Fly ash brick (FAB) is a building material, specifically masonry units, containing class C fly ash and water. Compressed at 28 MPa (272 atm) and cured for 24 hours in a 66 °C steam bath, then toughened with an air entrainment agent, the bricks last for more than 100 freeze-thaw cycles. Fly ash brick (FAB) offers standard dimensions of a common concrete block are 44cm by 10cm by 21.5cm. Cement bricks now days first choice to build your dream home.