G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS 1 GAUTRANS APT ELZBIETA SADZIK MAY 2002

SPECIFICATIONS 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 passes / 24h Maximum passes / 24h Random (user- definable) wandering pattern Fixed wandering pattern

G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS 3 COST BENEFIT: HVS III vs HVS IV 57% Decrease in total production cost  50 % Increase in production  19% Decrease in Fuel consumption  56% Decrease in down time

G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS 4 Comparative Cost: HVS III vs HVS IV HVS Mk III: 80 cents/load repetition HVS Mk IV+: 50 cents/load repetition

HVS testing sites

Testing subjects Road No. Test topicOutputInfo dissemination S702Low-volume roads  Performance rating of various surface treatments 1 st & 2 nd level analysis reports D2388Labour- intensive construction  Cost-benefit rating  WM guideline  ETB struct. design for Sabita Manual 21 Seminar & site visit for local road authorities WM seminar – October 2000 N1 P243/1Deep in situ recycling FB guideline  Behaviour model  Material class.  ME design method Workshop – Jan ‘01 Workshop – April ‘02 Seminars – June ‘02

G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS 7 HVS accompanied tests Laboratory  Standard 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)

G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS 8 HVS accompanied tests Field  HVS  Material characterisation  Field moisture and density, environmental data  Dynamic Cone Penetrometer (DCP)  Deflection, permanent deformation and rut  LTPP  Visual evaluation  Deflections  Traffic survey

G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS 9 Test matrix for foam-treated material Recycled material Active filler content Binder content NoneLow (0,5 – 2 %) Intermediate (2 – 4 %) High (4 – 6 %) Recycled CTB with foamed bitumen treatment (P243/1) NoneStd 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

G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS 10 Test matrix for emulsion-treated material Recycled material Active filler content Binder content NoneLow (0,5 – 2 %) Intermediate (2 – 4 %) High (4 – 6 %) Recycled CTB with emulsion treatment (P243/1) NoneStd 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 management Steering Committee Technical management Needs Scope Prioritisation Technical panel Proposals Reports Guidelines Review Pool

G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS 12 Issues 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 objective  Ad hoc needs (proof testing)

G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS 13 “Steering Committee” identified needs Cold-mix recycling Rut-resistant solutions Ultra-thin & thin concrete layers Appropriate asphalt overlays & seals New cement / high UCS layers

G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS 14 “Steering Committee” identified needs Composite pavements Cost-effective solutions for low- volume roads Risk assessment & management Vehicle-pavement interaction

G AUTRANS DEPARTMENT OF PUBLIC TRANSPORT, ROADS & WORKS 15 Proposal It is proposed that an APT Steering Committee be established as a sub-committee of the RPF