Class-1_Cement- A Basic Overview clinker.pptx

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1. Cement: A Basic Overview By Gauranka Moran

2. Cement : A basic overview Cement is a fine powder material, which can work as a binder when water is added to it. The word “cement” is derived from the Latin word “ caementum ”, which means chipped rock fragments.

3. History Of Cement

4. History Of Cement

5. History Of Cement

6. Cement : A basic overview Chemically cement is a mixture of Silicates, Aluminates & aluminoferrites with some amount of MgO and gypsum. Various complexes contained in cement: (2CaO.SiO2) Di Calcium Silicate (C2S) 22-24% (3CaO.SiO2) Tri Calcium Silicate (C3S) 50-58% (3CaO.Al2O3) Tri Calcium Aluminate (C3A) 10-11% (4CaO.Al2O3.Fe2O3) Tetra Calcium Aluminoferrite (C4AF) 8-9% (6CaO.Al2O3.Fe2O3) Hexa Calcium Aluminoferrite (C6AF) traces MgO <5% Gypsum (CaSO4.2H2O) 4-5% Various oxides contained in cement: CaO 60-66% Total silica 20-15% Combined silica/active silica Uncombined or inert silica Alumina (Al2O3) 3-8% Fe2O3 1-5% MgO <5% Alkalis <5%0

7. Cement : A basic overview Colour The gray color in cement is due to presence of complexes of Ferric ions in O.P.C (ordinary Portland cement). White cement is produced from those raw materials which contain extremely low conc. of Iron & even like low conc. of Iron is converted from Fe+3 to Fe+2 (which can be done by reducing or maintaining atmosphere in the kiln) & eventually the product appears to be white. Raw Materials required for Cement manufacturing Limestone ( CaCO3, MgCo3, SiO2) Clay (SiO2, Al2O3, Fe2O3 Mg(OH)2, Alkali) Sandstone (SiO2, Fe2O3, CaO , Alkali) Gypsum (CaSO4.2H2O)

8. Cement : A basic overview

9. Cement : A basic overview

10. Cement : A basic overview

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