g autrans department of public transport, roads & works 1 gautrans apt elzbieta sadzik may 2002
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G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS
GAUTRANS APTGAUTRANS APT
ELZBIETA SADZIK
MAY 2002
SPECIFICATIONS FOR HVS MARK III AND MARK IVSPECIFICATIONS FOR HVS MARK III AND MARK IV
HVS Mark IV+ HVS Mark III
Moving Constant (30 – 205 kN) and Dynamic Loads (mean dynamic load 36 – 88 kN)
Only Moving Constant Loads (30 – 200 kN)
Maximum 32 000 passes / 24h
Maximum 25 000 passes / 24h
Random (user-definable) wandering pattern
Fixed wandering pattern
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G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS
COST BENEFIT: HVS III vs COST BENEFIT: HVS III vs HVS IVHVS IV
• 57% Decrease in total production cost
50 % Increase in production 19% Decrease in Fuel consumption56% Decrease in down time
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G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS
Comparative Cost: HVS III vs Comparative Cost: HVS III vs HVS IVHVS IV
• HVS Mk III: 80 cents/load repetition
• HVS Mk IV+: 50 cents/load repetition
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S702
D2388
N1
D2388
P243/1
P243/1
HVS testing sitesHVS testing sites
Testing subjectsTesting subjectsRoad No.
Test topic Output Info dissemination
S702 Low-volume roads
Performance rating of various surface treatments
1st & 2nd level analysis reports
D2388 Labour-intensive construction
Cost-benefit rating WM guideline ETB struct. design
for Sabita Manual 21
Seminar & site visit for local road authorities - 1996
WM seminar –
October 2000
N1
P243/1 Deep in situ recycling
FB guideline Behaviour model Material class. ME design method
Workshop – Jan ‘01
Workshop – April ‘02
Seminars – June ‘02
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G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS
HVS accompanied tests HVS accompanied tests
• LaboratoryStandard laboratory
Grading, Atterberg, OMC/MDD (untreated) CBR, UCS, ITS
Advanced laboratory Flexural beam test (FBT) Static and dynamic triaxial (STT and DTT)
Durability Permeability Wheel-tracking erosion (WTE) and mechanical brush
(MBT)
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G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS
HVS accompanied testsHVS accompanied tests
• FieldHVS
Material characterisation Field moisture and density, environmental data Dynamic Cone Penetrometer (DCP) Deflection, permanent deformation and rut
LTPP Visual evaluation Deflections Traffic survey
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G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS
Test matrix for foam-treated Test matrix for foam-treated materialmaterial
Recycled material
Active filler content
Binder content
None Low
(0,5 – 2 %)
Intermediate
(2 – 4 %)
High
(4 – 6 %)
Recycled CTB with foamed bitumen treatment
(P243/1)
None Std lab
Adv Lab
UCS, ITS
FBT
Low
(0,5 – 1,5 %)
UCS, ITS
FBT
UCS, ITS
FBT
Std lab
Adv Lab
Durability
UCS, ITS
FBT
Intermediate
(1,5 – 3,0 %)
UCS, ITS
FBT
Std lab
Adv Lab
Durability
HVS
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G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS
Test matrix forTest matrix foremulsion-treated materialemulsion-treated material
Recycled material
Active filler content
Binder content
None Low
(0,5 – 2 %)
Intermediate
(2 – 4 %)
High
(4 – 6 %)
Recycled CTB with emulsion treatment
(P243/1)
None Std lab
Adv Lab
UCS, ITS
FBT
UCS, ITS
FBT
Low
(0,5 – 1,5 %)
UCS, ITS
FBT
UCS, ITS
FBT
UCS, ITS
FBT Durability
Intermediate
(1,5 – 3,0 %)
UCS, ITS
FBT
Std lab
Adv Lab
Durability
HVS
UCS, ITS
FBT
HVS managementHVS management
Steering Committee
Technical management
NeedsScope
Prioritisation
Technical panel
Proposals Reports Guidelines
Review Pool
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G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS
Issues discussedIssues discussed
• Unanimous agreement on historical benefit of HVS research for pavement engineering in South Africa and a need to continue
• Needs identified:Long-term research objectiveAd hoc needs (proof testing)
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G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS
““Steering Committee” Steering Committee” identified needsidentified needs
• Cold-mix recycling• Rut-resistant solutions• Ultra-thin & thin concrete layers• Appropriate asphalt overlays &
seals• New cement / high UCS layers
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G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS
““Steering Committee” Steering Committee” identified needsidentified needs
• Composite pavements• Cost-effective solutions for low-
volume roads• Risk assessment & management• Vehicle-pavement interaction
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G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS
ProposalProposal
• It is proposed that an APT Steering Committee be established as a sub-committee of the RPF