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types of cement
The name 'cement' is given to all adhesives of all kinds, but in particular it is called the materials that are used in building construction and civil engineering, which consist of finely ground powders mixed with water and then become solid and thus become a stabilizing material, and cement is a chemical mixture of cement compounds. With water, it produces sub-microscopic crystals or a gel-like substance with a high surface area and wetting properties, and it is called structural cement.

Cement is divided according to the hardening and setting mechanism into two main categories, hydraulic cement and non-hydraulic cement . Its types are also classified according to composition and properties. The most prominent types of cement are:

Ordinary Portland Cement
Ordinary Portland cement (OPC) is the type most commonly used in regular construction, and consists of Argillaceous or alumina silicate (clay, shale) and calcium carbonate or limestone (limestone, chalk, and marl).

Modified Cement
This type of cement has a lower heat of hydration than ordinary cement and a higher rate of heat development than 'low temperature cement' with a hardening rate similar to that of regular cement, and is usually used in structures with moderately low heat generation or in structures where A moderate sulfate attack occurs, and the country that uses the most modified cement is the United States.

Rapid Hardening Portland Cement
This type is characterized by that it hardens faster than ordinary Portland cement, meaning that its hardening strength in 3 days is equal to the strength of ordinary cement in 7 days, although the two types need the same preparation and setting time, and it has a higher rate of heat development than ordinary Portland cement because it contains C3S and C3A are more in addition to its high purity

and it is mainly used in construction that needs fast hardening, such as removing molds for reuse, or completing construction as quickly as possible, such as building sidewalks or heavy use places that cannot be closed for a long time, and it is preferable to use it when Building in areas with low temperatures to prevent frost damage

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