Drying kinetics evaluation of solid red bricks

• Tipo: Artigo em Revista Científica Internacional
• Data: 2015

Autores

Eva Barreira (Autor) FEUP; J. M. P. Q. Delgado (Autor) FEUP; Vasco Peixoto de Freitas (Autor) FEUP

Revista

A Revista está pendente de validação pelos Serviços Administrativos.

Título: Diffusion Foundations

Vol. 3

Páginas: 119-134

Indexação

INSPEC

Classificação Científica

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia civil

FOS: Ciências da engenharia e tecnologias > Engenharia civil

Outras Informações

ID Authenticus: P-00S-W0V

DOI: 10.4028/www.scientific.net/DF.3.119

Abstract (EN): Moisture is one of the most deteriorating factors of buildings. The moisture content depends on hygroscopic equilibrium between buildings materials and environment, which is determined by the drying and wetting rate of masonry. So, the moisture content is not only determined by the water that is absorbed by the material, but also by the amount of water that is evaporated under favourable conditions, which is described by the drying process.This work presents the results of an experimental evaluation of the drying kinetics of solid red brick, considering the bulk moisture transfer. The drying kinetics was assessed considering different environment conditions (air temperature and humidity). The experimental results showed that the drying flux is extremely dependent of temperature and relative humidity in the first stage of the drying process. The values obtained were between 0.025 kg/m²h (T=15oC and RH=80%) and 0.135 kg/m²h (T=30oC and RH=50%), for the worst and better drying ambient conditions.Different first-order kinetics models, available in the literature, were adjusted to describe the drying process and estimate the equilibrium moisture content of the samples. The results point that Midilli et al. model allows the best fit and that the drying time constant is strongly affected by the drying air conditions. It was also estimated the apparent molecular diffusion coefficient for solid red brick samples and its variation with temperature.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 16