|
authors |
De Rossi, A; Carvalheiras, J; Novais, RM; Ribeiro, MJ; Labrincha, JA; Hotza, D; Moreira, RFPM |
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nationality |
International |
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journal |
CONSTRUCTION AND BUILDING MATERIALS |
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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. |
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publisher |
ELSEVIER SCI LTD |
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issn |
0950-0618 |
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year published |
2018 |
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volume |
191 |
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beginning page |
39 |
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ending page |
46 |
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digital object identifier (doi) |
10.1016/j.conbuildmat.2018.09.201 |
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web of science category |
Construction & Building Technology; Engineering, Civil; Materials Science, Multidisciplinary |
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subject category |
Construction & Building Technology; Engineering; Materials Science |
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unique article identifier |
WOS:000451105100005
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