Creating Wealth Through Infrastructure 1 Kim Jenkins SANRAL Chair in Pavement Eng University of...

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1 Creating Wealth Through Infrastructur e Kim Jenkins SANRAL Chair in Pavement Eng University of Stellenbosch, South Africa South African Activities - Highlights for 2007 TRB INTERNATIONAL ACTIVITIES COMMITTEE

Transcript of Creating Wealth Through Infrastructure 1 Kim Jenkins SANRAL Chair in Pavement Eng University of...

Page 1: Creating Wealth Through Infrastructure 1 Kim Jenkins SANRAL Chair in Pavement Eng University of Stellenbosch, South Africa South African Activities - Highlights.

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Creating Wealth

Through Infrastruct

ure

Kim Jenkins SANRAL Chair in Pavement Eng

University of Stellenbosch, South Africa

South African Activities

- Highlights for 2007

TRB

INTERNATIONAL ACTIVITIES COMMITTEE

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TRH 3 (2007)

• Background to sealwork• Investigation & seal type selection• Pre-treatment• Design

– Conventional and modified binder– Sand seals, Single & Double seals, – Slurry and Cape seals– Fogspray and rejuvenators– Geotextile seals– Graded aggregate seals

• Construction and quality control guidelines• Labour intensive sealing• Maintenance

Scope of the document

double seal

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Ultra Thin Continuously Reinforced Concrete Pavement

(UTCRCP)

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Ultrathin continuously reinforced concrete pavement (UTCRCP)

• cncPave being updated to include UTCRCP

- 2007

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ME-design model– Provides opportunity for design refinement

• Project specific input combined with design expertise

• Utilisation of available road-building material

ME-design core

Trafficloading

Spatial variationof field variables

Axle load

Frequency

Contact stress

Frequency

T1

RD1, S1

1b, 1b

T2

RD2, S2

2b, 2b

T3

RD3, S3

3b, 3b

Tn

RDn, Sn

nb, nb

Layer thicknessTemperatureBinder contentRelative densitySaturationGradingetc.

Pre-processing Post-processing

Extent of fatigue

Time Fatigue life

Frequency

Rut

Time Rut life

Frequency

Terminal rut

Riding quality

Time Riding quality life

Frequency

Unacceptable

Axle load and contact stress histograms are time-dependent

Certain field variables are time-dependent in addition to spatial variability

ME-design core

Trafficloading

Spatial variationof field variables

Axle load

Frequency

Contact stress

Frequency

T1

RD1, S1

1b, 1b

T2

RD2, S2

2b, 2b

T3

RD3, S3

3b, 3b

Tn

RDn, Sn

nb, nb

Layer thicknessTemperatureBinder contentRelative densitySaturationGradingetc.

Pre-processing Post-processing

Extent of fatigue

Time Fatigue life

Frequency

Rut

Time Rut life

Frequency

Terminal rut

Riding quality

Time Riding quality life

Frequency

Unacceptable

Axle load and contact stress histograms are time-dependent

Certain field variables are time-dependent in addition to spatial variability

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Current and Future APT Focus areas

Vehicle-pavement interaction – SIM TM

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Structural Design of CIPR with Cold Mix

LAB

DCP

Visuals

Test Pits

FWD

Materials Classification

Capacity Assessment

Specifications

CBR 7-15%

200 mm BSM 1

130 mm C4

> 200 mm G6

Mix Design• Shear Strength

• Durability

• Flexibility

Adopt aspects of Certainty Theory

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THANK YOU

www.nra.co.za