Hydraulic and Non-Hydraulic Cement
Cement that is used in the construction industry can be classified into mainly two kinds of cement namely Hydraulic Cement and Non-Hydraulic Cement.
Hydraulic Cement and Non-Hydraulic Cement Difference
There are differences in their composition and the way they are used.
- Hydraulic Cement is made out of limestone, clay and gypsum. Non Hydraulic Cement is composed of lime, gypsum plaster and oxychloride.
- Hydraulic Cement hardens when there is a chemical reaction between anhydrous cement powder with water. The hydrates that are formed are not soluble in water. It retains its strength and hardness below water. Non hydraulic Cement hardens when there is a reaction due to carbonation with the carbon di oxide which is naturally present in the air.
- Hydraulic Cement hardens under water or when in contact with wet weather. Hence it is suitable to work with in any climatic conditions. Non Hydraulic Cement should be kept dry to attain strength.
- Hydraulic cement is used in multiple applications like concrete, mortar in masonry, swimming pools, marine construction, foundations, manholes, reservoirs to name a few. Non hydraulic cement is becoming redundant and obsolete due to the long duration of time taken for setting of cement.
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