Product & Services
Frequently Asked Questions about the Product
What is portland cement?
Portland cement is composed of calcium silicates and aluminate and aluminoferrite It is obtained by blending predetermined proportions limestone clay and other minerals in small quantities which is pulverized and heated at high temperature - around 1500 deg centigrade to produce 'clinker'. The clinker is then ground with small quantities of gypsum and selected mineral component to produce a fine powder called Portland Cement. When mixed with water, sand and stone, it combines slowly with the water to form a hard mass called concrete
What is setting of cement?
When water is mixed with cement, the paste so formed remains pliable and plastic for a short time. During this period it is possible to disturb the paste and remit it without any deleterious effects. As the reaction between water and cement continues, the paste loses its plasticity. This early period in the hardening of cement is referred to as 'setting' of cement.
How fineness of cement affect strength gain?
Fineness defines the surface area of cement particles present in per unit weight, which implies that more fineness means more particles in unit weight. This enhances the reaction rate which in turn will result in faster gain of strength at earlier stages.
What is blended cement?
Blended cement is obtained by either intergrinding pozzolanic material, slag or selected limestone with clinker along with Gypsum or by blending ground pozzolana ,slag or limestone with Portland cement. They are also termed as composite cements.
Is there any shelf life of cement?
Cement is a hygroscopic material meaning that it absorbs moisture. In presence of moisture it undergoes chemical reaction termed as hydration. Therefore cement remains in good condition as long as it does not come in contact with moisture. If cement is more than three months old then it should be tested for its strength before being taken into use.
What is initial and final setting time of cement?
Initial set is when the cement paste loses its plasticity and stiffens considerably. Final set is the point when the paste hardens and can sustain some minor load. Both are arbitrary points and these are determined by Vicat needle penetration resistance
