A cement is a powered materials,used in construction that can sets,hardens and bind other materials together.It has such a special properties that when cement is combined with water it develops strong adhesive qualities.It is a fine grayish powder which,when mixed with water forms a thick paste,Cement can be differentiated in two category depending upon the ability of the cement to set in the presence of water.The two different types of cement are:Non-Hydraulic cement and Hydraulic cement.Non-Hydraulic cement will not set in wet conditions but sets as it dries and Hydraulic cement will set in wet condition as well as.
Cement was firat invented by the Egyptians.It was later reinvented by the Greeks and the Babylonians.After some time,the Romans start to produce cement from pozzolana.Pozzolana was an ash found in all of the volcanic areas of Italy.By mixing the ash with lime cement was produced.
The first cement manufactured in the United States was produced in 1871 by David Saylor of Coplay,Pennsylvania.There are two types of raw materials which are used to make cement.They are:Lime containing materials like limestone,marble,oyster shells,marl, chalk and Clay and clay containing materials like shale,slag from blast furnaces,bauxite,iron ore,silica, sand etc.There are few steps on maufacturing of cement.They are listed as below: