Photocatalytic Performance of White Cement Mortars Exposed in Urban Atmosphere

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Sergio Roberto Andrade Dantas
Sergio Roberto Andrade Dantas
σ
Fulvio Vittorino
Fulvio Vittorino
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Kai Loh
Kai Loh
α Universidade de São Paulo Universidade de São Paulo

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Photocatalytic Performance of White Cement Mortars Exposed  in Urban Atmosphere

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Abstract

The objective of this study was evaluation of the photocatalytic performance of the addition of n-TiO 2 in white cement mortars in terms of the light reflection (evaluated by CIE L*a*b* scale) and reflectance of the mortar surfaces exposed to solar radiation in an urban environment. Are produced specimens of 1.2m × 1.2m with n-TiO 2 additions of 1%, 5%, and 10% concerning to the total dry powder mass. The performances of the specimens were then compared with two sets without n-TiO 2 , painted and unpainted, and these were used as references. To conduct an in-situ experiment, the mortars were mixed and applied by a mason. After 41 months of exposure and washing of the specimens, the painted mortars and the mortars with the addition of different n-TiO 2 contents exhibited a statistically equivalent reflectance under exposure to solar radiation. All specimens exhibited color differences resulting from: (i) the accumulation of dirt on the surface; (ii) an increase in the surface roughness of the specimens; and (iii) a decrease in rainfall over the duration of exposure.

References

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Funding

No external funding was declared for this work.

Conflict of Interest

The authors declare no conflict of interest.

Ethical Approval

No ethics committee approval was required for this article type.

Data Availability

Not applicable for this article.

How to Cite This Article

Sergio Roberto Andrade Dantas. 2019. \u201cPhotocatalytic Performance of White Cement Mortars Exposed in Urban Atmosphere\u201d. Global Journal of Research in Engineering - C: Chemical Engineering GJRE-C Volume 19 (GJRE Volume 19 Issue C2): .

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Journal Specifications

Crossref Journal DOI 10.17406/gjre

Print ISSN 0975-5861

e-ISSN 2249-4596

Keywords
Classification
GJRE-C Classification: FOR Code: 861001
Version of record

v1.2

Issue date

October 9, 2019

Language
en
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The objective of this study was evaluation of the photocatalytic performance of the addition of n-TiO 2 in white cement mortars in terms of the light reflection (evaluated by CIE L*a*b* scale) and reflectance of the mortar surfaces exposed to solar radiation in an urban environment. Are produced specimens of 1.2m × 1.2m with n-TiO 2 additions of 1%, 5%, and 10% concerning to the total dry powder mass. The performances of the specimens were then compared with two sets without n-TiO 2 , painted and unpainted, and these were used as references. To conduct an in-situ experiment, the mortars were mixed and applied by a mason. After 41 months of exposure and washing of the specimens, the painted mortars and the mortars with the addition of different n-TiO 2 contents exhibited a statistically equivalent reflectance under exposure to solar radiation. All specimens exhibited color differences resulting from: (i) the accumulation of dirt on the surface; (ii) an increase in the surface roughness of the specimens; and (iii) a decrease in rainfall over the duration of exposure.

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Photocatalytic Performance of White Cement Mortars Exposed in Urban Atmosphere

Sergio Roberto Andrade Dantas
Sergio Roberto Andrade Dantas Universidade de São Paulo
Fulvio Vittorino
Fulvio Vittorino
Kai Loh
Kai Loh

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