Cemet Standard
Cement Type I: Portland Cement (CEM I)
Cement Type II: Portland – Slag Cement ( CEM II/A-S)
Cement Type II: Portland – Puzzolana Cement ( CEM II/A-P, CEM II/B-P)
Cement Type II: Portland – Fly ash Cement ( CEM II/A-V, CEM II/B-V)
Cement Type II: Portland – Limestone Cement ( CEM II/A-L, CEM II/B-L )
Cement Type II: Portland – Composite Cement ( CEM II/A-M, CEM II/B-M )
Cement Type III: Blastfurnace Cement ( CEM III/A, CEM III/B, CEM III/C )
Cement Type IV: Pozzolanic Cement ( CEM IV/A, CEM IV/B )
Cement Type V: Composite Cement ( CEM V/A, CEM V/B )
Kind of Cement Overview
Portland Clinker
Is a result of a chemical reaction of limestone, clay and other additive materials under extreme heat treatment in a kiln which mostly consists of Calcium silicates and Aluminates. To produce grey clinker, raw materials such as Iron oxides, clay and … are usually combined with limestone.
Portland Cement
The result of grinding portland clinker + additives (gypsum,slag or …) in a cement mill. Portland cement is the most common type of cement that sometimes called OPC (Ordinary Portland Cement).
Cement Type 1
If the cement type is not mentioned, usually type one is assumed. It is used in conditions that low sulfate attack occurs also for making common mortar or concrete for buildings.
Type 1-325 – The minimum resistance is 325 kg/cm2 after 28 days.
Type 1-425 – The minimum resistance is 425 kg/cm2 after 28 days.
Cement Type 2
Cement type 2 is the most produced cement type in Iran. This type of cement has low heat of hydration and should be strong enough to resist moderate sulfate attacks and could be used underground water or deep in the earth with high percentage of Sulfates.
Cement Type 5
It’s an anti-sulfate Portland cement which is used for making concrete which high resistance to sulfates. This type of cement is used for building dams, bridges and underground constructions because of its low heat of hydration and extremely high resistance. It is not recommended for making reinforced concrete because of chemical chlorine attacks.
Pozzolanic Cement
This type of cement contains up to 15% Pozzolan. Pozzolanic cement is used for big constructions because its heat of hydration is lower than cement type 2. The rate of its resistance development is also slower that type 2 and 5, but in long-term it surpasses them both. Its main characteristic is its high chemical resistance which makes pozzolanic cement a suitable candidate to be used in environment with high Sulfate and Chlorine degree. Concrete which is made of this cement has low Permeability, high durability & chemical resistance.
Special Pozzolanic Cement
This product contains between 15 to 30% pozzolan. The degree of the pozzolan could be different due to costumer’s request. This type of cement could be used for building dams.
White Cement
For use in buildings where the use of high-strength concrete with no color are required. The color of the cement used in cement production. White Portland cement is made of special materials which contains very little iron, and manganese. This is where the need to limit the consumption of cement walls with white or clear, and usually associated with a particular aggregate is used. Since the price of ordinary Portland cement, white Portland cement is about double, so the entire process, transport, mixing, observing precautions must be taken to prevent contamination, all equipment must be cleaned.
Oil and Gas well Cement
OWC find a wide application in the exploration for and the production of oil and gas.
For securing the metal casing and liners, out of which the oil and gas eventually flows. Oilwell cements can also be used for sealing water wells, waste disposal wells and geothermal wells.
They fulfill the requirements for materials forming low-viscosity slurries, which remain pump able to considerable depths and can be tailored to harden rapidly once in place.
The chemical and physical properties of oil well cements are given relevant specifications such as the API Specification 10A.
Oil well Cement Specifications
There are 9 different oil well classes according to API standard. In Iran the four A, D, E and G classes are mostly produced. These products are made by milling the cement clinker with gypsum and other additives.
Class A: This type is used in 0 to 6000 feet depth and the temperature lower than 170 °f. When special properties are needed for the cement stone this type of cement is used.
Class D: This type is used in 6000 to 10000 feet depth with relatively high pressure zones. This type is produced in medium sulfate resistant (MSR) and high sulfate resistant (HSR) types.
Class E: This type is used in 10000 to 14000 feet depth with relatively high pressure and high temperature zones. This type is produced in medium sulfate resistant (MSR) and high sulfate resistant (HSR) types.
Class G: This type is used as base cement from the surface to 8000 feet depth. Use of any type of additives except calcium sulfate in producing this type of oil well cement during milling or blending is forbidden. This type is produced in medium sulfate resistant (MSR) and high sulfate resistant (HSR) types.
