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HDM-4: The Road Deterioration and Maintenance Effects Study

The Project Team. Mike RileyLouw KannemeyerTom Van DamAlex Visser/Gerrie Van ZylGustav RohdeZulakmal bin SufianPeter Cenek. Limitations of HDM-III from the RDME viewpoint. HDM-III does not consider:Rigid pavementsMany types of flexible pavementsPavement texture and skid resistanceFreeze-th

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HDM-4: The Road Deterioration and Maintenance Effects Study

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    1. HDM-4: The Road Deterioration and Maintenance Effects Study

    2. The Project Team Mike Riley Louw Kannemeyer Tom Van Dam Alex Visser/Gerrie Van Zyl Gustav Rohde Zulakmal bin Sufian Peter Cenek

    3. Limitations of HDM-III from the RDME viewpoint HDM-III does not consider: Rigid pavements Many types of flexible pavements Pavement texture and skid resistance Freeze-thaw conditions

    4. Other criticisms Heavily biased toward South American conditions Empirically tied to specific construction materials environment Ignores urban roads

    5. Project Objectives Focus on areas not addressed in HDM-III Little, if any, primary research Consider available research and implement appropriate findings Provide guidance on inputs and selection of calibration coefficients

    6. Research Tasks 1010: Review of Experience 1020: Pavement Strength and FWD 1030: Rigid Pavement Models 1040: Extension of AC Models 1050: Maintenance Effects 1060: Texture Effects

    7. Task 1010: Review of Experience Status: Draft issued at end of 1994 Reports from 45 countries were reviewed Summarises pavement relationships of HDM-III Presents calibrations used in other studies Found wide use of HDM-III models but not a lot of guidance on new models

    8. Task 1020:Strength and FWD In HDM-III, strength represented by SNC, modified Structural Number Relationships provided between BB deflection and SNC for different materials Widespread use of FWD has spurred the development of MSN-FWD relationships

    9. Task 1020:Continued FWD has potential to provide more data in cost-effective manner Work by Gustav Rohde of South Africa has led to a proposed model of the following form: SN = a0 SIP HP

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