To optimize aggregate unit cost and quality, it is essential for quarries to adopt a systems based approach that considers all the independent variables influencing aggregate production, asserts Dr Basson. His paper covers the constraints and goals of every aspect of the process: drill and blast design, load and haul, crushing principals and crusher selection, and the screening process.
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For those who need a deeper understanding, it is all included in this detailed summary – versatility, water resistance, ductility, cohesion, adhesion, elastic recovery, softening point, penetration, temperature susceptibility, viscosity, oxidation, specific gravity and durability.
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Johannes Lambert covers all the bases in this detailed presentation, including the chemistry and refining of bitumen, classification and properties of bitumen binders…
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Binder modification has become the norm as the performance limits of conventional bitumen have been reached. The author believes practitioners need to understand all modifiers to provide the best match for each application. This presentation provides an overview of different modifiers available and how to use them to overcome different binder limitations.
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A binder manufacturer discusses the impact of historic seasonal trends on availability of products and services, the characteristics of winter seal products, and issues around health, safety and the environment.
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Find out what lessons can be learned from sealwork trials – from seal geometry to binder aggregate contact and adhesion, to temperature and micro-climates, to cutters, precoating and bond strength, base preparation and viscosity. Gerrie provides practical recommendations for asphalt practitioners.
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All you need to know including current practices, international and South African trends and experience, embargos, different binders, feedback on stripping and cutters, and evaluation of both trial and existing winter seals.
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