1- Type I Portland Cement .
Description :
This type of cement has recently been upgraded from the resistance class of 1-325 which was produced previously . to the resistance class of 1-425 the improved 1-425 has considerably increased the resistance for type I cements .the production of the 1-425 cement is gone through the testing stages in order to obtain the seal of standard .
Uses :
The type I cement can be used for all purposes . because of high resistance of this cement its use more suitable for those purposes which requires high primary resistance . such as blocks markers prefabricated beams and Etc….
Advantages :
Great mechanical resistance . its three days primary resistance can even meet the standard requirements for type III cement . it has moderate resistance for preventing corrosion of chlorine . its price is fair and economical because less cement is used in designing concrete mix .
Limitations :
For those purpose which the concrete is exposed to the existing sulphates in soil or water (for example the sea water ) C150 AStM Standard & 389 ISIRI Standard .
Chemical specification of Portland cement type I
| Standard | So2 | Al2o3 | Fe2o3 | Cao | Mgo | So3 | Cl | Ins.Res | L.O.I
| Na2O+0.658k20 | F. Cao |
| ASTM | | | | | <6 | <3.5 | | <0.75
| <3 | | % |
| ISIRI | | | | | <5 | <3.5 | | <0.75
| <3 | | |
| F.R.S Co. Cement | 21.2-.21.6 | 5.40-5.90 | 3.20-3.45 | 63.8-64.5 | 2.0-2.5 | 1.4-2.0
| <0.04 | 0.40-0.65 | 0.6-1.2 | 0.8-1.0 | 1.0-1.8 |
Physical specification of Portland cement type I
| Standard | Blaine | Autoclave Expansion | Setting time | Compressive Strength Kg/cm2 | Heat of cal/gr. hydration |
| | Cm2/g | % | Final (Min) | Final (Min) | 3days | 7Days | 28days
| 7Days | 28days |
| ASTM | >2800 | <0.8 | >45 | <375 | >128 | >197 | | | |
| ISIRI | >2800 | <0.8 | >45 | <360 | >120 | >200 | >330 | | |
| F.R.S Co. Cement | 2850-3000 | 0.1-0.2 | 90-110 | 130-180 | 180-220 | 290-330 | >400-450 | 68-78 | 80-90 |
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