FLY ASH FOR USE IN CONCRETE - 2. A CRITICAL REVIEW OF THE EFFECTS OF FLY ASH ON THE PROPERTIES OF CONCRETE.

Within limits, the application of appropriate proportioning methods and the use of a high quality fly ash permit the economic manufacture of concrete of adequate early strength. When properly proportioned and placed, fly ash concrete generally shows improved workability, pumpability, cohesiveness, finish, ultimate strength, and durability. It has been found that fly ash is of particular value in high-strength concrete. Its use has often been shown to improve the performance of concretes exposed to sulphate attack or to deterioration caused by alkali-aggregate interactions. However, research on fly ash concrete has still been inadequate.