ROAD PAVEMENT RESEARCH ADVISORY COMMITTEE BMJA Verhaeghe 12 MAY 2005 NINTH MEETING OF THE ROAD...

ROAD PAVEMENT RESEARCH ROAD PAVEMENT RESEARCH ADVISORY COMMITTEEADVISORY COMMITTEE

BMJA VerhaegheBMJA Verhaeghe

12 MAY 200512 MAY 2005

NINTH MEETING OF THE ROAD PAVEMENTS FORUM (RPF)NINTH MEETING OF THE ROAD PAVEMENTS FORUM (RPF)

Resolution #6 (Nov’04)

• The Pavement Research Advisory Committee (PRAC) to provide feedback at the next RPF on the outcomes of the needs determination process as well as on the research themes that have been identified

• Background– Purpose & Structure

• Prioritisation of research needs– Synthesis of research needs – Prioritisation process

• Way Ahead

• Discussion

Presentation outline

Background: Purpose

• To identify, prioritise and execute R&D programmes, projects and activities that:– Address the road infrastructure needs of SA– Enhance socio-economic impact– Promote sustainable development– Support asset preservation– Enhance SA’s industry competitiveness– Support the interests of the industry’s stakeholders– Position SA to address current needs and future

challenges in road provision and maintenance

Background: Structure (1)

• RAC– Advise on R&D needs &

priorities– Assist in technology

foresight studies– Advise on development

of strategic plans & research portfolio plans

– Assist in the review of outcomes

– Assist in assessing the impact of R&D activities

Research Advisory Committee

Management Committee

Secretariat

Focus Area 1 Focus Area 2 Focus Area 3

PMG 1

Project 1Project 2…….

PMG 1


PMG 1


Etc…

Present members of RAC:– ASPASA– Asphalt Academy– C&CI– CIDB– CSIR– DoT– Gautrans– Jeffares & Green– KZN DoT– Limpopo Roads Agency– PD Naidoo

– RBPM– Sabita– SAFCEC– SANRAL– Tshwane University of

technology– University of Pretoria– University of Stellenbosch– Vela VKE– Western Cape DoT– Women in Construction



• Manco– Select projects to be

financed by sponsors– Request & approve

project plans– Source & provide funding– Appoint champions &

teams– Provide management

resources– Output quality review– Ensure effective

technology transfer

Research Advisory Committee

Management Committee

Secretariat

Focus Area 1 Focus Area 2 Focus Area 3

PMG 1


PMG 1


PMG 1


Etc…

Prioritisation of R&D Needs

• Broad areas of research (RAC, Jan ‘05)• Identification & classification of research needs

(Feb-Mar ‘05)• Prioritisation of research needs

– Feedback received from RAC members– Department of Transport & SANRAL– APT Steering Committee– Road Materials Committee– CAPSA ‘04

• Verification & validation of identified research needs– RAC meeting of 5 May ‘05– RPF meeting of 11-12 May ‘05

Prioritisation of R&D needs

• 225 Research needs identified:– Infrastructure Engineering (137)– Infrastructure Delivery (38)– Environment (22)– Planning & Operations (14)– Policy, Economics & Decision Support (10)– Resources (4)

Needs in Infrastructure Engineering

6%

43%

24%

16%

11%

Traffic & Climate

Materials

Pavement Design

Road Furniture &Structures

Asset Management

137 Identified Research Needs137 Identified Research Needs

Needs in Infrastructure Delivery

38 Identified Research Needs38 Identified Research Needs

11%

21%

23%13%

21%

11%Labour-IntensiveConstruction

ConventionalConstruction

Maintenance

QC & QA

ContractingSystems

Safety of RoadWorkers

Tentative Priorities

• Priority A-rating– Thin bituminous surfacings– Foamed-bitumen & bitumen-emulsion treated

materials– Structural design & performance– Gravel roads & upgrading to paved standards– Traffic loading & contact stresses– Design of hot-mix asphalt– Thin- & ultra-thin concrete layers– Suitable replacements for tar-based products


• Priority B-rating– Performance-based specifications for bituminous

binders– Lime- and cement-stabilised materials– Structural design of concrete pavements– Unbound materials– Pavement surveillance equipment– Cold-mix asphalt– Performance-based specifications for

maintenance


• Priority C-rating– Quality control & quality assurance– Impact of climate– Long-life pavements

Priority-A research needs

0.0% 2.0% 4.0% 6.0% 8.0% 10.0% 12.0% 14.0% 16.0%

Structural design &performance

Thin bituminous surfacings

Gravel roads / upgrading

Cold bituminous treatments(structural layers)

Re

se

arc

h N

ee

ds

Ratings

Academia/Research Consulting Engineers Road Owners TOTAL

FBT & EBT treated materials (A1)

