What is Cement(concrete)
Cement, in general, adhesive substances of all kinds, Cements of this kind are finely ground powders that, when mixed with water, set to a hard mass OR setting and hardening result from hydration, which is a chemical combination of the cement compounds with water that yields submicroscopic crystals or a gel-like material with a high surface area. The raw materials used: Chalk, Clay, Iron ore, Lime - stone, Shale, Shells Silica sand and slag.
Types of cement
Rapid-hardening cement
Contractors or construction teams may choose rapid-hardening cement for its high strength in the early stages of the hardening process. Its strength in three days is comparable to OPC strength at seven days with the same water-to-cement ratio. Rapid-hardening cement may have an increased lime content, combined with a finer grinding process, or better strength development. It is often used for projects with early-stage formwork removal or when the focus is on increasing construction rates and decreasing costs.
Ordinary Portland cement
Ordinary Portland cement is the most widely used type of cement manufactured and used worldwide. “Portland” is a generic name de - rived from a type of building stone quarried on the Isle of Portland in Dorset, England. OPC is suitable for most general concrete jobs and mortar or stucco construction projects.
Portland pozzolana cement
Manufacturers create Portland pozzolana cement by grinding pozzolanic clinker, sometimes with additives of gypsum or calcium sulfate, with ordinary Portland cement. Compared to OPC, it has a higher resistance to various chemical reactions within concrete. PPC is often used for projects like bridges, piers, dams, marine structures, sewage works or underwater concrete projects.
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