Type II Portland Cement
Description :
The changes in the raw materials of this type of cement resulting to quality optimization of the above cement and such changes have brought about 20% reduction in Alkali and MgO.
This type of cement is not only semi – sulphate resisting but also has the mechanical resistance similar to the type I cement.
Uses :
The concrete paving that requires moderate Hydration heat and to some extent they have expected sulphates resistance. This cement can be used for the same purpose as type I cement.
Advantages :
This cement is a modified of type I cement which is adjusted for the generated heat and to some extend this cement of sets the sulphates attack to the concrete.
This cement has a suitable mechanical resistance.
Limitations :
For those areas, which are severely affected by the sulphat attacks.
For those concert paving which require high primary resistance.
A concrete paving in a very cold weather.
C150 , ASTM Standard & 389 ISIRI Standard
CHEMICAL SPECIFICATION OF PORTLAND CEMENT TYPE ІІ
| Standard | Sio2 | Al2o3 | Fe2o3 | Cao | Mgo | So3 | Cl | Ins.Res | L.O.I | Na20+0.658K20 | F. Cao |
| ASTM | >20 | <6 | <6 | | <6 | <3 | | <0.75 | <3 | | |
| ISIRI | >20 | <6 | <6 | | <5 | <3 | | <0.75 | <3 | | |
| F.R.S Co. Cement | 21.2- 22.6 | 4.8- 5.2 | 3.7 -4.1 | 63.4- 64-2
| 2.4- 2.8 | 1.2- 1.6 | <0.04 | 0.3- 0.6 | 0.5 -0.8 | 0.9 -1.1 | 1.0- 1.4 |
PHYSICAL SPECIFICATION OF PORTLAND CEMENT TYPE ІІ
| Standard | Blaine | Autoclave Expansion | Setting time | Compressive Strength Kg/cm2 | Heat of cal/gr. hydration |
| | Cm2/g | % | INITIAL(MIN) | Final (Min) | 3days | 7Days | 28days | 7Days | 28days |
| ASTM | >2800 | <0.8 | >45 | <375 | >105 | >175 | | >70 | |
| ISIRI | >2800 | <0.8 | >45 | <360 | >100 | >175 | >315 | >70 | |
| F.R.S Co. Cement | 2850-3000 | 0.09- 0.15 | 90-110 | 130-180 | 180-230 | 290-330 | 410- 450 | 60- 65
| 70- 78 |
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