Find out how an understanding of the complex geological aspects of aggregates can help you meet the required specifications. Robert Leyland breaks the discussion down into rocks and minerals and the geology of South Africa. Then there are the specifications where geological aspects such as durability, strength, shape, water absorption and bitumen affinity of rock types all make a difference. This paper gets to the heart of the subject.
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Aggregate properties need to be clearly defined in terms of both specification and testing to ensure compliance. To support this, Ray Bonser reviews the relevant specifications including historic factors, the introduction of COLTO 1998, the Aspasa Exclusion Clauses, the current SANS 1083:2018 Edition 2.6 specification and proposed revisions to SANS 1083.
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This presentation will give you the lowdown on methods for storing aggregate, techniques for moving aggregate, sampling techniques, moisture issues, and quality. The objective is to ensure consistency of material, minimising both moisture content and contamination.
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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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