COATINGS FOR THE BUILDING ENVELOPE AND THE AGING ASSESSMENT OF ABSORPTANCE TO SOLAR RADIATION: proposition of a national method for accelerated aging practice

• Grant number: 24/10060-5
• Support Opportunities: Regular Research Grants
• Start date: November 01, 2024
• End date: October 31, 2027
• Field of knowledge: Applied Social Sciences - Architecture and Town Planning - Architecture and Urbanism Technology
• Principal Investigator: Kelen Almeida Dornelles
• Grantee: Kelen Almeida Dornelles
• Host Institution: Instituto de Arquitetura e Urbanismo de São Carlos (IAU). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Associated researchers: Anna Laura Pisello ; Deivis Luis Marinoski ; Roberto Lamberts ; UMBERTO BERARDI
• Associated scholarship(s): 24/21425-4 - Analysis of the optical properties of coatings for buildings under natural weathering and accelerated practice in laboratory, BP.TT

Abstract

The use of coatings with high solar reflectance for the built environment is an effective measure to contain warming in urban areas, a phenomenon related to climate change, which has been documented through a wide variety of studies. However, these surfaces are exposed to weathering conditions and the continuous deposition of particulate matter (PM) present in the atmosphere, as well as the growth of microorganisms. In countries with a tropical climate, significant changes in surface properties have a direct impact on their temperatures, as well as the thermal an energy performance of buildings. Therefore, this proposal's main objective is to evaluate the degradation of solar absorptance, reflectance, thermal emittance, color, and surface roughness of a wide range of coatings for walls and roofs, based on natural (in the field) and accelerated aging tests (in the laboratory). To achieve this, the research is divided into two main stages: natural aging with exposure of samples at a station located in São Carlos-SP for a minimum period of 18 months, and accelerated aging with laboratory tests according to a procedure standardized by ASTM D7897. For both stages, periodic measurements of the optical and thermal properties of the coatings will be carried out, and the results obtained in the different methods of evaluating the degradation of these properties will be compared. Based on these results, an accelerated aging method in a laboratory suitable for the national reality will be proposed, in an initially local context (city of São Carlos, SP), considering the MP collected in the city. The results of this project are intended to provide support for the discussion and preparation of a future national technical standard that defines procedures for carrying out accelerated degradation tests on the thermal and optical properties of wall and roof coverings. It is also expected to contribute to future studies and the development of a new generation of coatings for the built environment, as well as their effective applicability to the national context, as well as subsidies for research in other locations in the Southern Hemisphere, with similar climatic characteristics to Brazil. (AU)