Properties of Cements
Cement is a binder, that can sets and hardens independently and is used to bind some other materials together. The volcanic ash and crushed pulverized brick additives are altogether added to burnt lime to lime to obtain a hydraulic binder were later called as cementum, cimentum, cament and cement.
Cement which is used in construction is characterized as hydraulic and non hydraulic. Example for hydraulic cement is Portland cement, and example for Non hydraulic cement is Lime and gypsum plaster. The most important use of cement is the production of mortar and concrete. Concrete should not be confused with cement, concrete is the combination of cement and aggregate.
Physical properties of cement
The mentioned physical properties of cement are about; setting time, strength, soundness, fineness of grinding. For determining these properties, IS 268-1975 prescribes the requirement and the standard procedure.
Table: Requirement Physical properties of cement
|Physical property||Standard prescribed|
For initial not less than 30 min
For final not more than 600 min
|(b)Compressive strength of mortar with standard sand
After 3 days ± 1hour
After 3 days
Not less than 16 N/mm2
Not less than 2.0 N/mm2
(c)SoundnessBy Le-Chatelier method
By autoclave method
Expansion should not be more than 10mm
Expansion should not be more than 0.5%
(d)FinenessResidue by weight on IS 90 micron sieve
Specific surface by air permeability method
Not more than 10%
Properties of Cement Mortar
The following are properties of cement mortar,
Properties of cement concrete
Properties of cement concrete are, concrete has high compressive strength but lower tensile strength and it is usually reinforced with materials that are strong in tension. At lower stress level, the elasticity of concrete is constant, but it starts decreasing at higher stress levels as matrix cracking develops. Every concrete structure will crack to some extent, because of its shrinkage and tension.
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