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Overview of the CSIR-UCB Research Programme on Road Pavements Initiated in 1994

The CSIR-UCB research programme on road pavements officially commenced in 1994, focusing on advanced highway testing and technology transfer through High-Speed Testing (HVS) systems. The project's early stages included the operation of refurbished HVS Mk IIIs, while later stages emphasized value-added projects in flexible and rigid pavements, post-graduate education, and mechanistic-empirical design. Collaborating organizations, including CALTRANS and Dynatest Inc., have contributed significantly to the advancement of pavement technology and the sharing of South African expertise with international partners.

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Overview of the CSIR-UCB Research Programme on Road Pavements Initiated in 1994

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  1. CSIR-UCB research programme Road Pavements Forum 14 November 2001

  2. Where did it start? • Officially started in 1994 • Sale of two refurbished HVS Mk IIIs • Technology transfer package in addition to sale of HVSs • Initial stages: HVS operation • Later stages: Value addition projects

  3. Organisational structure CALTRANS Tom Hoover PRC of ITS PI: Dr J Harvey University of California, Berkeley Contractor: Dynatest Inc Dr N Coetzee Subcontractor: Transportek, CSIR

  4. Technology transfer CALTRANS Tom Hoover PRC of ITS PI: Dr J Harvey University of California, Berkeley Post-graduate training Contractor: Dynatest Inc Dr N Coetzee Subcontractor: Transportek, CSIR HVS and other value addition projects

  5. Post graduate studies • Masters degrees • Louw du Plessis • Leoni Louw • Jeremy Lea • Ph Ds • Fenella Long • Non-linear visco-elastic modelling of asphalt • Jorge Prozzi • Empirical models of pavement deterioration developed from multiple data sources (near completion) • Andrew Heath • A constitutive model for unbound materials (in process)

  6. HVS operation • Field operations • Rigid pavement testing • Rapid setting concrete • Dowel- and tie-bars • Widened slabs • Dowel-bar retrofit

  7. HVS operation • Field operations • Palmdale – Operator and assistant operators

  8. Value addition projects • Rigid pavements • 1st level analysis of HVS data • Flexible pavements • Mechanistic-empirical design • Subgrade design • Unbound materials • Pozzolanic stabilization • Deep in situ recycling

  9. Value addition projects:Rigid pavements • Warping of slabs • In John Harvey’s words: “Tell me the deflection you want and I’ll tell you the time to go and measure” • Longitudinal cracking of slabs because of cantilever effects • Preliminary conclusions • Reduce stiffness of support layer • Narrow slabs with tie-bars better than • widened slabs without tie-bars and • narrow slabs without tie-bars

  10. Value addition projects:Flexible pavements • Mechanistic-empirical design • Input at bi-annual workshops • Probabilistic design (risk of failure) • Material response characterization • Elastic response – Resilient modulus models • Plastic response – Permanent deformation transfer functions • Utilization of PMS data for validation of M-E design method

  11. Value addition projects:Flexible pavements • Subgrade design • Analysis of all suitable HVS data from Richmond Field Station and South Africa • New insight into subgrade behaviour • New subgrade design critical parameters and transfer functions

  12. Subgrade design:Elastic response

  13. Subgrade design:Elastic response

  14. Subgrade design:Plastic response R2 = 0,659 SEE = 0,375

  15. Value addition projects:Flexible pavements • Unbound materials • Comparison with Californian aggregate • Material specification • Construction quality (density specification) • Synthesis report on South African experience • Advanced laboratory testing and material modelling • HVS test results • Pozzolanic stabilization • Synthesis report on South African practice • Material and quality specification • Mechanical behaviour • Durability study (carbonation) of cement-treated material and lean concrete

  16. Value addition projects:Flexible pavements • Deep in situ recycling • Synthesis report on selected South African experience • Process promoted by AALP in CALTRANS regions • Lots of interest from regions and CALTRANS Research • Gautrans comprehensive RDI plan • Meeting between E Sadzik, T Hoover, J Harvey and N Coetzee following PMS conference in Seattle • Pledged support for Gautrans process by funding HVS and laboratory testing

  17. Conclusions • International Technology Transfer in action • Financial benefit not only to CSIR but South Africa • South African practical expertise exchanged for top international analytical skills

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