The effectiveness of TiO2 additions to mortar to maintain initial conditions in terms of its reflectance to solar radiation

Contact of facades with degradation agents and direct incidence of ultraviolet radiation on external coatings make them more opaque over time, affecting their colour and reflectance characteristics. This study evaluated the effect of adding different TiO2 contents to mortars applied in concrete subs...

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Main Authors:	Dantas, Sérgio Roberto Andrade, Vittorino, Fulvio, Loh, Kai
Format:	Online
Language:	eng
Published:	ANTAC - Associação Nacional de Tecnologia do Ambiente Construído 2017
Online Access:	https://seer.ufrgs.br/ambienteconstruido/article/view/69649
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id	ojs-article-69649
record_format	ojs
spelling	ojs-article-696492017-06-30T15:35:30Z The effectiveness of TiO2 additions to mortar to maintain initial conditions in terms of its reflectance to solar radiation Dantas, Sérgio Roberto Andrade Vittorino, Fulvio Loh, Kai Mortars self-cleaning; Solar and luminous radiativa reflectivity; Heterogêneos photocatalysis; CIELAB; Self-cleaning surfaces. Contact of facades with degradation agents and direct incidence of ultraviolet radiation on external coatings make them more opaque over time, affecting their colour and reflectance characteristics. This study evaluated the effect of adding different TiO2 contents to mortars applied in concrete substrates in order to verify the reflectance maintenance on surfaces after exposure over time. Mortar with different concentrations of TiO2 (1%, 5%, 10%) were produced in relation to the total dry premix, added as a powder and compared to unpainted mortar without TiO2 (type “A”) and painted mortar without TiO2 (type “B”), both used as a reference for colour and reflectance. Exposed over 16 months to climate conditions in São Paulo, regarding the maintenance of reflectance and solar radiation, the results showed that type “B” (0%TiO2) painted mortar presented the best performance. Type “C” (1%TiO2) and type “D” (5%TiO2) unpainted mortar remained more stable. Type “A” (0%TiO2) and type “E” (10%TiO2) unpainted mortar showed greater differences according to the Just Noticeable Difference (JND) range caused by dirt pick up. ANTAC - Associação Nacional de Tecnologia do Ambiente Construído 2017-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion https://seer.ufrgs.br/ambienteconstruido/article/view/69649 Ambiente Construído; v. 17, n. 3 (2017); 39-56 Ambiente Construído; v. 17, n. 3 (2017); 39-56 Ambiente Construído; v. 17, n. 3 (2017); 39-56 1678-8621 1415-8876 eng https://seer.ufrgs.br/ambienteconstruido/article/view/69649/42235 Direitos autorais 2017 Ambiente Construído https://creativecommons.org/licenses/by/4.0
institution	Universidade Federal do Rio Grande do Sul
collection	OJS
language	eng
format	Online
author	Dantas, Sérgio Roberto Andrade Vittorino, Fulvio Loh, Kai
spellingShingle	Dantas, Sérgio Roberto Andrade Vittorino, Fulvio Loh, Kai The effectiveness of TiO2 additions to mortar to maintain initial conditions in terms of its reflectance to solar radiation
author_facet	Dantas, Sérgio Roberto Andrade Vittorino, Fulvio Loh, Kai
author_sort	Dantas, Sérgio Roberto Andrade
title	The effectiveness of TiO2 additions to mortar to maintain initial conditions in terms of its reflectance to solar radiation
title_short	The effectiveness of TiO2 additions to mortar to maintain initial conditions in terms of its reflectance to solar radiation
title_full	The effectiveness of TiO2 additions to mortar to maintain initial conditions in terms of its reflectance to solar radiation
title_fullStr	The effectiveness of TiO2 additions to mortar to maintain initial conditions in terms of its reflectance to solar radiation
title_full_unstemmed	The effectiveness of TiO2 additions to mortar to maintain initial conditions in terms of its reflectance to solar radiation
title_sort	effectiveness of tio2 additions to mortar to maintain initial conditions in terms of its reflectance to solar radiation
description	Contact of facades with degradation agents and direct incidence of ultraviolet radiation on external coatings make them more opaque over time, affecting their colour and reflectance characteristics. This study evaluated the effect of adding different TiO2 contents to mortars applied in concrete substrates in order to verify the reflectance maintenance on surfaces after exposure over time. Mortar with different concentrations of TiO2 (1%, 5%, 10%) were produced in relation to the total dry premix, added as a powder and compared to unpainted mortar without TiO2 (type “A”) and painted mortar without TiO2 (type “B”), both used as a reference for colour and reflectance. Exposed over 16 months to climate conditions in São Paulo, regarding the maintenance of reflectance and solar radiation, the results showed that type “B” (0%TiO2) painted mortar presented the best performance. Type “C” (1%TiO2) and type “D” (5%TiO2) unpainted mortar remained more stable. Type “A” (0%TiO2) and type “E” (10%TiO2) unpainted mortar showed greater differences according to the Just Noticeable Difference (JND) range caused by dirt pick up.
publisher	ANTAC - Associação Nacional de Tecnologia do Ambiente Construído
publishDate	2017
url	https://seer.ufrgs.br/ambienteconstruido/article/view/69649
work_keys_str_mv	AT dantassergiorobertoandrade theeffectivenessoftio2additionstomortartomaintaininitialconditionsintermsofitsreflectancetosolarradiation AT vittorinofulvio theeffectivenessoftio2additionstomortartomaintaininitialconditionsintermsofitsreflectancetosolarradiation AT lohkai theeffectivenessoftio2additionstomortartomaintaininitialconditionsintermsofitsreflectancetosolarradiation AT dantassergiorobertoandrade effectivenessoftio2additionstomortartomaintaininitialconditionsintermsofitsreflectancetosolarradiation AT vittorinofulvio effectivenessoftio2additionstomortartomaintaininitialconditionsintermsofitsreflectancetosolarradiation AT lohkai effectivenessoftio2additionstomortartomaintaininitialconditionsintermsofitsreflectancetosolarradiation
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The effectiveness of TiO2 additions to mortar to maintain initial conditions in terms of its reflectance to solar radiation

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