Defination of cement
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Cement is a material that's used to build very strong, hard surfaces and structures. Cement is an ingredient in both mortar, which holds bricks together, and concrete, with which dams and roads and buildings are constructed.
Cement begins as a powder made of clay and limestone, and after it's mixed with water and, often, sand, it's used to strengthen and bind things — as the mixture dries, it becomes hard and solid. A version of cement has been around since the third century BCE, in Mesopotamia. The word comes from the Latin root cæmenta, "stone chips for making mortar," from caedere, "to cut or chop."
Cement begins as a powder made of clay and limestone, and after it's mixed with water and, often, sand, it's used to strengthen and bind things — as the mixture dries, it becomes hard and solid. A version of cement has been around since the third century BCE, in Mesopotamia. The word comes from the Latin root cæmenta, "stone chips for making mortar," from caedere, "to cut or chop."
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Cement
Definition : A grey colored heavy fine powder which become stone like hard in contact with water is called cement. similar to portland rock a famous building stone of England. So, it is also known as portland cement. It was first name by Joseph Aspidin as portland cement and was discovered in England.
Did you know the average composition of cement ?
The average composition of cement are listed below :-
- Calcium oxide (CaO) ⇒ 62 %
- Silicon (SiO₂) ⇒ 22 %
- Alumina (Al₂O₃) ⇒ 7.5 %
- Magnesium oxide (MgO) ⇒ 2.5 %
- Ferric oxide. (Fe₂O₃) ⇒ 2.5 %
Did you know about setting of Cement ?
Lets, know about that
When cement is mixed with water, it becomes hard due to the formation of a solid mass. This process is called setting. Hydration of cement is an exothermic process.
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