1.Lime:It is very important in cement.It forms about 63 percent of cement. The nature of cement depends on it.Defeciency in lime reduces the strength of cement and cause it to set quickly. Again excess cause cement unsound and cause disintegration and expantion.
2.Silica:It is another important compound. It imparts strength to concrete.
3.Alumina:It imparts quick setting property of cement. Clinkering temperature is lowered by adding of alumina.
4.Magnesia:It should not present in cement more than 2 percent.Excess reduce strength.
5.Iron oxide:It imparts the color of cement. At high temperature it goes to a chemical reaction with calcium and aluminium and forms tetracalcium aluminofferrite which imparts hardness and strength.
6.Salphur tri oxide:It should not present more than 2 percent.Excess cause cement to be unsound.
7.Calcium sulphate:It is present in cement in the form of gypsum.It retards the setting of cement.
8.Alkalies: It should not present more than 1 percent.Excess cause efflorescence.
2.Silica:It is another important compound. It imparts strength to concrete.
3.Alumina:It imparts quick setting property of cement. Clinkering temperature is lowered by adding of alumina.
4.Magnesia:It should not present in cement more than 2 percent.Excess reduce strength.
5.Iron oxide:It imparts the color of cement. At high temperature it goes to a chemical reaction with calcium and aluminium and forms tetracalcium aluminofferrite which imparts hardness and strength.
6.Salphur tri oxide:It should not present more than 2 percent.Excess cause cement to be unsound.
7.Calcium sulphate:It is present in cement in the form of gypsum.It retards the setting of cement.
8.Alkalies: It should not present more than 1 percent.Excess cause efflorescence.
Hii..
ReplyDeleteyes i read about "Silica"..that
During the manufacturing of cement, silica undergoes chemical reaction with calcium to form dicalcium and tricalcium silicates which are responsible for imparting strength to the cement. i like the other points that you have shared here. thanks for sharing..
Complete cement plants
Thanks for your inspiring comment and sorry for my delay reply.Actually all the thinks shared here in my blog is from note I made while studying Engineering Materials course and its in saturated point.So I have not observed the blog for long time.If you have any additional information please share with me and I invite you as an writer anytime.Because while I was in my study I felt that there is less information about the subject in net.
DeleteALUMINA LOWERS THE CLINKERING TEMP ,HOWEVER HIGH TEMP IS ESSENTIAL FOR SUITABLE TYPE OF CEMENT AND HENCE SHOULD NOT BE IN EXCESS ,AS IT WEAKENS THE CEMENT
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