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