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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: Autoclaved Cement-Based Products Containing Fly Ash
Author(s): Thorkild Bach
Publication: Special Publication
Appears on pages(s): 291-312
Keywords: autoclaved products; autoclaving; fly ash; gypsum;
hemihydrate; plasticizers; Portland cements; silica; strength.
Abstract:The use of autoclaving processes in producing cement-based products is well established. The main reason for using autoclaving processes is often to increase production rate and/or to decrease sensitivity towards variations in humidity, such as reducing moisture movements. The latter effect is mainly believed to be caused by an improved crystallinity of the finished material. The use of fly ash as the siliceous component in the base mixture is also well known. However, the crystallinity is ignored by the use of a noncrystalline base material, such as fly ash. From productions of autoclaved cement-based products utilizing silica sand it is known, that additions of small amounts of gypsum to the base mixture may improve strength and reduce moisture move-ments. This paper deals with the production of autoclaved materials utilizing fly ash and gypsum or its derivatives. Materials produced are characterized according to their density and strength-characteristics as well as to their crystallinity. The use of gypsum or its derivatives may cause significant improvements in strength as well as in crystallinity, but the op-timum design is closely related to the actual production process as well as to the chemical properties of the base materials and to the physical properties of the fly ash.
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