By Alexander, Mark Mindess, Sidney
Bringing jointly in a single quantity the most recent examine and knowledge, this publication presents a detailed consultant to the choice and use of aggregates in concrete. After an creation defining the aim and position of aggregates in concrete, the authors current an summary of mixture resources and creation suggestions, through a close examine in their actual, mechanical and chemical houses. this data is then utilized to using aggregates in either plastic and hardened concretes, and within the total combine layout. exact aggregates and their purposes are mentioned intimately, as are the present major necessities, criteria and assessments.
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Additional info for Aggregates in Concrete (Modern concrete technology series 13)
Pyrites are also frequently found in waste rock dumps, and these can cause unsightly staining in concrete. 9. Aggregate properties such as particle shape, surface texture, and grading will be covered in later chapters. However, it is instructive to examine how aggregate source and production affect these important properties. 6. Aggregate beneficiation Beneficiation as applied to aggregate production has a precise meaning: it refers to the selective removal of undesirable constituents in an aggregate.
Sand and gravel deposited from glaciers constitute most of the economic deposits found in previously glaciated areas. On the other hand, many natural aggregates are sourced from fresh hard rock quarries, and require blasting and crushing to produce engineering materials. The various sources of natural aggregates and the production processes necessary to render the raw materials acceptable for use in concrete will be covered briefly. The interested reader should consult detailed texts for further information on aggregate production (Sims and Barksdale, 1998, and references therein; Brown, 1991; Smith and Collis, 2001).
Aggregates need to be handled, transported, and stockpiled in preparation for use, and these processes require careful control to ensure consistency of supply (MillerWarden, 1967). 34 Natural aggregate sources and production Pit or terrace sources Physical and chemical weathering of rocks has produced vast quantities of granular materials, much of which are suitable for use as concrete aggregates. They may be present as residual materials from parent rocks, or as transported materials that have been moved over the earth’s surface and then deposited by ice, water, or wind.
Aggregates in Concrete (Modern concrete technology series 13) by Alexander, Mark Mindess, Sidney