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Life Cycle Assessment of Mortars Produced Partially Replacing Cement by Treated Mining Residues
Publication . Almeida, Joana; Faria, Paulina; Ribeiro, Alexandra Branco; Santos Silva, António; DCEA - Departamento de Ciências e Engenharia do Ambiente; CENSE - Centro de Investigação em Ambiente e Sustentabilidade; DEC - Departamento de Engenharia Civil; MDPI - Multidisciplinary Digital Publishing Institute
The use of secondary mining resources to replace conventional constituents in mortars production has proved the effectiveness to preserve the quality of mechanical, physical, and chemical properties. However, minimal research has been performed to quantify the environmental impacts of mortars with mining residues. In the present work, a life cycle assessment of 10 mortars was carried out. A reference mortar (100% of cement binder) and mortars with cement substitutions in 10%, 25%, and 50% by raw, electrodialytic treated, and electrodialytic plus thermal treated mining residues were analysed. The impacts were studied in six environmental categories: (1) abiotic depletion; (2) global warming; (3) ozone depletion; (4) photochemical ozone creation; (5) acidification; and (6) eutrophication potentials. The results demonstrated that mortars formulated with raw mining residues may decrease the environmental impacts, namely in global warming potential (55.1 kg CO2 eq./t modified mortar). Considering the treatments applied to mining residues, the major mitigations were reported in photochemical ozone creation (−99%), ozone depletion (−76 to −98%), and acidification potential (−90 to −94%), mainly due to the disposal impacts avoided in comparison to the reference mortar. Analysing all mortars’ constituents and their management options, products with electrodialytic treated mining residues showed higher influence in ozone depletion (18 to 52%). Coupling a thermal procedure, mining residues contributed for 99% of the abiotic depletion potential of mortars.
Life cycle assessment of mortars
Publication . Santos, Tânia; Almeida, Joana; Silvestre, José D.; Faria, Paulina; DEC - Departamento de Engenharia Civil; CENSE - Centro de Investigação em Ambiente e Sustentabilidade; DCEA - Departamento de Ciências e Engenharia do Ambiente; Elsevier
The in-depth research on efficient processes and alternative constituents for mortars production has a lack on the quantification of their environmental impacts. This work presents a critical review of life cycle assessment (LCA) studies performed in the construction sector, namely related to mortars. The gaps and barriers of these methods and final results are discussed through an overview of the main achievements on mortars’ environmental life cycle studies in Europe. Despite the future trends, LCA studies are more focused on cement-mortars and few researches on air lime, gypsum or earth mortar binders are reported in the literature.
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Fundação para a Ciência e a Tecnologia
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6817 - DCRRNI ID
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157509