Aggregates in Concrete (Modern concrete technology series by Alexander, Mark Mindess, Sidney

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By Alexander, Mark Mindess, Sidney

Bringing jointly in a single quantity the most recent learn and data, this booklet offers a detailed advisor to the choice and use of aggregates in concrete. After an advent defining the aim and position of aggregates in concrete, the authors current an outline of mixture assets and creation options, via a close learn 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. distinctive aggregates and their functions are mentioned intimately, as are the present major necessities, criteria and exams.

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All sulphates can attack concrete and mortar. Pyrite, marcasite, and pyrrhotite: Frequently found in natural aggregates. They may oxidize to sulphuric acid, and form iron oxides and hydroxides, which can attack or stain the concrete. 15. Magnetite: Black-coloured common mineral, Fe3 O4 Haematite: Red-coloured common mineral, Fe2 O3 Ilmenite: Black, weakly magnetic, less common mineral, FeTiO3 Limonite: Brown weathering product of iron-bearing mineral. These minerals give colour to rocks and also colour concrete.

Rock properties that influence the quality of the crushed product are hardness, fracture toughness, structure (fine- or coarse-grained or laminar), moisture content, and homogeneity. 8 Schematic diagrams of some types of crusher; solid shading highlights hardened wear-resistant elements: (a) single-toggle jaw crusher; (b) disc or gyrosphere crusher; (c) gyratory crusher; and (d) impact crusher (reprinted from Sims and Brown, 1998 ©1997, with permission from Elsevier). important since this mineral is harder than normal steel.

2. Processing of pit and terrace sources usually requires the following: a b Washing and scrubbing. These processes are carried out to remove unwanted materials such as excessive clay or silt fractions and/or soluble salts if present. Washing can occur by jetting during screening or by use of a washer barrel. More vigorous washing is carried out using ‘scrubbers’ which help to remove resistant clay lumps. Screening and sorting. Consistent aggregate size gradation is very important for producing good quality concrete.

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