1. Document Development for Metro Project: Performance-based Procurement Asphalt Overlay for Programmed Maintenance
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2. Consistent with Strategic Alliance
Alliance Project Number 1.1 “Performance Based Specifications (and delivery systems)”
Purpose is to:
Provide MR with reduced risk and increased confidence in asphalt performance
Cost effective alternatives to risk reduction for underperforming solutions
Transfer to long term performance to supplier to result in savings from reduced auditing and surveillance
Improve supplier capability and innovation
Clear definition of functional performance and durability requirements
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3. Surfacings innovation framework
Function and
Performance Properties
Review and Systemisation
Contract Provisions
Specifications and
Test Methods
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4. Types of asphalt
4 Types
Type A
Type B1
Type B2
Type C
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5. Type A
Type A asphalt:
be applied using a purpose built or adapted asphalt paver capable of applying a sprayed bituminous bond coat and asphalt in a single operation;
have a nominal thickness of less than 20 mm;
have a life greater than 6 years in a heavily trafficked urban environment when placed on a sound pavement; and
when compacted, at the time placement, be free draining.
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6. Type B1
Type B1 asphalt:
be a thin stone mastic style surfacing asphalt;
have a life greater than 10 years in a heavily trafficked urban environment when placed on a sound pavement; and
when compacted, at the time placement, be moderately free draining.
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7. Type B2
Type B2 asphalt:
be a thin stone mastic surfacing style asphalt;
have a life greater than 15 years in a heavily trafficked urban environment when placed on a sound pavement; and
when compacted, at the time placement, be relatively impermeable.
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8. Type C Type C asphalt: be an open graded style surfacing;
have a life greater than 8 years in a heavily trafficked urban environment when placed on a sound pavement; and
when compacted, at the time placement, be free draining.
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9. Documents Developed For use in Minor Works contract:
Project Specification and Annexure
Supp Conditions of Tender and “Form 1”
Supp Conditions of Contract
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10. Supp Conditions of Tender
statement that existing pavement (with agreed pavement repairs) are sufficient for the Surfacing System to perform adequately
statement nominating any additional quantities of pavement repair
completion of the requirements including all required attachments of Form 1
documented evidence of two projects where the Surfacing System has achieved satisfactory performance over at least 5 years
Scoring: 40% to non price criteria
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11. Non Price Criteria
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12. Non Price Criteria - Cl 5 of Form 1
Functional Property (refer Clause 5 of Form 1)
Texture depth at installation
Texture depth after 2 years of trafficking in a heavily trafficked urban environment
PAFV of coarse aggregate
Wheel tracking
Fatigue
Permeability
Stripping
Bond Strength
Skid resistance at installation
Skid resistance after 2 years trafficking in a heavily trafficked urban environment
Noise
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13. Form 1
Introduction
Pavement Repairs and Shape Correction and Preparation of Substrate
Bond Coat
Surfacing Asphalt Mix
Functional Properties of the Surfacing System
Manufacture Storage and Transportation
Personnel
Equipment
Inspection and Test Plan
Construction procedures
Proprietary Product Details
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14. Supp Conditions of Contract
The defect liability period after the date Practical Completion consists of 2 parts being:
An initial 90 day defect liability period; and
A 2 year extended defect liability period concurrent with and additional to the initial 90 day defect liability period.
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15. Security
“The Contractor shall provide a security, and the Principal has recourse to that security, in accordance with Clause 3 of the Minor works contract conditions (AS ) except that the Principal's entitlement to the security upon the issue of the Certificate of Practical Completion is 5% of the cost of The Surfacing (as measured under the schedule of quantities) for the performance of The Surfacing during the defect liability period.”
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16. Exclusions
The Contractor not liable for damage to The Surfacing resulting from “external" sources, including but not limited to:
Traffic accidents;
Spillage of hazardous materials;
Materials falling off vehicles;
Travelling of tracked plant (other than the Contractor's) after the date of Practical Completion; and
Overtopping of the road surface with water as a result of flooding.
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17. Rectification
During the defect liability period, in addition to the requirements of Clause 21 of the Minor works contract conditions (AS ), defective work shall be rectified as follows:
Cooperation, allocation of costs, time periods
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18. Specification and Annexure
Details requirements of and provides information for:
repair and shape correction of existing pavement substrate;
site acceptance prior to construction;
the Surfacing System including substrate preparation, bond coat and the Surfacing asphalt;
production and placement trial;
construction; and
conformance of the Surfacing System at completion of installation, practical completion and final completion.
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19. Specification and Annexure
Details the minimum requirements for:
Inspection and test plan
Principal’s selection of surfacing type (A, B1, B2, C)
Mix design:
Minimum requirements for durability (binder volume), fatigue resistance (or binder type) and sealing of the underlying pavement
No specified requirement for air voids, grading or compaction
TMR considers this an appropriate level of responsibility transfer given the defects period is only 2 years and not the life of the surfacing
Weather conditions
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20. Performance at Installation
A Visual Assessment Test in accordance with Clause may be ordered by the Superintendent and the Visual Assessment Panel shall assess the Surfacing System for the following defects:
Deformation, Potholes, delamination, Surface cracking, Surface ravelling, Bleeding (flushing), Stripping
Deviation from Straight Edge
Surface Evenness
Layer Thickness
Texture Depth
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21. Performance during Defect Period
A Visual Assessment Test in accordance with Clause may be ordered by the Superintendent and the Visual Assessment Panel shall assess the Surfacing System for the following defects:
Deformation, Potholes, delamination, Surface cracking, Surface ravelling, Bleeding (flushing), Stripping
Deviation from Straight Edge
Texture Depth
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22. Conformance
Compliance with the Contractors own procedures per Form 1 and contract agreements with some provisions for reduced level of service
Contract documents detail conformance of the Surfacing System at installation, practical completion and final completion.
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23. Conformance Compliance with documents
Compliance focussed on Works complying with Contractor’s own procedures and mix properties as defined in the Form 1
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