fly ash vs aac bloc -

 https://blog.wishkarma.com/product-comparision/fly-ash-bricks-vs-aac-blocks/

https://www.wishkarma.com/product-type/building-blocks/aac-blocks

https://www.ultratechcement.com/for-homebuilders/home-building-explained-single/descriptive-articles/All-You-Need-To-Know-About-Autoclaved-Aerated-Concrete-AAC-Blocks