Iron oxide red discoloration after concrete solidifies may be due to the following reasons:
1. Alkali is generated during the hydration process of cement concrete, and the PH will be very high, which will corrode the color and cause fading;
2. Cement concrete itself will form an efflorescence phenomenon on the surface, which is generally white. This white color will appear to make the red color “fading”;
3. The later growth of mold, black spots, dust adsorption, etc. on cement concrete will also cause the color to be covered and fade;
4. The long-term effect of ultraviolet rays.
You can use high-quality iron oxide red slurry and mix it with concrete in proportion and then add appropriate additives to form a protective film on the surface to prevent the influence of climate on its color.
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