Upcycling unexplored dregs and biomass fly ash from the paper and pulp industry in the production of eco-friendly geopolymer mortars: A preliminary assessment
authors Novais, RM; Carvalheiras, J; Senff, L; Labrincha, JA
nationality International
journal CONSTRUCTION AND BUILDING MATERIALS
author keywords Green liquor dregs; Biomass fly ash; Inorganic polymer; Calorimetry; Mechanical resistance
keywords MECHANICAL-PROPERTIES; STRUCTURAL-ANALYSIS; WASTE MANAGEMENT; ACTIVATION; SLAG; IMMOBILIZATION; METAKAOLIN; RESPECT; BLENDS; PASTE
abstract Green liquor dregs wastes coming from pulp and paper production are currently disposed in landfills at a huge cost for industry and the environment. In this work, a novel and more sustainable waste management strategy is proposed. Dregs were used for the first time as fine filler in the production of biomass fly ash-based geopolymeric mortars. The influence of the dregs incorporation amount on the fresh (geopolymer kinetics and mortars workability) and hardened-state (mechanical resistance, water absorption and capillary water absorption) properties of the mortars was evaluated. Although dregs incorporation reduce the flow workability (up to 19%), their presence and amount did not significantly alter the geopolymerization kinetics. Additionally dregs-containing mortars exhibited enhanced tensile (up to 71%) and compressive strength (up to 34%), and lower water absorption in comparison with the reference mortar. These results demonstrate the feasibility of using dregs as fine filler in geopolymers production. Moreover the mortars were produced using mainly biomass fly ash waste as aluminosilicate source which further reduces the environmental impact of the pulp and paper industry. (C) 2018 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0950-0618
year published 2018
volume 184
beginning page 464
ending page 472
digital object identifier (doi) 10.1016/j.conbuildmat.2018.07.017
web of science category Construction & Building Technology; Engineering, Civil; Materials Science, Multidisciplinary
subject category Construction & Building Technology; Engineering; Materials Science
unique article identifier WOS:000443666200043
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journal analysis (jcr 2017):
journal impact factor 3.485
5 year journal impact factor 4.039
category normalized journal impact factor percentile 83.796
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