Accelerated climate ageing of building materials, components and structures in the laboratory

Jelle, Bjørn Petter

doi:10.1007/s10853-012-6349-7

Cited by 115 publications

(110 citation statements)

References 77 publications

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“…Ultimately, one may hope that a working solution will be found within a reasonable time frame. It is also crucial that the specific materials and solutions exhibit a satisfactory durability with respect to various climate exposures, thus accelerated ageing experiments in the laboratory may be beneficial to carry out (Jelle [37]). …”

Section: Further Workmentioning

confidence: 99%

The challenge of removing snow downfall on photovoltaic solar cell roofs in order to maximize solar energy efficiency—Research opportunities for the future

Jelle

2013

Energy and Buildings

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The challenge of removing snow downfall on photovoltaic solar cell roofs, also including solar thermal panels and walls, in order to maximize the solar energy efficiency, is investigated. A special emphasis is given on possible research opportunities for the future. As the application of building integrated photovoltaic (BIPV) products is increasing, it is becoming more important to solve this challenge in order to maximize the solar energy harvesting from buildings. In addition, a solution within this field, may also be utilized in other areas, e.g. for window roofs and traffic signs which are often concealed by snow and ice. Various ideas and possible steps towards a solution of the challenge are discussed, which may then in turn set in motion creative thinking and problem solving paths with new follow-up investigations. Several aspects with snow covering solar panels are treated and discussed, including possible paths towards a working solution. Furthermore, this work presents the compilation and discussion of an experimental method for measuring friction between snow/ice and various building roof surfaces. Some results from these experimental investigations are discussed, including a slip angle and a friction coefficient classification system for roofing types and material surfaces with respect to snow and ice.

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Section: Further Workmentioning

confidence: 99%

The challenge of removing snow downfall on photovoltaic solar cell roofs in order to maximize solar energy efficiency—Research opportunities for the future

Jelle

2013

Energy and Buildings

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“…Accelerated weathering testers are commonly used as they provide results more quickly (i.e., UV degradation is accelerated compared to natural conditions) and are more economically viable than extensive outdoor exposure experiments [19]. However, the data are relative because it is theoretically impossible to have a single conversion number to calculate the years of outdoor hours from the UV-exposed hours in the UV chamber [20].…”

Section: Uv Aging Chambermentioning

confidence: 99%

“…However, the data are relative because it is theoretically impossible to have a single conversion number to calculate the years of outdoor hours from the UV-exposed hours in the UV chamber [20]. The experiments were performed with fluorescent UV-340 lamps because they simulate sunlight in the region of the spectrum that causes most polymer damage (295-365 nm) [19]. The UVA-340 lamps were operated at 0.85 W/m 2 /nm.…”

Section: Uv Aging Chambermentioning

confidence: 99%

Exploring the Use of Unprocessed Waste Chicken Eggshells for UV-Protective Applications

2017

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Photodegradation causes a steady loss of the useful physical, mechanical and optical properties of materials, necessitating their replacement over time. Because UV (Ultraviolet) light is most harmful in this regard, many materials now contain UV-protective additives. However, these additives are not always effective and durable, can be expensive, and their natural extraction or synthetic production can be harmful to the environment. Here, we investigated the use of unprocessed chicken eggshells in providing UV protection to two commonly used synthetic polymers: polystyrene and nylon. We show that unprocessed chicken eggshells provide a durable and effective UV protection. Our data sets the stage for future research to find a practical way to use the large amounts of unprocessed chicken eggshell waste as novel, economically appealing and environmentally friendly UV-protective additives.

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“…Attenuated total reflection (ATR) Fourier transform infrared (FTIR) spectroscopy is a non-destructive technique that has been successfully employed in characterisation of polymer structures and of polymer and wood degradation (Feist and Hon, 1984;Himmelsbach et al, 2006;Jelle et al, 2008;Jelle and Nilsen, 2011;Jelle et al, 2012;Jelle, 2012;Jelle, 2013;Korner et al, 1992;Rodrigues et al, 1998). Common FTIR bands for wood are provided in Table 1 (Faix, 1986;Faix, 1988;Feist and Hon, 1984;Himmelsbach et al, 2006;Hinterstoisser and Salmen, 1999;Jelle et al, 2008;Korner et al, 1992;Lewin and Goldstein, 1991;Pandey and Pitman, 2003;Robotti et al, 2007;Tolvaj and Faix, 1995).…”

Section: Introductionmentioning

confidence: 99%

Wood facade materials ageing analysis by FTIR spectroscopy

Gupta

Jelle

Gao

2015

Proceedings of the Institution of Civil Engineers - Constructio

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Attenuated total reflection Fourier transform infrared spectroscopy is used in this study to quantify wood degradation. Nine different types of wood materials were studied. All types of wood were exposed in an Atlas solar simulator against artificial climate conditions. Additionally, natural climate exposure was performed for all types of wood at an outdoor test site in Trondheim, Norway, for 4 years. Surface treatment enhanced the durability of the wood and their performance against weathering. Rough surfaces might reduce the resistance against degradation in comparison with planed surfaces. The degradation during climate exposure created loss of lignin and accumulation of cellulose at the surface.

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Accelerated climate ageing of building materials, components and structures in the laboratory

Cited by 115 publications

References 77 publications

The challenge of removing snow downfall on photovoltaic solar cell roofs in order to maximize solar energy efficiency—Research opportunities for the future

The challenge of removing snow downfall on photovoltaic solar cell roofs in order to maximize solar energy efficiency—Research opportunities for the future

Exploring the Use of Unprocessed Waste Chicken Eggshells for UV-Protective Applications

Wood facade materials ageing analysis by FTIR spectroscopy

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