Finest quality of Cement/ Clinker using the good quality of lime stone from its captive Mines and also procured from nearby mines, suitable for manufacturing premium grade Ordinary Portland Cement (53 grade) and Portland Pozzolana Cement (Fly-ash based).
Portland Pozzolana Cement (PPC) is manufactured by blending pozzolanic materials, OPC clinker and gypsum either grinding them together or separately. As per latest Government Notifications, the Portland Pozzolana Cement is widely used for construction of industrial and residential buildings, cement roads, dams, flyovers, bridges and machine base foundations. Pozzolana is an important ingredient in PPC which is commonly used in the form of Fly ash, volcanic ash, Silica fumes, Calcined clay, etc.
The BIS quality specifications for Pozzolana materials used in PPC have been mentioned below:
PPC is used in heavy load infrastructure and constructions such as marine structures, hydraulic structures, mass concreting works, plastering, masonry mortars and all applications of ordinary Portland cement.
| Particulars | Test Result | BIS Requirement(IS:1489:PART-I:1991) |
| 3 days | 26-28 MPa | 16 MPa |
| 7 days | 36-38 MPa | 22 MPa |
| 28 days | 48-50 MPa | 33 MPa |
| Fineness | ||
| Specific surface (m2/kg) | 340-380 | 300 min |
| Setting Time | ||
| a. Initial (minutes) | 120-140 | 30 (not less than) |
| b. Final (minutes) | 210-220 | 600 (max.) |
OPC 53 Grade cement is a comparatively higher strength Cement to meet the needs of the consumer requiring higher strength concrete. As per BIS requirements, the minimum compressive strength of 53 Grade OPC should not be less than 53 MPa after 28 days. For certain specialized works, such as pre-stressed concrete and certain items of pre-cast concrete requiring consistently high strength concrete, the use of 53 Grade OPC is found very useful. 53 Grade OPC produces higher grade concrete at very economical cement content. In concrete mix design, for concrete M-20 and above grades, a saving of 8 to 10 % of cement may be achieved with the use of 53 grade OPC.
| Particulars | Test Result | BIS Requirement(IS:12269:1987) |
| 3 days | 37-39 MPa | 27 MPa |
| 7 days | 48-50 MPa | 37 MPa |
| 28 days | 58-60 MPa | 53 MPa |
| Fineness | ||
| Specific surface (m2/kg) | 320-340 | 225 MIN |
| Setting Time | ||
| a. Initial (minutes) | 110-120 | 30 (not less than) |
| b. Final (minutes) | 180-200 | 600 (max.) |