Portland (constructional) Cement is a fine powder mixture of various minerals. It is produced by mixing calcareous minerals such as chalk, limestone containing silica and alumina and heating it to 1450 deg C when it cools a clinker is formed. This clinker is then finely ground and mixed with small quantity 3-5% of gypsum which has calcium sulphate in it. The amount of gypsum controls the physical properties of the eventual concrete. Sometimes very minute quantities of pigments are also added. Cement producing processes do however vary.
TYPES OF PORTLAND CEMENT:
- OPC Ordinary Portland Cement
- Rapid Hardening Portland Cement
- Sulphate Resisting Portland Cement
- Low Heat Portland Cement
- White Portland Cement
PACKING:
- 50 Bags (Paper or Poly bags)
- 1.5 tonne bags
- 2 tonne bags
- Bulk/Loose
Comp. Strength:
3rd dates mpa 12 min
7th dates mpa 19 min
28th dates mpa 28 min
Time of setting, vicat.
Initial 45 min.
Ket thuc/final max.375 min
Autoclave expansion max. 0.8%
Sulfate content/so3 max. 3.5%
Loss on ignition max. 3.0%
Insoluble residue max. 0.75%
Equivalent alkalies (na2o+0.658k2o) max. 0.6%
Air content of mortar max. 12%
Mgo max. 6.0%
Portland (constructional) Cement is a fine powder mixture of various minerals. It is produced by mixing calcareous minerals such as chalk, limestone containing silica and alumina and heating it to 1450 deg C when it cools a clinker is formed. This clinker is then finely ground and mixed with small quantity 3-5% of gypsum which has calcium sulphate in it. The amount of gypsum controls the physical properties of the eventual concrete. Sometimes very minute quantities of pigments are also added. Cement producing processes do however vary.
TYPES OF PORTLAND CEMENT:
- OPC Ordinary Portland Cement
- Rapid Hardening Portland Cement
- Sulphate Resisting Portland Cement
- Low Heat Portland Cement
- White Portland Cement
PACKING:
- 50 Bags (Paper or Poly bags)
- 1.5 tonne bags
- 2 tonne bags
- Bulk/Loose
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