Ordinary Portland Cement (OPC)
Ordinary Portland cement is the most commonly used cement for a wide range of applications. These applications cover ordinary, standard, high strength concretes, masonry and plastering works, precast concrete products for e.g., blocks, pipes etc., and specialized works such as precast and pre-stressed concrete.
Portland Pozzolana Cement (PPC)
Portland Pozzolana cement is ordinary Portland cement intimately blended or inter ground with pozzolanic materials such as fly ash, calcined clay, rice husk ash etc.
Portland cement clinker is either inter ground or intimately blended with specified quantities of gypsum and pozzolanic materials to produce Portland Pozzolana cement. Pozzolanas by themselves do not have cementitious properties but reacts with calcium hydroxide in the presence of moisture at normal temperature to form compounds having cementitious properties. The concrete produced by using Portland Pozzolana cement has high ultimate strength, is more durable, resists wet cracking, thermal cracking and has a high degree of cohesion and workability in concrete and mortar.
Portland Limestone Cement (PLC)
PLC is a slightly modified version of Portland cement that improves both the environmental footprint and the basic performance of concrete. Quality requirement of PLC is well described in ASTM and EN specifications and is used just like traditional Portland cement in mix designs. While ordinary Portland cement (OPC) may contain up to 5% limestone, PLC may contains between 5% and 30 % limestone depending on the strength requirement. PLC’s have the potential to significantly improve concrete sustainability with performance equal to or better than typical ordinary Portland cements. PLC’s can be used seamlessly as a substitution for OPC’s in mix designs. Normally PLC is ground much finer to meet the quality requirement and ideally suited for plastering application.
Sulphate Resisting Portland Cement (SRC)
Sulfate Resisting Cement is designed to improve the performance of concrete where the risk of sulfate attack may be present. It also provides improved durability for concrete in most aggressive environments, reducing the risk of deterioration of the structure and structural failure. Sulphate Resisting Portland Cement is ( SRC ) 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 pile foundations, basements and underground structures, soil with high level of sulpahtes.
Oil Well Cement (OWC)
OWC is a special type of cement normally being used in the oil / gas well casing applications. The quality requirements of such cements are controlled by American Petroleum Institute (API ) under different categories. The classification starts from A and goes up to J. Normally each type is nominated for different depths of the well starting from 1830 mtrs for category “A” till 4880 mtr for category “F” & “J”. Few important quality requirements which determine the well cement manufacturing are the thickening time, free fluid % and the compressive strength at 38 and 60 Deg C. Well Cement testing requires a special laboratory set up wherein API certified instruments need to be used for testing various quality requirements.