United Cement Industrial Company will produce three types of cement:
1. Ordinary Portland Cement (OPC)
2. Sulphate Resistant Cement (SRC)
3. Pozzolana Portland Cement (PPC)
What is Cement?
A cement is a binder, a substance that sets and hardens and can bind other materials together. When mixed with water to it can bind sand & gravel into hard, solid mass called concrete. A Mixture of Limestone and Clay is ground and burnt at a very high temperature to form Clinker. The Clinker is ground to a fine powder with addition of Gypsum (up to 5 %) to form Cement. The essential components of Cement are Lime, Silica, Alumina and Iron Oxide.
What is Portland cement (OPC)?
Portland cement (often referred to as OPC, from Ordinary Portland Cement) is the most common type of cement in general use around the world, It is hydraulic cement that not only hardens by reacting with water but also forms a water-resistant product It is a fine powder produced by grinding Portland cement clinker (more than 90%) with Gypsum.
What is Sulphate Resistant Cement (SRC)?
Sulphate Resisting Portland Cement is a type of Portland cement in which the amount of Tricalcium aluminate (C3A) is restricted to lower than 5 % and (2 C3A + C4AF) is lower than 25%. SRC can be used for structural concrete wherever OPC or PPC or Slag Cement is usable under normal conditions. The use of SRC is particularly beneficial in such conditions where the concrete is exposed to the risk of deterioration due to sulphate attack.
The use of SRC is recommended for following applications:
- Foundations, piles.
- Basements and underground structures.
- Sewage and Water treatment plants.
- Chemical, Fertilizers and Sugar factories.
- Food processing industries and Petrochemical projects.
- Coastal works.
- Also for normal construction works where OPC is used.
- Construction of building along the coastal area within 50 km from sea.
What is Pozzolanic Cement (PPC)?
Portland Pozzolana Cement is a kind of Blended Cement which is produced by inter-grinding of OPC clinker along with gypsum and pozzolanic materials in certain proportions.
Pozzolana is a natural or artificial material containing silica in a reactive form, possesses little, or no cementitious properties but will in finely divided form and in the presence of moisture, chemically react with calcium hydroxide at ordinary temperature to form compounds possessing cement properties.
The pozzolanic materials commonly used are:
- Volcanic ash
- Calcined clay
- Fly ash
- Silica fumes
Portland Pozzolana Cement is ideally suited for the following construction:
- Hydraulic structures
- Mass concreting works
- Marine structures
- Masonry mortars and plastering
- Under aggressive conditions
- All other applications where OPC is used