Why do black, colored and gray concrete block surfaces appear lighter in the course of time?

Fading concrete block surfaces –

Bonding stability of pigments in hardened cement paste

The needle-shaped structures existing in the concrete block are ideal bonding spots for metal oxide pigments such as Bayferrox iron oxide pigments, titanium dioxide, chrome oxide or cobalt spinel and some other inorganic pigments. These dipolar pigment particles are electrostatically bonded into the cement (what does not apply to carbon or organic pigments) and are furthermore mechanically captured in the hardened cement paste matrix. These metal oxide pigments are not able to leave the cement matrix as has been revealed by outdoor...

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(10) WO 2020/003570 A1 (22) 25.01.2019 (43) 02.01.2020 (57) Provided are a colored concrete block manufacturing method, with which a wide variety of color coating materials can be used and there is...

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Issue 2016-04 Huntsman

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Huntsman Pigments and Additives is a leading supplier of inorganic pigments and functional additives for the construction industry. In addition to our high-quality pigments, pigments, our customers...

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Issue 2010-04 Evironmentally Materials

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Products made of photocatalytic concrete are mainly achieved by cements that are doped with photocatalytic titanium dioxide, therefore only white and grey products are commonly available. There is...

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