Question

properties of cement ​

Answer 1

It's prepared from gypsum by adding water to plaster if Paris.

Answer 2

$<b>Fineness:</b>$
The uniform size among the particles in the cement is the main reason for their undeterrable strength. The finer the particles the perfect the strength build-up in them. High fineness denotes that there is more area available for water reaction in the cement.


$<b>Soundness:</b>$
The ability to not change the properties when water is mixed with it is called as soundness. Material which is sound, don’t get cracks or structural weakness easily. This is the sole reason for cement being very useful. Concrete and mortar, which are made from cement. have high soundness.


$<b>Consistency:</b>$
The uniformity in the particle nature is what makes the whole material very consistent. Due to regularity, the whole finished product is very consistent in strength.

$<b>Setting Time:</b>$
The time at which the cement paste loses its plasticity after the addition of water is known as initial Setting Time. The time consumed by paste to become hard mass is known as final Setting Time. The initial setting time is required for mixing, transporting and placing of the concrete. At the time of initial setting time the temperature rises rapidly and at the final setting time, the temperature reaches the peak value.

$<b>Heat of Hydration:</b>$
The chemical reaction between cement and water is known as hydration of cement and heat generated in this is known as heat of hydration.

$<b>Comprehensive strength:</b>$
This is the strength of cement which helps it to resist Compressive stress.