On the other hand, already huge volume of fly ash is generated around the world; most of the fly
ash is not effectively used, and a large part of it is disposed in landfills. In Viet Nam, volumes of
fly ash are generated about 600,000 tons, but 100,000 is used to produce concrete. As the need
for power increases, the volume of fly ash would increase. It is necessary and significant to use
fly ash as material to produce concrete without Portland cement.