resumo
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.
palavras-chave
MECHANICAL-PROPERTIES; STRUCTURAL-ANALYSIS; WASTE MANAGEMENT; ACTIVATION; SLAG; IMMOBILIZATION; METAKAOLIN; RESPECT; BLENDS; PASTE
categoria
Construction & Building Technology; Engineering; Materials Science
autores
Novais, RM; Carvalheiras, J; Senff, L; Labrincha, JA
nossos autores
João António de Sousa Carvalheiras
Estudante de doutoramento
João António Labrincha Baptista
Professor Catedrático
Rui Miguel Novais
Professor Auxiliaragradecimentos
This work is financed by Portugal 2020 through European Regional Development Fund (ERDF) in the frame of Operational Competitiveness and Internationalization Programme (POCI) in the scope of the project PROTEUS - POCI-01-0247-FEDER-017729 and in the scope of the project CICECO - Aveiro Institute of Materials CTM/50011 (Compete Reference:POCI-01-0145-FEDER-007679), Associated Laboratory of University of Aveiro, co-financed by Fundacao para a Ciencia e Tecnologia/MCTES.