1. 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

2. Content Applications Current Interlayer Product Range
Recent Testing Data
Specifications
Questions

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

4. 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

5. Products (Existing) GlasGrid GlasPave GlasGrid 8501 GlasPave25

6. Applications
Updated Product Selection Guide:

7. Testing
NCSU Results
Plate Load Testing
TTI Overlay Testing

8. 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

9. 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

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

11. Plate Load Testing

12. 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

13. Monatomic Asphalt Overlay Testing
Overlay Tester
Typical Sample

14. 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

15. Monatomic Asphalt Overlay Testing

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

17. Monatomic Asphalt Overlay Testing

18. Specifications
Performance Based Specifications

19. Design Assistance

20. Updates
Installation – Important - Certification?

21. Questions