Any evidence on the energy efficiency of manufacturing fly ash bricks?
YES. From a study conducted in July 2007, entitled “Energy in Making Bricks: A comparison between Clay Bricks and Flyash Bricks,” it was found that great saving of energy can be accomplished by manufacturing Greenest Bricks instead clay bricks, due mainly to the elimination of the kiln firing process needed for manufacturing clay bricks, which is very energy intensive. This study found that steam curing of Greenest Brick uses only about 5% of the energy used in kiln firing of clay brick. Consequently, while the energy cost of Greenest Brick is only about $5 per thousand bricks, the energy cost of clay brick is more than $60 per thousand bricks. This means the saving that can be achieved from making fly ash bricks instead of clay bricks is about $60 per thousand bricks, or 6 cents per brick.
