Abstract
Autoclaved aerated concrete (AAC) has been used as a lightweight, porous and thermally insulating material. AAC is mainly fabricated by autoclaving composite containing sand, cement, lime, calcium sulfate, and a small amount of aluminum powder content (foaming agent). In the present work the possibility of recycling different industrial and agriculture wastes in AAC-production was studied. The impact of granulated blast furnace slag (GBFS) and meta-kaolin (MK) as cement replacement on the performance of AAC was individually evaluated. In contrast, active silica sources such as silica fume (SF) and rice husk ash (RHA) were used as partial replacement of sand for inactive silica. The physical and mechanical properties were evaluated by measuring bulk density and compressive strength. The hydration products were identified by mean of XRD and DSC techniques. The results proved that, the AAC containing GBFS (GS-AAC) showed the higher mechanical properties compared to that having MK (MK-AAC) at all replacement levels. Samples incorporated with 2.5 wt% RHA and 7.5 wt% SF exhibited the highest mechanical properties compared to that containing silica sand.
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