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Ultra-thin layer Asphalt workshops

Scope of workshops. To discuss concerns with UTLAs. Initially defined as <25 mm (but consideration should be given to thicknesses of up to 30 mm)Provide solutions to address the concernsTwo workshopsSuppliers/contractorsClients/consultants. Conclusions. Performance expectations and design param

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Ultra-thin layer Asphalt workshops

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    1. Ultra-thin layer Asphalt workshops May 2002

    2. Scope of workshops To discuss concerns with UTLAs. Initially defined as <25 mm (but consideration should be given to thicknesses of up to 30 mm) Provide solutions to address the concerns Two workshops Suppliers/contractors Clients/consultants

    3. Conclusions Performance expectations and design parameters for UTLAs vary widely 4 different types were identified Conventional asphalt (<30mm) Stone Mastic Asphalt Thin layer performance asphalt Residential asphalt Confusion about the different types of UTLAs

    4. Main Concerns Compaction Inexperience with the use of UTLAs Inappropriate pavement designs Inappropriate mix designs Inappropriate specifications

    5. New findings Widespread confusion about the different types of UTLAs The extent of engineering compromise which occurs in some applications The problems with rapid cooling in all seasons in SA The need to provide for inexperienced supervisors and designers in the future

    6. Suggested actions To redefine UTLA as “various asphalt gradings with a layer thickness of 30mm or less” Develop new guidelines covering the identified needs of basic construction supervision and a generic functional layer (in residential areas) Thin layer performance asphalts were deemed to be proprietary products and outside the scope of such a guideline

    7. Area for consideration

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