Structural Lightweight Aggregate Concrete by Dr J L Clarke

By Dr J L Clarke

Light-weight combination concrete is present process whatever of a renaissance. even though this fabric has been to be had for a few years, purely now's it getting used extra generally. the amount of structural mixture concrete used every year is expanding dramatically. reduce structural weight, higher hearth resistence, use of waste for mixture, reduce expenses for combination: a majority of these elements are contributing to the speedy raise within the use of recognition of structural light-weight mixture concrete. This e-book offers a finished assessment of this turning out to be box from a world standpoint.

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32 STRUCTURAL LIGHTWEIGHT AGGREGATE CONCRETE (b) Behaviour of structures in fire. There is only limited published information on the behaviour of lightweight aggregate concrete buildings in fire. Forrest [16] attempted to obtain information from 25 countries but found that generally ‘no national authority distinguishes between dense and lightweight aggregates when reporting on fires in concrete structures’. He does publish details of fires in six lightweight buildings (in London, Melbourne and Japan) and concludes that the ‘fire resistance has been extremely good and the building restored to usefulness with a minimum of repair or even no repair necessary’.

6 refers to an oven-dry density of 1401–1600 kg/ m3 with corresponding design densities of 1650 kg/m3 for plain concrete and 1750 kg/m3 for reinforced concrete. The ACI definition of structural lightweight concrete [8] is one having an air-dry density of less than 1810 kg/m3. This would exclude some stronger, but heavier, European aggregates, which would thus class as normal weight concretes for design purposes. The Australian code [11] covers structural lightweight aggregate concrete with a minimum density of 1800 kg/m3.

E; London, October 1987. ACI Committee 211–2–91: Recommended practice for selecting proportions for structural lightweight aggregate concrete, 1992. BS 1881 (slump test): Method for determination of slump, Part 102:1983, BSI, London. BS 1881 (flow test): Method of determination of flow, Part 108:1984, BSI, London. , Shear strength of lightweight aggregate concrete beams, Magazine of Concrete Research, 39 (No. 141; 1987), 205–13. L. , Shear resistance of lightweight aggregate concrete slabs, Magazine of Concrete Research, 42 (No.

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