Coloured cement is manufactured by mixing pigments like chromium oxide, cobalt, iron oxide, or manganese dioxide at 5-10% by weight with ordinary Portland cement to produce different colours. The amount of pigment used depends on the desired shade. White cement is made from pure limestone and clay without iron oxides or other pigments, and the kiln is fired with oil instead of coal to avoid contamination, giving it a milky white appearance. White cement has similar strength and setting time to ordinary Portland cement and is used for highways, curbs, and ornamental and cast stone work.

2. • Coloured cement is manufactured
by mixing colour pigments (5-10 %
) with OPC
• The Pigment is mixed in a finest
powdered state.
• The amount of pigment used
depends upon the shade of the
desired color.

3. Colour cement
• generally less than 10 percent (by
weight). The following pigments are
used to obtain colored cement.
• Chromium oxide is used for green
color.
• Cobalt is used for blue color.
• Iron oxide is used for various shades
of red, brown and yellow color.
• Manganese dioxide is used to obtain
black and deep brown color.

4. Application

5. •It may also be defined as a special type of
Portland cement when used it gives a milky or
snow-white appearance.
•White cement are manufactured from pure
limestone (chalk) and clay that are totally free
from iron oxides and any other pigments like
manganese and chromium.

6. Cont…
•The kiln is fired by oil rather than by coal to avoid
any contamination.
•There strength and setting time is similar to
ordinary Portland cement.
•White cement are the most favored material for
use in making highways curbs and for a variety of
ornamental work. They are also used widely for
making cast stones of appealing appearance.

7. Application