Set_1.__Portland_Cement

Set_1.__Portland_Cement - Portland Cement Raw Materials...

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Portland Cement Production Raw materials are ground and fired in a kiln to a temperature 1425 to 1650 ° C Clinker is ground to 100% passing #200 sieve (74 μ m) Gypsum, CaS0 4 2H 2 0 is added Source Pure limestone Shale Sand Clay Raw Materials Lime, Ca0 Ferric Oxide, Fe 2 0 3 Silica, S i 0 2 Alumina, Al 2 0 3
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Portland Cement Major Compounds Tricalcium silicate: C 3 S Dicalcium silicate: C 2 S Tricalcium alumina: C 3 A Tetra calcium aluminoferrite: C 4 AF Other Compounds Alkali compounds: Na 2 0 and K 2 0 Impurities, Ca0 (free lime) and Mg0
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Portland Cement Rates of Hydration Rapid:C 3 A (gypsum added to reduce the rate of hydration) C 4 AF, CaS0 4 and the alkalis (Na 2 0 and K 2 0) Slow: C 3 S, early age strength gain C 2 S, later age strength gain Rapid Set: Flash set, initial set less than 1 hour, heat released, too little gypsum to reduce the rate of hydration of C 3 A False set, initial set less than 1 hour, little heat released, too much gypsum
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Portland Cement Strength Gain 2 C 3 S plus 6 H 2 0 =
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