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Building materials are affected by several aesthetical and functional issues due to ageing processes which can be related to physical, chemical or biological factors (Sleiman et al., 2014). Among these factors, the biological growth represents a phenomenon in addition to physical and chemical problems due to weathering and soiling, which accelerates the fouling process of outdoor materials (Ferrari et al., 2015). Considering Solar Reflective Materials (SRM), biodeterioration process takes part to important performances losses in terms of surface thermal properties, such as solar reflectance and thermal emittance. However, due to its the wide variability bio-deterioration is not yet being completely understood and quantify by the scientific community. Thus, this study is aimed to study biological colonization on building materials in a repeatable and reproducible way, in order to quantify the changes on the surfaces properties due to biological growth. An innovative and laboratory protocol to accelerate biological colonization effects on building surfaces is here presented.

On Bio-Deterioration of Solar Reflective Materials: An Innovative Experimental Procedure to Accelerate the Ageing Process of Surfaces