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Some Portland cement is produced by grinding clinker manufactured by burning raw materials like limestone, marl, clay, iron ore, pyrite ash, bauxite etc. at appropriate proportions by addition of a certain amount of retarder (generally gypsum) and sets and gains strength after a certain time being mixed with water. 


Our Grey Ordinary Portland Cement conforms to British Standard Specification BS12/1996 or ASTM C-150.

 SPECIFICATIONS AND CHEMICAL COMPOSITION OF PORTLAND CEMENT

CHEMICAL

ANALYSIS

UNIT

CONTROL

RANGE

TYPICAL

SILICON DIOXIDE (SiO2)

%

20.8 23

21

ALUMINIUM AXIDE (Al2O3)

%

4.5 6.0

5.30

FERRIC OXIDE (Fe2O3)

%

3.1 6.0

3.30

CALCIUM OXIDE (Cao)

%

64 - 68

65.60

MAGNESIUM OXIDE (Mgo)

%

1.0 5.0

1.10

SULPHUR TRIOXIDE (SO3)

%

2.7 3.0

2.70

LOS OF IGNITION (Loi)

%

1.0 3.0

1.90

INSOLUBLE RESIDUE

%

0.1 0.7

0.4

TRICALCIUM SILICATE (C3S)

%

50.0 64.4

60

DICALCIUM SILICATE (C2S)

%

14.2 18.2

15

TRICALCIUM ALUMINATE ( C3A)

%

6.0 9.5

8.05

TRIC. ALUMINO FERRICE (C4Af)

%

10.5 12.0

9.76

CHROMIUS ES. (CR6) AT LEST FOR A 6 MONTHS PERIOD

 

 

<2ppm

 

 

Physical And Mechanical Properties:

BLAIN CM2/GR

 

3.25

AUTOCLAVE EXPANSION

 

002

NORMAL CONSISTENCY

%

27.5

INITIAL SETTING TIME

Hours Mins

3:25 4:50

FINAL SETTING TIME

Hours Mins

4:54 6:00

FINTES INDEX

(CM2/GM)

2800 - 3040

COMPRENSIVE STRENGTH ISO/EN 19/200

BS 4550 MORTAR

@ 03 DAYS

KG/CM2

26.5 34.2

@ 07 DAYS

KG/CM2

37.3 42.5

@ 28 DAYS

KG/CM2

52.8 54.6

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