Discoloration of white concrete containing photoactive Ti02

Anna Kronlöf, Liisa Salparanta, Tapio Vehmas

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Photoactive titania is able to activate chemical reactions in the presence of UV radiation by producing a free electron and an electron hole. These can activate e.g. decomposition of organic compounds and oxidation. This phonemena has inspired the development of new products that possess so called photoactive functional surface properties. Being a fine powder, titania needs to be bound with some kind of adhesive material. Organic binders have the disadvantage of becoming potentially decomposed in the course of the photoactive reactions, whereas inorganic binders remain intact. Cement (OPC) as the most widely used binder would be one obvious choice. White mortar samples containing titania (TiO2) were found to turn yellow during the exposure to UV-light both in outdoor and laboratory conditions. The discoloration could harm the visual appearance of high quality concrete surfaces if not taken into consideration while selecting the titania type. Key words: Photoactivity, UV exposure, titania, concrete, discoloration.
Original languageEnglish
Pages (from-to)25-28
JournalNordic Concrete Research
Volume43
Issue number1
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed
EventXXI Nordic Concrete Research Symposium - Hotel Rantasipi Aulanko, Hämeenlinna, Finland
Duration: 30 May 20111 Jun 2011

Fingerprint

Discoloration
Concretes
Binders
Ultraviolet radiation
Electrons
Mortar
Organic compounds
Powders
Surface properties
Chemical reactions
Adhesives
Cements
titanium dioxide
Decomposition
Oxidation

Keywords

  • titania
  • photoactivity
  • functional surface
  • discoloration

Cite this

Kronlöf, Anna ; Salparanta, Liisa ; Vehmas, Tapio. / Discoloration of white concrete containing photoactive Ti02. In: Nordic Concrete Research. 2011 ; Vol. 43, No. 1. pp. 25-28.
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abstract = "Photoactive titania is able to activate chemical reactions in the presence of UV radiation by producing a free electron and an electron hole. These can activate e.g. decomposition of organic compounds and oxidation. This phonemena has inspired the development of new products that possess so called photoactive functional surface properties. Being a fine powder, titania needs to be bound with some kind of adhesive material. Organic binders have the disadvantage of becoming potentially decomposed in the course of the photoactive reactions, whereas inorganic binders remain intact. Cement (OPC) as the most widely used binder would be one obvious choice. White mortar samples containing titania (TiO2) were found to turn yellow during the exposure to UV-light both in outdoor and laboratory conditions. The discoloration could harm the visual appearance of high quality concrete surfaces if not taken into consideration while selecting the titania type. Key words: Photoactivity, UV exposure, titania, concrete, discoloration.",
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Kronlöf, A, Salparanta, L & Vehmas, T 2011, 'Discoloration of white concrete containing photoactive Ti02', Nordic Concrete Research, vol. 43, no. 1, pp. 25-28.

Discoloration of white concrete containing photoactive Ti02. / Kronlöf, Anna; Salparanta, Liisa; Vehmas, Tapio.

In: Nordic Concrete Research, Vol. 43, No. 1, 2011, p. 25-28.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Discoloration of white concrete containing photoactive Ti02

AU - Kronlöf, Anna

AU - Salparanta, Liisa

AU - Vehmas, Tapio

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AB - Photoactive titania is able to activate chemical reactions in the presence of UV radiation by producing a free electron and an electron hole. These can activate e.g. decomposition of organic compounds and oxidation. This phonemena has inspired the development of new products that possess so called photoactive functional surface properties. Being a fine powder, titania needs to be bound with some kind of adhesive material. Organic binders have the disadvantage of becoming potentially decomposed in the course of the photoactive reactions, whereas inorganic binders remain intact. Cement (OPC) as the most widely used binder would be one obvious choice. White mortar samples containing titania (TiO2) were found to turn yellow during the exposure to UV-light both in outdoor and laboratory conditions. The discoloration could harm the visual appearance of high quality concrete surfaces if not taken into consideration while selecting the titania type. Key words: Photoactivity, UV exposure, titania, concrete, discoloration.

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KW - functional surface

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