPave GlasGrid 8501 GlasPave25

Applications Updated Product Selection Guide:

Testing NCSU Results Plate Load Testing TTI Overlay Testing

Beam Tests (Lots of Variables!!) Notched (Fatigue) NCSU Study Beam Tests (Lots of Variables!!) Notched (Fatigue) Un-notched (Crack Reflection) 100kN GlasGrid (1/2” and 1” apertures) 3 Tack Coats (PG, SS1, TF) 1 Temperature Approximately 3 years to complete vs Nottingham at 5 years

4 Point Strain Controlled Beam Test NCSU Study 4 Point Strain Controlled Beam Test Cyclic Loading Composite stiffness loss Ref. NCSU Study Publish at TRB in 2015

Function: Reinforcement 4 Point Strain Controlled Beam Testing 2 Times Reinforced Unreinforced 11/24/201811/24/201811/24/2018

Plate Load Testing

Function: Reinforcement Plate Load Testing Results 1.5 Example of field test results. This chart reflects the normalized results of 3 test sites – Tijuana, Mexico – Las Vegas, NV – Wilmington, NC Improvement of pavement structure modulus with 8511(TF) From Graph: Modulus of control = 33,521 psi Modulus of reinforced section = 50,045 psi Structural improvement with 8511(TF) Si = 50,045 / 33,521 Si = 1.5

Monatomic Asphalt Overlay Testing Overlay Tester Typical Sample

Monatomic Asphalt Overlay Testing Why Ease of Sample fabrication 6” diameter gyratory core samples Could be done on any project specific mix High level of repeatability Mention low cost of sample preperation

Monatomic Asphalt Overlay Testing

Monatomic Asphalt Overlay Testing Strength (lbs) Displacement (inches)

Monatomic Asphalt Overlay Testing

Specifications Performance Based Specifications

Design Assistance

Updates Installation – Important - Certification?

Questions