tmr pavement design supplement - aapa q · tmr pavement design supplement aapa bituminous surfacing...

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TMR Pavement Design Supplement AAPA Bituminous Surfacing - Principles & Practice course: Fundamentals of flexible pavement design

Michael Pickering, Director (Pavements, Research and Innovation) | 21 August 2014

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We connect Queenslanders…

PDS and harmonised asphalt spec | 29 May 2014

•  We get people and industry moving

•  We plan, we invest

•  We deliver, we manage

•  We regulate

•  We help, we educate

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We deliver, we manage

PDS and harmonised asphalt spec | 29 May 2014

We plan, we invest

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Outline

•  Drivers •  Using it •  Development and consultation •  Key content •  Typical outcomes (2013 versus 2009)

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Transport and Main Roads’ Pavement Design Supplement (PDS)

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1922

Source: MR Board First Annual Report, 1922

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Drivers for review

Flexibility Alignment with Austroads

Supplement Linkages

Value for money

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Overall style has changed – less prescriptive

•  No gold plating •  Value-for-money •  ‘Re-engineer the regions’.

Transport and Main Roads environment

•  Ensuring affordable fit-for purpose solutions by reviewing our current processes and standards

•  Empowering our people to develop innovative solutions.

Infrastructure Management & Delivery (IMD)

priorities

•  From regions was that the previous Pavement Design Manual was too prescriptive.

Feedback

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How to use the PDS

Read both together

Transport and Main Roads adopts the national standards of Austroads, as per AGPT02 (2012).

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How to use the PDS

AGPT02

PDS

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How to use the PDS

Additional sections, tables, figures, equations

Start with prefix Q

Examples in the PDS

•  Section Q2.4 Shoulders with a lower structural standard •  Table Q2.1 Guide to the selection of pavement types •  Equation Q6.1 (adjusting moduli for WMAPT).

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How to use the PDS

•  •  •  •  •  •  •  • 

•  •  • 

AGPT02

PDS

Includes a range of strategies

Includes additional strategies PDS | 21 August 2014

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Development process

Transport and Main Roads Value-for-money review

ARRB Stakeholders

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Key content

Some of the major

changes since 2009

Background and

technical basis

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Pavement design period

Road Category Proposed Design Period (Years)

Motorways, busways and arterials

30

Sub-arterials and Priority One Roads1

20

All other roads 10 1 State Controlled Priority Road Network Investment Guidelines (June, 2011)

AADT (two directions)

Adopted Design Period (Years)

≥ 30,000 30

< 30,000 20

Initial proposal

0

10

20

30

40

50

60

Construction Cost Maintenance Cost Salvage Value Total Whole-of-lifeCost

Dis

coun

ted

$/m

2

20 year design period

10 year design periodConsultation WOLC

Adopted

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Project reliability

Road Category Minimum Reliability

(%) Motorways, highways and main roads with lane AADT

> 2000 97.5

Highways and main roads with lane AADT > 500 and

≤ 2000 95

Minor roads with lane AADT ≤ 500 90 Road Category

Typical Reliability

(%)

Freeways (Motorways) 95

All other roads (includes highways and main roads)

90

2009 Manual

2013 PDS

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Section 2.2 Pavement types

Previously PDM had minimum pavement

standards

PDS has a guide to selection, to be used in conjunction with

local experience, and project-specific requirements

PDM = Pavement Design Manual (TMR 2009) PDS = Pavement Design Supplement (TMR 2013)

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Common pavement types

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Example

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Surfacing selection

Part 3: Pavement Surfacings of the Austroads Guide to Pavement Technology (Austroads, 2009)

Update of Double / Double Design for Austroads Sprayed Seal Method, AP-T236-13 (Austroads, 2013)

Update of the Austroads Sprayed Seal Design Method, AP-T68-06 (Austroads, 2006)

Plus project-specific requirements

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Subgrade - Moisture conditions

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Section 6.2 Selecting unbound materials

Table Q6.1 – Typical application of standard materials (MRTS05 Type) in sealed unbound granular pavements

Average daily traffic in design lane in year of opening (ESA)

Typical Material Type 2, 3

Median Annual Rainfall (mm)

≥ 800 mm / year ≥ 500 mm/year to < 800 mm/year < 500 mm/year

Base

≥ 1000 to < 3000 HSG1 HSG1 HSG1

≥ 100 to < 1000 2.1 or 1.1 2.1 or 3.1 3.1

≥ 10 to < 100 2.1 2.1 or 3.1 3.1

< 10 2.2 2.2 or 3.2 3.2

Upper Subbase

≥ 1000 to < 3000 1.2 or 2.3 2.3 or 2.4 2.3, 2.4, 3.3 or 3.4

≥ 100 to < 1000 2.3 2.3, 2.4, 3.3 or 3.4 3.3 or 3.4

< 100 2.4 2.4 or 3.4 3.4

Lower Subbase

All 2.5 2.5 or 3.5 3.5

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Section 6.3 Modified materials

•  Notes differences between AGPT02 definition and Transport and Main Roads usage

•  Provides general guidance and caters for local region requirements

•  Reference to Transport and Main Roads report for further guidance on design methodology and project-specific technical standard.

