In the field of concrete, how is iron oxide red applied?

Walking through the school sports field, passing the airport runway, and the city walls around the tourist palace, we saw all kinds of red,In this red, there is iron oxide red, which is the crystallization of iron oxide red used in the field of concrete. Well, in the field of concrete, iron oxide red how to use?
     
Iron oxide red is used as a pigment or colorant in all kinds of concrete prefabricated parts and building product materials, and can be directly transferred to use, such as various indoor and outdoor colored concrete surfaces such as walls, floors, ceilings, pillars, porches, pavements, parking lots, stairs, cars stations, etc., various architectural ceramics and glazed ceramics, such as face tiles, floor tiles, roof tiles, panels, terrazzo, mosaic tiles, artificial Dali stone etc. Its specific usage is:

The amount of iron oxide red in concrete products is limited to 1 to 10%. If the limit is too high, the mechanical strength of the product will be reduced, usually within 5-10%. 8% is suitable. Iron oxide red contains two compounds of lead and zinc oxide, which will affect the setting time and setting strength.

Concrete products sometimes need to be cured by hot pressing above 200°C, so about black and brown oxides that can be converted to iron red at 180°C iron must first be treated by thermal stabilization. If used on terrazzo, the thickness of the bottom layer is 2 to 3 cm, and the thickness of the surface layer is 15 cm.

Iron oxide red is used in the field of concrete, which utilizes the excellent weather resistance, alkali resistance and light resistance of iron oxide red. These functions not available with other inorganic pigments or organic pigments. 

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