Influence of addition of calcium sulfate dihydrate on drying of autoclaved aerated concrete

The quality of the autoclaved aerated concrete (AAC) strongly depends on the chemical composition of the raw materials, as well as on the process of the hydrothermal reaction during autoclaving. Performance parameters depend on material structure: fine micron-scale matrix porosity generated by the p...

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Bibliographic Details
Published in:Open Engineering (Warsaw) 2017-11, Vol.7 (1), p.273-278
Main Authors: Małaszkiewicz, Dorota, Chojnowski, Jacek
Format: Article
Language:English
Subjects:
autoclaved aerated concrete
calcium sulfate dihydrate
stabilized moisture content
water absorption
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Summary:The quality of the autoclaved aerated concrete (AAC) strongly depends on the chemical composition of the raw materials, as well as on the process of the hydrothermal reaction during autoclaving. Performance parameters depend on material structure: fine micron-scale matrix porosity generated by the packing of thin tobermorite plates and coarse aeration pores arising from the foaming of wet mix. In this study the binder varied in calcium sulfate dihydrate (CaSO ⋅2H O) content. Five series of AAC specimens were produced, with gypsum content 0; 0.55; 1.15; 2.3 and 3.5% of dry mass respectively. AAC units were produced in UNIPOL technology. The study presents experimental results of AAC moisture stabilization. The initial moisture content was determined directly after autoclaving. Slower drying process was observed for samples containing over 2% of gypsum. Whereas other performance parameters, compressive and tensile strength, as well as water absorption and capillary rise, were significantly better comparing to the reference AAC samples.
ISSN:2391-5439
2391-5439
DOI:10.1515/eng-2017-0032