Abstract:
The incident solar radiation on the building envelope is strongly affected by the urban characteristics and building facade materials. This paper reports a study on the variation in the solar reflectance of mortar specimens with different treatments of TiO2 – powder (addition) and suspension (cover) – compared with white painted specimens and exposed in the long term. The solar reflectance of mortars was evaluated at biweekly intervals over three years to reach their degradation over time. The results obtained for the white painted specimens revealed that they practically maintained the exact value of their initial reflectance to solar radiation over three years of exposure ending with 73% of its index. In addition, the comparison between the white painted specimens and specimens with TiO2 powder addition showed a mean solar reflectance difference of 28.25%, showing that difference certainly would be noticed by the final user in terms of absorption and color change. The study also revealed that comparison between the specimens with TiO2 in powder addition and specimens with TiO2 in suspension showed a mean solar reflectance difference of 8.5% and demonstrate that result will not identify by the final user concerning the absorption and color change, and not indicate their preference since both showed the same effectiveness in mean after three years of exposure.
Reference:
DANTAS, Sérgio Roberto Andrade; VITTORINO, Fúlvio; LOH, Kai. Comparison of reflectance to solar radiation between mortars treated with TiO2 and painted mortars after three years of exposure. Journal of Building Engineering, v.46, 17p., Apr., 2022.
Access to the article published on the Journal’s website:
https://www.sciencedirect.com/science/article/abs/pii/S2352710221016879#!
The incident solar radiation on the building envelope is strongly affected by the urban characteristics and building facade materials. This paper reports a study on the variation in the solar reflectance of mortar specimens with different treatments of TiO2 – powder (addition) and suspension (cover) – compared with white painted specimens and exposed in the long term. The solar reflectance of mortars was evaluated at biweekly intervals over three years to reach their degradation over time. The results obtained for the white painted specimens revealed that they practically maintained the exact value of their initial reflectance to solar radiation over three years of exposure ending with 73% of its index. In addition, the comparison between the white painted specimens and specimens with TiO2 powder addition showed a mean solar reflectance difference of 28.25%, showing that difference certainly would be noticed by the final user in terms of absorption and color change. The study also revealed that comparison between the specimens with TiO2 in powder addition and specimens with TiO2 in suspension showed a mean solar reflectance difference of 8.5% and demonstrate that result will not identify by the final user concerning the absorption and color change, and not indicate their preference since both showed the same effectiveness in mean after three years of exposure.
Reference:
DANTAS, Sérgio Roberto Andrade; VITTORINO, Fúlvio; LOH, Kai. Comparison of reflectance to solar radiation between mortars treated with TiO2 and painted mortars after three years of exposure. Journal of Building Engineering, v.46, 17p., Apr., 2022.
Access to the article published on the Journal’s website:
https://www.sciencedirect.com/science/article/abs/pii/S2352710221016879#!
