Cement Products - OPC

OPC is a premium 52,5N Portland cement that offers more value in every bag. It is ideal for a broad range of applications in the construction, building, readymix, precast and concrete product manufacturing industries.

OPC conforms to the 52,5 N strength class of SANS 50197-1 for common cements and, depending on source factory, is identified as:

  • Portland Cement CEM I 52,5 N
  • Portland Composite Cement CEM II/A-L 52,5 N

“CEM I” denotes the addition of between 0 and 5% minor addition constituent. 

“CEM II/A-L” denotes the addition of between 6 and 20% limestone extender.

 

Chemical Composition
Typical OPC results for the PPC Group
Sans 50197-1 requirements
Insoluble residue: % by mass

2,0

5,0 maximum

Sulphur trioxide: % by mass 2,0 4,0 maximum
Loss on ignition: % by mass

2,5

5,0 maximum

Chlorides: % by mass <0,01 0,1 maximum

 

Physical Properties
Typical 52,5N results for PPC Group
SANS 50197-1 requirements
Setting times:
Initial: minutes
Final: hours


125
2,5


45 minimum
No requirement

Specific Area (Blaine):m2/kg 400 No requirement
Compressive strength (mortar prism EN 196-1):
At 2 days (MPa)
At 28 days (MPa)

28 ± 58

≥ 20,0
≥ 52,5 no maximum
Soundness: Le Chatelier Expansion (mm) 1 10 maximum
Densities:
Relative density
Bulk density, aerated, kg/m3
Bulk density, as packed, kg/m3   

3,14
1100-1300
1500
 
Approximate Volume: 50kg bag, litres ± 33

Bulk storage silos should be inspected on a regular basis to ensure that the inspection hatch seal is watertight and filters are clean and unblocked. 

Cement bags are not weatherproof and should be stored indoors, tightly packed together under cover, off the ground to a maximum height of 12 bags.

Bags – 50kg Polypropylene bags 

(for transportation by road or rail):

  • Unitised 40 bags (2 tons) per unit
  • Unitised on a pallet 40 bags (2 tons) per unit
  • Unitised on a pallet and covered with plastic hood. 40 bags (2 tons) per unit.

(Please note the hood is shower-proof NOT waterproof) 
(for transportation by the sea):

  • Sling bags 40 x 50kg bags in 2-ton sling bag
  • Containers: 50kg bags packed loose or in sling bags or on a pallet in standard shipping containers

Bulk 
(for transportation by road or rail):

  • Bulk cement in road or rail tankers is not recommended as the high transportation cost does not make this viable

(for transportation by the sea):

  • Bulk cement in 1,5 ton bulk bags as break-bulk or packed in shipping containers