• Laboratory simulation of curing• Revision of structural design guidelines

– Development of database on field performance– “Effective stiffness” concept– Role of active fillers

• Revision of TG2 & finalisation of sister document for emulsion-treated materials

• Standard specifications for cold in-place recycling

Gravel roads & their upgrading (A2)

• Gravel roads– Improved deterioration models– Review of specifications for gravel wearing courses– Revision of TRH20– Implementation of certification process

• Upgrading to paved standards– Cost-effective ways to upgrade gravel roads– Geometric standards– Minimum strength criteria for light pavements– Labour-intensive construction & maintenance– Validation of SADC LVSR guidelines for SA

conditions

Thin bituminous surfacings (A3)

• Surface dressings– Concept of elv & better guidance on design for

heavy traffic volumes– Modified binders (applicability of design charts)– Database on long-term performance of seals

• Thin-layer asphalt– Guidelines on their design and use– Fit-for-purpose certification system for non-

conventional products

• Cost-effectiveness of modified binders• Adhesion & bonding to substrata

Structural design & performance (A4)

• Upgrading of SAMDM• Incorporation of input variability & probabilistic

functions in structural design methods• Integration of all mechanistic design methods

(flexible & rigid) into one method• Structural design & analysis system

accommodating non-uniform contact stresses and dynamic loading

• Revision of TRH4 (including incorporation of rigid pavements)

• Revision of TRH12

Priority-A research needs

0.0% 2.0% 4.0% 6.0% 8.0% 10.0% 12.0% 14.0% 16.0%

Structural design &performance

Thin bituminous surfacings

Gravel roads / upgrading

Cold bituminous treatments(structural layers)

Re

se

arc

h N

ee

ds

Ratings


Priority-B research needs

0.0% 2.0% 4.0% 6.0% 8.0% 10.0% 12.0% 14.0% 16.0%

Hot-mix asphalt

Lime- & cement-treatedmaterials

Thin concrete layers

Quality control & assurance

Re

se

arc

h N

ee

ds

Ratings


Quality control/assurance (B1)

• Survey of factors and influencing issues impacting on quality, and the provision of remedial solutions

• High-speed, non-destructive testing procedures & automated systems for the monitoring & control of construction quality

• Revision of standards & specification• Capacity building

Thin concrete layers (B1)

• Design and performance– Engineering properties and load carrying capacity

of thin & ultra-thin concrete layers– APT study of high-strength thin concrete overlays– Guidelines on design & use of thin & ultra-thin

concrete layers

• Construction– Guidelines on the construction of thin & ultra-thin

concrete layers using both conventional & labour-intensive methods

Lime- and cement-treated materials (B3)

• Test methods & specifications for the assessment of durability and erosion resistance

• Ways to improve the working time associated with the new range of cements

• Appropriate construction methods• Calibration of resilient & performance models

incorporating variability

Hot-mix asphalt (B4)

• Validation of interim design guidelines– Forensic, LTPP & APT studies– Reliable test procedures & acceptance criteria for

rutting, durability & fatigue– Concept of aggregate packing and spatial

composition– Laboratory mix preparation, conditioning &

compaction– Design procedures for SMA

• Stability of mixes at intersections• Revision of TRH8• Standards & specifications

Priority-B research needs

0.0% 2.0% 4.0% 6.0% 8.0% 10.0% 12.0% 14.0% 16.0%

Hot-mix asphalt

Lime- & cement-treatedmaterials

Thin concrete layers

Quality control & assurance

Re

se

arc

h N

ee

ds

Ratings


Priority-C research needs

0.0% 2.0% 4.0% 6.0% 8.0% 10.0% 12.0% 14.0% 16.0%

Long-life pavements

Tar-based products

Material classification(unbound)

Perf. specs for bituminousbinders

Traffic loading & contactstresses

Re

se

arc

h N

ee

ds

Ratings


Traffic loading & contact stresses (C1)

• Traffic loading– Accuracy of WIM measurements– Updating of ESALS per heavy vehicle factors– Investigation/enhancement of ESAL/E80 concept– Revision of TRH16

• Non-uniform contact stresses– Quantification of effects of contact stresses on

behaviour & performance of upper pavement layers

– Integration of non-uniform contact stresses is structural design systems

Bitumen specification & Material classification

• Performance-based specifications for bituminous binders (C2)– As directed by the RPF working group

• Material classification (C3)– Improved characterisation methods for unbound

materials, weathered gravels and soils– Improved design models (e.g. resilient & plastic

deformation models)– Revision of TRH14

Tar replacement & Long-life pavements

• Tar replacement (C4)– Investigation into suitable replacements for coal

tar for priming, pre-coating of aggregates and other applications in road construction

