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Influence of roughness in the reflectance of aged cool surfaces

Grant number: 19/03164-0
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): May 01, 2019
Effective date (End): December 31, 2019
Field of knowledge:Engineering - Civil Engineering - Construction Industry
Principal researcher:Vanderley Moacyr John
Grantee:Lucas Nascimento de Lima
Home Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil


The increase of air temperature in the cities, due to the urban heat islands phenomena make the demanded of electricity for air conditioning higher. Looking for reduce this energy consumption, were developed materials with characteristics as high reflectance and high emittance, known as cool surfaces. Due the lost of reflectance by external agents, this paper aims to verify the relationship between the increase in roughness by microbial growth and the lost of reflectance in cool paints. For that, will be made tests for reflectance analysis with a portable reflectometer, digital microscopy to evaluate the biofilm and roughness analysis in the following situations: after 3 years of exposure, after washing with hydro blasting and in not exposed samples. These tests will be made in samples exposed for 3 years by the Brazilian Consortium of Cool Surfaces in 3 cities: São Paulo - SP, Pirassununga - SP and Belém - PA.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SHIRAKAWA, MARCIA AIKO; DE LIMA, LUCAS NASCIMENTO; GAYLARDE, CHRISTINE; FERNANDES-HACHICH, VERA; SILVA JUNIOR, JOAO DE ATHAYDES; JOHN, VANDERLEY MOACYR. The influence of environment and carbonation of fiber cement tiles on the reflectance of a cool surface exposed in four Brazilian cities. ENERGY AND BUILDINGS, v. 254, JAN 1 2022. Web of Science Citations: 0.

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