cement clinker

Ordinary Portlanf Cement Clinker Technical Specifications

ACCORDING TO CHINESE STANDARD GB/T21372-2008

TESTING ITEMS

UNITS

Result of Analysis

STANDARD

TEST STANDARD

MAGNESIUM OXID  

MgO

%

4.12

5.0MAX

GB/T176-1996

SULFAR TRIOXIDE  

SO₃

0.52

1.5MAX

CALCIUM OXIDE    

CaO

64.92

63.0 MIN

SILICON DIOXIDE   

SiO₂

21.52

18-24  

ALUMINUM OXID  

Al₂O₃

4.82

4.0-9.5

FERRIC OXIDE     

Fe₂O₃

3.05

2.0-5.5

LOSS ON IGNITION 

LOI

0.32

1.5MAX

TOTAL ALKALI

Na2O+0.658K2O

0.57

0.60MAX

INSOLUBLE RESIDUE

IR

0.21

0.75MAX

F-CaO

1.32

 1.5MAX

3CaO·SiO₂          

C₃S

58.41

37-65  

GB/T21372-2008

2CaO·SiO₂          

C₂S

17.92

15-37 

3CaO·Al₂O₃         

C₃A

7.12

6-15

4CaO·Al₂O₃·Fe₂O₃  

C₄AF

8.92

7-18

BY CALCULATION

Initial Setting Time

minute

87

60MIN

GB/T1346-2001

Final Setting Time

128

300MAX

Compressive Strength @ 03 days

Mpa

32.5

25MIN

GB/T17671-1999

Compressive Strength @ 28 days

-

52.5MIN