• Long-life pavements (C5)– Concept development & economic viability of long-

life pavements– Survey of long-life pavements– Strategy for long-life pavements– Construction & materials for long-life pavements– Guidelines for design, construction and

maintenance of long-life pavements

Structural materialsCold bituminous treatment (A)

Thin-layer concrete (B)Lime/cement stabilised materials (B)

Hot-mix asphalt (B)Material classification (C)

Operational environmentTraffic loading & contact stresses (C)

Structural design offlexible & rigid pavements (A)

Long-life pavements (C)

Construction & MaintenanceGravel roads & their upgrading (A)

Thin bituminous surfacings (A)Quality control/assurance (B)

Replacement of tar-based products (C)

Perf-based specsfor bituminous

Binders (C)

Way Forward

• Focus area groups to unpack the needs identified & identify projects

• Need to relate the outcomes of the focus areas to strategic objectives of transport and national imperatives

Unpacking of needs

Volum etrics C om paction

G rading op tim isatio nP redictio n o f

e ngineeringproperties

Lab oratory C om pac tio nm etho ds

Fie ld c om pactio npred ictio n

Fie ld c om pactio nm etho ds

(see C o nstruc tio n p latform )

T ransfer Functions

Loa d se nsitivity a nalysisM ois ture se nsitivity

a nalysisD e nsity m eas urem e nts

a nd predictio nS tiffness calc ula tio n

a nd predictio nS hear m eas urem ent

a nd predictio n

Engineering Properties

Tra nsfer func tio nde velo pm e nt

L ink to s tructura ldesig n

LTP PAP T

Triaxia l testing e q uipm e ntC om pactio n pred ictio n m o dels a nd s oftw areS ta ndard e q uipm e nt

DESIGN OF UNBOUND MATERIALS

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Unpacking of needs

Traffic Loading Analysis

Environ-mental

Analysis

Construction variability

Analysis methods

Link to Materials Design

Selection and

Decision Support

Perfor-mance

Prediction

Tyre co ntact s tressTyre tem peraturesAxle loadingO verloa dingTraffic c haracterisatio n .V ehic le dy nam ics

Tem perature req uirem ents

M ois tureG eolo gy &

s ub gradesE nviro nm e ntal

im pact

M etho dsQ A/Q CS tds & S pec

B ackcalc ulatio nForw ard

calc ulatio nFinite E lem ent

a nalysisM o deling

tec hniq uesD y nam ic

a nalysisP robabilis ticsR eliab ility

Tra nsferfunctio ns

M ateria ls c haracterisatio n

& properties

L ife cy cle costing & econom icanalysis

Selection criteria

O ptim ization p rocedures

D atabase a nalysis

S tatis ticsM o dellingTra nsfer functio ns

3-D S tress S ensorW IM S ystemS oftw are packages / P rogram m esV arious fie ld eq uipm entP erform ance databases

PAVEMENT STRUCTURAL DESIGN METHODS

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P riority A ,B ,C

P riority A

P riority C P riority D P riority B

Unpacking of needs: Priority A

• Cold bituminous treatments– RPF Working Group

• Gravel roads & their upgrading– (Les Sampson & Phil Paige-Green to convene)

• Thin bituminous surfacings– (Expansion of ASA Task Team)

• Structural design & performance– RPF Working Group

Unpacking of needs: Priority B

• Quality control & quality assurance– ?

• Thin concrete layers– (Rudi Kühn & Bryan Perrie to convene)

• Lime- & cement-treated materials– RPF Working Group

• Hot-mix asphalt– (HMA PMG or APT Task Group)

Unpacking of needs: Priority C

• Traffic loading & contact stresses– (Morris de Beer & PW de Bruin to convene)

• Performance specs for bituminous binders– RPF Working Group

• Material classification– (Dennis Rossmann & Hechter Theyse to convene)

• Replacement of tar-based products– (Sabita to convene)

• Long-life pavements– (SA PIARC representatives to convene)

Way Forward

• Alignment with strategic objectives for transport– Role in economic development– Safety and personal security– Increasing access and mobility– Public health issues– Environmental sustainability– Human resource development– Poverty alleviation / job creation

• Compilation of Research Master Plan– Focus area groups to unpack the needs identified &

identify projects (end July 2005)– Translate the outcomes of the focus areas to strategic

objectives of transport and national imperatives (May’05)

– Secretariat to compile Research Master Plan (Aug’05)– Circulate to members of PRAC for comments (Aug’05)

• Meeting of the Management Committee (September 2005)

WAY AHEAD

ROAD PAVEMENT RESEARCH ADVISORY COMMITTEE BMJA Verhaeghe 12 MAY 2005 NINTH MEETING OF THE ROAD...

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