kim jenkins sanral chair in pavement eng university of stellenbosch, south africa
DESCRIPTION
TRB INTERNATIONAL ACTIVITIES COMMITTEE. South African Activities - Highlights for 2007. Kim Jenkins SANRAL Chair in Pavement Eng University of Stellenbosch, South Africa. TRH 3 (2007). Scope of the document. Background to sealwork Investigation & seal type selection Pre-treatment - PowerPoint PPT PresentationTRANSCRIPT
1
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
2
Creating Wealth
Through Infrastruct
ure
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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Creating Wealth
Through Infrastruct
ure
Ultra Thin Continuously Reinforced Concrete Pavement
(UTCRCP)
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Creating Wealth
Through Infrastruct
ure
Ultrathin continuously reinforced concrete pavement (UTCRCP)
• cncPave being updated to include UTCRCP
- 2007
5
Creating Wealth
Through Infrastruct
ure
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
6
Creating Wealth
Through Infrastruct
ure
Current and Future APT Focus areas
Vehicle-pavement interaction – SIM TM
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Creating Wealth
Through Infrastruct
ure
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