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Influence of the fly ash type on properties of autoclaved aerated concrete

Łagosz A., Szymański P., Walczak P.

Cement Wapno Beton

2011

nr spec.

22-25

This paper is devoted to the relationship between properties of the siliceous fly ash used as an aggregate in production of autoclaved aerated concrete in PGS technology and its properties. Tests were conducted on technological scale. Such technological measurements in this scale are not frequent and the influence of mix components, namely fly ash on the basic functional properties of AAC are seldom found in technical literature. A series of AAC with similar binder content, constant composition and stable properties has been selected for experimental purposes. Fly ash used as an aggregate came from various sources, and the composition and properties were a consequence of both the combustion of coal and co-firing with biomass. The results show that, when the amount of binder and its properties are stable, the properties of ACC, especially compressive strength, are dependent on the properties of fly ash, which fulfils the function of aggregate. Linking such fly ash properties as specific surface area, fly ash water demand and content of unburned carbon may be the basis for a qualitative assessment of raw material in the manufacture of AAC.