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Section 8 Flexible pavements

Plant-mix foamed bitumen

•  Refer to Transport and Main Roads Pavement Rehab Manual

Lime stabilised subgrade

•  Refer to Transport and Main Roads Technical Note 74

Post cracked life of cemented subbase can be included

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Table Q6.7 Selection of DG binder

Table Q6.7 – Guide to the selection of dense graded asphalt binders

Application Traffic Conditions (average daily ESA in design lane in

year of opening) Typical Binders Free Flowing High Shear1

Surfacing

< 1000 < 300 C320 2, 3

1000 to < 3000 300 to < 1000 A5S 2

≥ 3000 ≥ 1000 A5S 4

Intermediate course

< 1000 < 300 C320 2, 3

1000 to < 3000 300 to < 1000 A5S 5

≥ 3000 ≥ 1000 A5S 4

Base course All < 3000 C320, C600 2

All ≥ 3000 6 C600 2

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3.7 Waterproofing seals

DG7, DG10

92.0%

SM10, DG14, DG20, DG28

93.0%

SM14

94.0%

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PDS 2013 Presumptive modulus

Mix Type Binder Binder Volume

Asphalt modulus at heavy vehicle operation speed (MPa)

10 km/h 30 km/h 50km/h 80 km/h OG10/14 A5S N/A 800 800 800 800

SM14 A5S 13 1000* (600)

1000* (900) 1100 1300

DG10 C320 11.5 1000* (900) 1300 1600 1900

DG10 A5S 11.5 1000* (600)

1000* (800) 1000 1200

DG14 C320 11 1100 1700 2000 2400 DG14 C600 11 1400 2000 2400 2900

DG14/HP/HS A5S 11 1000* (700) 1000 1300 1500

DG20 C320 10.5 1200 1800 2200 2600 DG20/HM C600 10.5 1500 2200 2600 3100

DG28 C320 10 1200 1800 2200 2600 DG28 C600 10 1500 2200 2600 3100

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Cost savings – Motorway example

AADT 80,000

PDM 2009

PDS 2013

Design life 40 years

Design life 30 years

Project reliability 97.5%

Project reliability

95%

HV 12%

DESA 3.28E+08

DESA 1.93E+08

CBR 5%

Subgrade treatment?

No

Subgrade treatment?

No

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Cost savings – Motorway example using full depth asphalt

OG 14 S4.5S

DG 14 HS

Surfacing Seal

Intermediate course

Improved Layer (Working Platform)

40 mm Yes

50 mm

PDM 2009 40 mm

Yes 50 mm

PDS 2013

Prime & Seal

DG20HM

Base course

375 mm

310 mm

Type 2.3 150 mm (cemented)

150 mm (cemented/ unbound)

Prime + C170 Yes Yes / No

$280k Asphalt

(1 km)

$60k Seals

(potential)

$340k Saving (potential)

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Fact sheet

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Project specific requirements

•  Define project-specific requirements. Project brief

•  More detailed brief for some contract types, e.g. D and C, developments.

Contract type

•  The brief should detail how design exceptions/departures are to be considered.

Design exceptions/ departures

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Design exceptions/departures and innovations

Open for consideration

Risks and benefits

Risk management

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Innovation Assessment Checklist

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Austroads TMR/ARRB

Industry Your feedback

What next?

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Pavements Research and Innovation

•  Technical specifications including unbound granular materials, bitumen, sealing, asphalt and concrete

•  Project specific technical specifications such as SMA, cement modified base, high standard granular and subgrade

•  Guide notes, test methods and approved product lists •  Pavement Design Supplement •  Specialist technical advice •  Peer review •  Innovation assessment •  TMR/ARRB research •  Austroads •  Registration of asphalt suppliers and mixes •  Technical training.

What we do

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Pavements Research and Innovation

• Overarching and general enquiries • Austroads Pavements Task Force.

Mike Pickering, Director (Pavements, Research and

Innovation), 3066 7741

• Pavement design • Concrete pavements • Cement modified pavements.

Peter Bryant, Principal Engineer (Pavement Design), 3066 7743

• Unbound pavement materials • Recycled materials • Heavy vehicles.

Narelle Dobson, Principal Engineer (Pavements and Materials Development), 3066 7742

• Asphalt • Seals • Surfacings.

Jason Jones, Principal Engineer (Asphalt and Surfacings),

3066 7726

• Asphalt supplier and mix design registration • Bitumen and binders • Pre-coating and anti-stripping (adhesion) agents.

Barry Rule, Principal Advisor (Materials Testing), 3066 7719

• Mechanical engineering • Austroads Technology Program Manager.

John Spathonis, Principal Manager (Research and Development),

3066 6465 PDS | 21 August 2014

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Thank you