Nowadays, there are a lot of colors on the surface of indoor and outdoor buildings, which beautifies people's visual life. What pigments are used in building materials and how to use them?
Because of its beautiful and durable color, strong sunlight exposure and climate change, alkali resistance and mortar resistance, the properties of cement are not damaged. It has strong coloring power, the most suitable particle size and structure, and good dispersion. Therefore, it is applicable to the coloring of the following building structures and cement products, various indoor and outdoor color concrete surfaces and building surfaces, such as walls, floors, floor tiles, roof tiles, panels, flumes, blocks, towers, color mortar, colored surface tiles, ridge tiles. Terrazzo and mosaic tiles are used to decorate indoor and outdoor walls, ground floors, stairs, porches, passageways, etc. Artificial stone such as artificial marble, artificial tufa stone and so on. Asbestos cement is used to decorate wall panel, floor slab, roof tile, window sill and ladder.
Usage: in concrete products, the amount of Iron Oxide Pigment is limited to 1-10%. If the high limit is exceeded, the mechanical strength of the products will decrease, generally 5-8%. At the same time, the Iron Oxide pigment does not contain lead and zinc oxide, which will affect the setting time and strength. Concrete products sometimes need to be in 200. Therefore, the black and brown iron oxides which can be converted to iron red at 180 ℃ must be heat stabilized. If used on terrazzo, the bottom layer is 2-3 cm thick, and the surface layer is 15 cm thick.
Iron oxide pigments such as iron oxide red have good weather resistance, alkali resistance and light resistance. These properties are not the same as other inorganic pigments or Organic Pigments. Therefore, iron oxide pigments are used in building materials as coatings and coloring. Such as wall decoration, artificial marble, grinding stone floor and the coloring of silicate products. In the airport runway with colored cement or concrete pavement, iron oxide yellow is used for the exterior walls of temples, and iron oxide red is used for surface decoration around the imperial palace.
Color difference of iron oxide red in pavement brick coloring
The problem of color difference of pavement brick has always been a common problem of these manufacturers. Inorganic pigments such as iron oxide red are usually used for coloring of colored pavement bricks. The final color depends on the density of pigment in cement slurry, the accuracy of pigment and cement measurement, and the stability of color of pigment itself.
Sometimes there are some problems in the appearance quality of pavement bricks, such as lack of edges and corners, delamination, cracks, color difference and so on. The reasons for this may be uneven feeding, inaccurate mix proportion, unreasonable maintenance system, large sand and Stone mud content and so on!
In terms of prevention and control measures, we should strengthen the quality control of raw materials, especially the control of mud content in sand and stone. Through practical comparison, the appropriate concrete mix proportion is selected. Under the condition of meeting the requirements of sand and stone gradation and concrete workability, the mixing time and vibration time of raw materials should be extended as much as possible, and the improvement of concrete curing conditions should be strengthened; the stone machine equipment along the road should be maintained regularly, and the measuring equipment should be calibrated to reduce the measurement error, so as to make the measurement standard of pigment and cement close to the stable state; and there is the use of different batches Therefore, to select a reliable iron oxide pigment manufacturer is the premise to ensure the color consistency. The quality is stable, and the color difference will be relatively small. Deal with these problems, the appearance of pavement brick will be more and more beautiful !
