Soudian et al 2020a - Revision history

JSanchez at 13:05, 29 September 2020

2020-09-29T13:05:37Z

Scipediacontent: Scipediacontent moved page Draft Content 551205787 to Soudian et al 2020a

2020-09-23T13:37:57Z

Scipediacontent moved page Draft Content 551205787 to Soudian et al 2020a

Scipediacontent: Created page with "== Abstract == The exterior finish layer in building facades is exposed to considerable environmental loads, which can reduce the service life of the materials, increasing th..."

2020-09-23T13:37:54Z

Created page with "== Abstract == The exterior finish layer in building facades is exposed to considerable environmental loads, which can reduce the service life of the materials, increasing th..."

New page

== Abstract ==

The exterior finish layer in building facades is exposed to considerable environmental loads, which can reduce the service life of the materials, increasing the need for replacement. New climate challenges impose to look more carefully at the long-term performance and durability of building components and materials. Thermal stresses due to daily temperature fluctuations and UV exposure can significantly damage facades and degrade their performance. This research measures the long-term performance of a responsive cementitious finish plaster. The developed cement plaster is combined with phase change materials (PCMs), and thermochromic (TC) pigments to control solar radiation and surface temperatures dynamically on the exterior façade year around. The main objective of the study is to quantify the effect of long-term UV exposure on the optical performance of the cement plasters. PCMs with three different melting temperatures of 18oC, 24oC, and 28oC were combined with two different colors of blue and red TC paint with a transition temperature of 31oC. Accelerated UV aging of the samples was performed using lab tests to simulate exposure to UV radiation for two years. The solar reflectance of the samples was characterized before and after the accelerated UV aging tests. The results of the aging tests revealed that UV exposure impacts the solar reflectance of the finish material based on the method of integrating the TC paint to the cement plaster. In the case of TC paint applied to the surface, the solar reflectance of the plasters with only the TC is reduced by 15% after aging, while the ones combined with PCMs have a similar solar reflectance value after aging.

== Full document ==
<pdf>Media:Draft_Content_551205787p675.pdf</pdf>

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 == Abstract ==
-The exterior finish layer in building facades is exposed to considerable environmental loads, which can reduce the service life of the materials, increasing the need for replacement. New climate challenges impose to look more carefully at the long-term performance and durability of building components and materials. Thermal stresses due to daily temperature fluctuations and UV exposure can significantly damage facades and degrade their performance. This research measures the long-term performance of a responsive cementitious finish plaster. The developed cement plaster is combined with phase change materials (PCMs), and thermochromic (TC) pigments to control solar radiation and surface temperatures dynamically on the exterior façade year around. The main objective of the study is to quantify the effect of long-term UV exposure on the optical performance of the cement plasters. PCMs with three different melting temperatures of 18oC, 24oC, and 28oC were combined with two different colors of blue and red TC paint with a transition temperature of 31oC. Accelerated UV aging of the samples was performed using lab tests to simulate exposure to UV radiation for two years. The solar reflectance of the samples was characterized before and after the accelerated UV aging tests. The results of the aging tests revealed that UV exposure impacts the solar reflectance of the finish material based on the method of integrating the TC paint to the cement plaster. In the case of TC paint applied to the surface, the solar reflectance of the plasters with only the TC is reduced by 15% after aging, while the ones combined with PCMs have a similar solar reflectance value after aging.
+The exterior finish layer in building facades is exposed to considerable environmental loads, which can reduce the service life of the materials, increasing the need for replacement. New climate challenges impose to look more carefully at the long-term performance and durability of building components and materials. Thermal stresses due to daily temperature fluctuations and UV exposure can significantly damage facades and degrade their performance. This research measures the long-term performance of a responsive cementitious finish plaster. The developed cement plaster is combined with phase change materials (PCMs), and thermochromic (TC) pigments to control solar radiation and surface temperatures dynamically on the exterior façade year around. The main objective of the study is to quantify the effect of long-term UV exposure on the optical performance of the cement plasters. PCMs with three different melting temperatures of <math>18^oC</math>, <math>24^oC</math>, and <math>28^oC</math> were combined with two different colors of blue and red TC paint with a transition temperature of <math>31^oC</math>. Accelerated UV aging of the samples was performed using lab tests to simulate exposure to UV radiation for two years. The solar reflectance of the samples was characterized before and after the accelerated UV aging tests. The results of the aging tests revealed that UV exposure impacts the solar reflectance of the finish material based on the method of integrating the TC paint to the cement plaster. In the case of TC paint applied to the surface, the solar reflectance of the plasters with only the TC is reduced by <math>15%</math> after aging, while the ones combined with PCMs have a similar solar reflectance value after aging.
 == Full document ==
 <pdf>Media:Draft_Content_551205787p675.pdf</pdf>

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