Generally, the percentage of SiO2 sand in AAC concrete is 55-65 %.
For details, kindly you can see her
Mallampalli.Ch. G.Subash , V.S.V.Satyannarayana , Janga Srinivas ( 2016) " AERATED AUTOCLAVED CONCRETE (AAC) BLOCKS: A REVOLUTION BUILDING MATERIAL IN CONSTRUCTION INDUSTRY " (http://www.ijstm.com/images/short_pdf/1456154923_351S.pdf)