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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: In-Service Behavior of Reinforced Autoclaved Aerated Concrete Planks
Author(s): Anthony Goodier and Stuart Matthews
Publication: Special Publication
Appears on pages(s): 1197-1214
Keywords: Autoclaved products; creep properties; deflection; performance; strength.
Abstract:Concerns have been expressed to the Building Research Establishment (BRE) by a number of United Kingdom (UK) structural engineering consultants and local government bodies about the in-service performance of reinforced autoclaved aerated concrete (RAAC) planks. Many RAAC roof planks are reported to have developed appreciable in-service deflections and soffit cracking, which has raised concerns about the implications for the future structural performance and safety of the planks. Exploratory structural testing has been undertaken with the general aim of establishing the current strength and deformation characteristics of a small number of RAAC planks removed from a roof. The testing found that the load capacity of the RAAC planks tested was adequate for the circumstances in which the planks were being used, even where the planks were exhibiting signs of appreciable in-service deflection and extensive cracking on their soffits. The ability of the RAAC planks to meet the standard deflection serviceability criteria used for beam and slab structures is more doubtful. There are a number of mechanisms which may be contributing deflection and cracking problems observed in RAAC roofs. to the
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