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Concrete is derived from cement. For about last one century, pigments
have been using with concrete to give them different colors. When pigments
are mixed with concrete, then actually, these pigments tint the color of the
paste portion of the concrete.
Color Pigments used in the Cement Industry
Color Pigments are used in the cement to ensure a
long lasting cement color shade. But for this, the pigment must have a good
quality. These pigments (color) are made from both natural and synthetic
iron oxide, cobalt, titanium dioxide and chromium oxide. From iron oxide
pigments, red, black and yellow color can be obtained. From cobalt pigments,
blue color can be obtained. White color and green color can be obtained from
titanium dioxide and chromium oxide respectively. Other colors like buffs,
brown, tans, coppers, oranges, chocolates and many other colors can be
obtained from the blends of the red, black and yellow colored iron oxide
pigments. These colored pigments are: water- wetable, lightfast, alkali
resistant and will not negatively effect the firmness and strength of the
cement. But, one thing should we remember about the concentration of these
pigments in the cement. This concentration should be within the range of 10%
of the weight of the cementitious ingredients.
Iron Oxide Pigments
Iron Oxide Pigments is one of the most commonly
used pigments with concrete. These pigments are combined with concrete to
protect the concrete from fading or to prevent the leaching out of concrete.
The primary colors of Iron Oxide Pigments are available in red, yellow and
black. With the red colored Iron Oxide pigments, shades of blue or orange
can be found. To create multitude of colors, these pigments having of
different colors are combined together according to a certain ratio. Still
today, the use of Iron Oxide pigments is maximum. The few reasons of this
popularity of this pigments in the cement industry are:
- Non-toxic nature
- Don't fade easily
But, gradually, the use of iron oxide pigments in cement industry has been
replaced by other synthetic pigments
Cobalt generates the blue effect in the cement. But, it is expensive one.
So, it is used in some special cases.
Titanium dioxide produces the white color effect in the cement and other
It generates the green effect in the cement. But, it is expensive one. So,
it is used in some special cases.
Process of combination of cement & pigments
Generally, the pigments don't react with cement,
because pigments are inert in nature. So, pigments are not be counted as
cementitious material contents. But, whenever pigments are mixed with cement
then, these pigments form color of cement grains. This is possible, because
pigments bond with the cement via the hydration process.
The different forms of pigments applied in cement industries
The different forms of pigments are: Powdered
form, Granular form and Liquid form. Pigments work well in all three
different forms, but, these require different handling process and
composition should be different. The most oldest form of pigments is the
Applications of Pigments in the Cement Industry
- Colored Block
- Block Paving
- Concrete Walling
- Patterned Concrete
- Concrete Products