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Saturday, 20 July 2019
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Raw materials & technologies, Technologies

Characterisation of concrete surface in relation to graffiti protection coatings

Thursday, 19 November 2015

The removal of graffiti causes irreversible deterioration of fair-faced concrete.

Graffiti paint easily penetrate into hydrophilic porous concrete surface layer. Source: Alipictures/pixelio.de

Graffiti paint easily penetrate into hydrophilic porous concrete surface layer. Source: Alipictures/pixelio.de

The protective products are often selected without counting the properties of concrete surface leading to its insufficient protection.

Surface energy analysis allows assessment of concrete wettability

Portuguese researchers analysed chemical and micro-structural effects of anti-graffiti products on the concrete surface in relation to its protection efficiency against graffiti paints. Contact angles and wetting envelope graphs were examined, allowing the understanding and prediction of wetting behaviour of concrete surfaces. The obtained results revealed the changes on the concrete surface produced by graffiti, graffiti protection and graffiti removal products, showing the advantage of permanent protection coating over sacrificial one.

The study is published in: Construction and Building Materials, Volume 102, Part 1, 15 January 2016, Pages 435-444.

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