High Alumina Cement

This type of cement is manufactured by passing 40% boxite,40% lime,15% iron oxide with little amount of Fe2O3,silica,Mg etc. at a very high temperature.It is not quick setting cement.The initial setting time is more than 3 hrs, final setting time is about 5 hrs.So it allows more time to mixing and placing operations.It attains strength in 24 hrs ,high early strength,high of hydration  and resistance to chemical attack.It is resistance to the action of fire, sea water acidic water and sulphates is used in industries and widely for precasting concrete.It should not be used in place where temperature exceeds 18degree C.