Abstract
When Ube Fly=Ash are mixed with Cement by about 20%, the properties of Concrete are improved in many aspects as following,
1. much Reduction of Expansion due to Alkali=aggregate Reaction,
2. lower Heat of Hydration by about 20%,
3. increase the Resistance to chemical attacks,
4. increase the Workability of concrete, and decrease the amount of Water required to give normal Consistency,
5. the strengths of mortar and Concrete cured more than 3 monthes are superior to the one without Fly=Ash.
These improvements in property of concrete by mixing Fly=Ash are due to the fact that the Shape of grain of Fly=Ash is spherical, acting as Ball Bearing in Concrete mixture.
