Gerald Byrne Director MCIHT, MIAT · Reduction in asphalt thickness, in some circumstances, saving...
Transcript of Gerald Byrne Director MCIHT, MIAT · Reduction in asphalt thickness, in some circumstances, saving...
Gerald Byrne DirectorMCIHT, MIAT.
Agenda
• Uses for Reinforcement/Benefits• Cracking mechanisms• Raw Materials for asphalt reinforcement/Laboratory testing• Open Aperture Composite Reinforcement systems• Design/Placement • RSTA/ADEPT Code of Practice/Installation • Case Studies A45 Performance• Reinforcement with HBM Recycled Base • Specification checklist
Uses for Glasgrid
To reinforce shallow overlays e.g. to allow tar bound layers/granite setts to remain in situ saving on disposal charges .
To reinforce carriageway widening schemes where new carriageway meets existing.
To delay crack formation in overlays / inlays of flex composite pavements .
To delay crack formation in asphalt overlays of in situ recycling systems with high movement /fast draining foundations.
To strengthen micro surfacing systems /surface dressing.
Benefits of Interlayers
Maintenance cost reduction.
Extending road surface life up to 4 times over conventional surfacing.
Reduction in asphalt thickness, in some circumstances, saving on raw material cost .
Prevents surface water ingress – avoiding freeze/thaw effects.
Environmental impact associated with longer maintenance intervals.
Reduced hidden costs to businesses and the general public through delays caused by road closure and traffic restrictions.
Cracking
• Cracking
- The remaining key distress type not accounted for in standard pavement design can significantly reduce structural life
The problem
Effective solutions increase the tensile and shearcharacteristics of asphaltic concrete to overcome
crack associated stresses
Reinforcement systems
Polymer coating
• Our traditional GlasGrid® 8501 or 8511 with improved coating formulation impregnating the fibres in each rib.
Open aperture systems
• GlasGrid® - a self-adhesive recyclable product for road system
GlasGrid®
CompoGrid®
Calibrated Spray Tankers 160/220pen
New Acmar Spray Tanker March 2015
Polymer Bondcoats
Sealoflex Polymer Bondcoat
Polymer Bondcoats
Arcdeso
• Anti reflective cracking design software
Design input sheet
Placement of self-adhesive grid
40mm Surface Course
Binder Course
Regulating
Existing Layer
Place reinforcement on a level smooth surface
Placement of CompoGrid®
Surface Course
Binder Course
Existing Layer
Place reinforcement on a planed surface 10mm peak to trough
Placement
Surface Course minimum 50mm compacted thickness
Binder Course or existing
Existing Layer
Reinforcement
Surface Dressing, Slurry Seal, Micro Asphalt
RSTA/ADEPT Code of Practice
• Manufacture• Design• Installation • Evidence of Performance• Conclusions and Recommendations
NHSS Training
•Provides an industry benchmark and basis for continuous improvement•Focus on quality as an objective – BSEN ISO 9001•Aims to reduce overall costs for the client and supplier •Properly trained and competent workforce •Involves all sides of the industry in scheme ownership•Ensures Certification Bodies use auditors with technical knowledge and experience of the sector concerned
Installation
Correct Installation ?
Installation M69
Adhesion to Base Layer
8~15 cm
7-13 kg
On-site adhesion validation
A45 Great Billing crack free after 6 years
Fatigue testing
• Mechanical performance
No reinforcement0h 51m
100kN/m GlasGrid®2h 40m
100kN/m GlasGrid® pmb5h 30m
In Situ Recycled layer
Installed Compogrid Jacques Bank
Installed Compogrid Bishopsgate
Wellesley rd Croydon
Wellesley rd Croydon
Specification checklist
• Compliance with RSTA/ADEPT code of practice.• Installation by ISO 9001 accredited installer.• Operatives trained to NHSS 13 .• Evidence of in service performance.• Correct grade and application rate bond coat (CompoGrid®).• Coated/uncoated glass fibre system.• Overlay thickness requirements.• Generic specifications (available from ARS Ltd).
A cracking answer to a cracking problem