Process for producing autoclaved aerated concrete using silica raw materials having higher solubility than quartz
AssigneeFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
InventorsTaban Shamshafshejani, Georg Schober, Severin Seifert
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Abstract
The present invention relates to an autoclaved aerated concrete having a content of tobermorite of at least 12.5 wt % and a content of amorphous CSH phases of at least 30 wt %, based on the total weight amount of autoclaved aerated concrete, the process for producing said autoclaved aerated concrete using a silica source, which comprises a soluble silica species and a low curing temperature and the use of a silica source, which comprises a soluble silica species for the production of an autoclaved aerated concrete.
Claims12
A process for producing an autoclaved aerated concrete comprising the steps of:
- a) preparing a suspension comprising a silica source and a calcium oxide source in water, wherein the silica source comprises at least 50 wt % of soluble silica species;
- b) preparing a green porous solid from the suspension of step a);
- c) steam curing the green porous solid from step b) at a temperature of from 100° C. to 170° C. in the presence of saturated water steam;
- and
- d) recovering the autoclaved aerated concrete,
- wherein the autoclaved aerated concrete has a content of tobermorite of at least 12.5 wt % and a content of amorphous calcium silicate hydrate (CSH) phases of at least 30 wt %, based on the total weight amount of autoclaved aerated concrete.
Dependencies are inferred from the claim text.