resumo
In this study, lightweight waste-based geopolymeric mortars were evaluated for the first time regarding their potential to passively adjust indoor relative humidity (RH) levels. Geopolymer mortars were prepared using a mixture of fly ash (FA) and metakaolin (MK) as a binder, in a proportion of 75:25 wt% (FA:MK), construction and demolition waste as the fine aggregate and a pore forming agent in varying amounts. The results showed that the addition of a pore-forming agent to the compositions considerably increased the moisture buffer value (MBV) of the mortars, that is, from 0.80 (reference mortar) to 5.61 g/m2 A%RH (mortar with highest porosity). The moisture buffering capacity shown by these ecofriendly mortars is higher than values reported for other binder materials and can be classified as excellent (MBV > 2 g/m2 A%RFI). The porous FA-based mortars also presented low thermal conductivity (as low as 0.19 W/m"K), which suggests that these innovative binders could be simultaneously used for indoor moisture buffering and as low thermal conductivity materials. (C) 2018 Elsevier Ltd. All rights reserved.
palavras-chave
ASH-BASED GEOPOLYMERS; INDOOR AMBIENT; ADSORPTION; BINDERS; CLIMATE; POWDER
categoria
Construction & Building Technology; Engineering; Materials Science
autores
De Rossi, A; Carvalheiras, J; Novais, RM; Ribeiro, MJ; Labrincha, JA; Hotza, D; Moreira, RFPM
nossos autores
João António de Sousa Carvalheiras
Estudante de doutoramento
João António Labrincha Baptista
Professor Catedrático
Rui Miguel Novais
Professor Auxiliaragradecimentos
This study was conducted within the scope of the project CAPES/FCT 88887.125458/2016-00. The funding agencies CAPES (Brazil) and FCT (Portugal) are gratefully acknowledged.