Waste-based geopolymeric mortars with very high moisture buffering capacity
authors De Rossi, A; Carvalheiras, J; Novais, RM; Ribeiro, MJ; Labrincha, JA; Hotza, D; Moreira, RFPM
nationality International
journal CONSTRUCTION AND BUILDING MATERIALS
author keywords Geopolymeric mortar; Biomass fly ash; Construction and demolition waste; Pore forming agent; Porosity; Moisture buffering
keywords ASH-BASED GEOPOLYMERS; INDOOR AMBIENT; ADSORPTION; BINDERS; CLIMATE; POWDER
abstract 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.
publisher ELSEVIER SCI LTD
issn 0950-0618
year published 2018
volume 191
beginning page 39
ending page 46
digital object identifier (doi) 10.1016/j.conbuildmat.2018.09.201
web of science category Construction & Building Technology; Engineering, Civil; Materials Science, Multidisciplinary
subject category Construction & Building Technology; Engineering; Materials Science
unique article identifier WOS:000451105100005
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5 year journal impact factor 4.039
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