1

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

Ju

l-9

4

Ja

n-9

5

Au

g-9

5

Fe

b-9

6

Se

p-9

6

Ma

r-9

7

Oc

t-9

7

Ma

y-9

8

No

v-9

8

Ju

n-9

9

De

c-9

9

Ju

l-0

0

Ja

n-0

1

Au

g-0

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Ma

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2

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