Fly ash bricks material ratio and timing to mixture

Fly ash bricks material ratio and timing to mixture

First  mix                Lime                          10% Less then 1 minute
Then Second         Gypsum                     5%   Less then 1 minute
Then Third             Stone Dust                 30% 2-3 minute
Last                        Fly ash                       55% 2-3 minute

Then add water according requirement...