Características de durabilidade em concretos usando rejeito de minério de ferro em substituição da areia
DOI:
https://doi.org/10.46421/enarc.v9i1.6891Palavras-chave:
Rejeito de minério de ferro, concreto, durabilidade, distribuição de poros, migração de íons cloretoResumo
Este estudo investigou o impacto da substituição de areia por rejeito de minério de ferro (RMF) no concreto, focando na permeabilidade a íons cloreto (PIC), porosidade e distribuição de poros (DP). Foram analisados concretos com substituições de 0%, 30% e 50% de RMF, denominados CRMF0, CRMF30 e CRMF50, respectivamente. Os resultados mostraram que o teor de substituição afeta as propriedades de resistência e durabilidade do concreto. CRMF30 apresentou redução da porosidade e aumento da resistência à compressão, mas elevação da PIC devido ao crescimento de grandes poros. O CRMF50 apresentou desempenho geral próximo ao CRMF0, com baixa PIC e redução moderada na resistência mecânica. A análise de DP por fotogrametria destacou-se como ferramenta eficaz para compreender os efeitos da adição de RMF na microestrutura do concreto. Ajustes nos aditivos e na granulometria do RMF são recomendados para equilibrar resistência e durabilidade, promovendo a aplicação sustentável desse resíduo na construção civil.
Referências
ABCP. Método de dosagem de concreto. Disponível em: <https://abcp.org.br/wp-content/uploads/2020/07/Metodo_Dosagem_Concreto_ABCPonLINE_22.07.2020.pdf>. Acesso em: 15 ago. 2020.
ABNT. NBR 12655, Portland cement concrete - Preparation, control, receipt and acceptance - Procedure. . Brazil: [s.n.]. , 2015
ABNT. NBR 9778: Argamassa e concreto endurecidos - Determinação da absorção de água, índice de vazios e massa específica. . Brasil: [s.n.]. , 2005
ARBILI, M. M. et al. Concrete Made with Iron Ore Tailings as a Fine Aggregate: A Step towards Sustainable Concrete. Materials, v. 15, n. 18, 2022.
BORGES, P. H. R. et al. Reuse of iron ore tailings in the production of geopolymer mortars. Revista Escola de Minas, v. 72, n. 4, p. 581–587, 2019.
CHEN, Y. et al. Evaluation and optimization of Ultra-High Performance Concrete (UHPC) subjected to harsh ocean environment: Towards an application of Layered Double Hydroxides (LDHs). Construction and Building Materials, v. 177, p. 51–62, 2018.
EL-DIEB, A. S. Mechanical, durability and microstructural characteristics of ultra-high-strength self-compacting concrete incorporating steel fibers. Materials and Design, v. 30, n. 10, p. 4286–4292, 2009.
FRANÇA, S. et al. The durability of alkali-activated mortars based on sugarcane bagasse ash with different content of Na2O. Journal of Building Pathology and Rehabilitation, v. 8, n. 2, 2023.
HUANG, J. et al. Evaluation of pore size distribution and permeability reduction behavior in pervious concrete. Construction and Building Materials, v. 290, 2021.
HUANG, X. et al. Development of green engineered cementitious composites using iron ore tailings as aggregates. Construction and Building Materials, Compilation and indexing terms, Copyright 2020 Elsevier Inc., v. 44, p. 757–764, 2013. Disponível em: <http://dx.doi.org/10.1016/j.conbuildmat.2013.03.088>.
HUANG, X.; RANADE, R.; LI, V. C. Feasibility Study of Developing Green ECC Using Iron Ore Tailings Powder as Cement Replacement. Journal of Materials in Civil Engineering, v. 25, n. 7, p. 923–931, 2013.
LI, J. et al. Durability of ultra-high performance concrete – A review. Construction and Building Materials, v. 255, 2020.
LIU, K. et al. Effect of iron ore tailings industrial by-product as eco-friendly aggregate on mechanical properties, pore structure, and sulfate attack and dry-wet cycles resistance of concrete. Case Studies in Construction Materials, v. 17, 2022.
MA, Z. et al. Characterization of sustainable mortar containing high-quality recycled manufactured sand crushed from recycled coarse aggregate. Cement and Concrete Composites, v. 132, 2022.
MANDAL, R.; PANDA, S. K.; NAYAK, S. Rheology of Concrete: Critical Review, recent Advancements, and future prospectives. Construction and Building Materials, v. 392, 2023.
METHOD, N. BUILD 492 1 NT BUILD 492 - Concrete, Mortar and Cement-Based Repair Materials: Chloride Migration Coefficient from Non-Steady-State Migration Experiments. . Finland: [s.n.]. , 1999
RABBANI, A.; JAMSHIDI, S.; SALEHI, S. An automated simple algorithm for realistic pore network extraction from micro-tomography images. Journal of Petroleum Science and Engineering, v. 123, p. 164–171, 2014.
RAMOS, L. T. DA S.; MOURÃO, A. B.; et al. Durabilidade de concretos produzidos com substituição de areia por rejeito de minério de ferro. 2024, Maceió - AL: ANTAC, 2024. Disponível em: <https://eventos.antac.org.br/index.php/entac/article/view/5921>.
RAMOS, L. T. DA S.; DE AZEVEDO, R. C.; et al. Iron ore tailings as a new product: A review-based analysis of its potential incorporation capacity by the construction sector. Cleaner Waste Systems, v. 7, 2024.
RECENA, F. A. P. Retração do Concreto. 1. ed. Porto Alegre: EDIPUCRS, 2023.
REIS, E. D. et al. Assessment of physical and mechanical properties of concrete with carbon nanotubes pre-dispersed in cement. Journal of Building Engineering, v. 89, 2024.
SHETTIMA, A. U. et al. Evaluation of iron ore tailings as replacement for fine aggregate in concrete. Construction and Building Materials, v. 120, p. 72–79, 2016a.
SHETTIMA, A. U. et al. Evaluation of iron ore tailings as replacement for fine aggregate in concrete. Construction and Building Materials, v. 120, p. 72–79, 2016b. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0950061816308273>.
WANG, Y. B. et al. Experimental study of ultra-high-strength concrete under triaxial compression. ACI Materials Journal, v. 113, n. 1, p. 105–112, 2016.
WEISHI, L. et al. The properties and formation mechanisms of eco-friendly brick building materials fabricated from low-silicon iron ore tailings. Journal of Cleaner Production, v. 204, p. 685–692, 2018.
WU, H. et al. Micro-macro characterizations of mortar containing construction waste fines as replacement of cement and sand: A comparative study. Construction and Building Materials, v. 383, 2023.
YELLISHETTY, M. et al. Reuse of iron ore mineral wastes in civil engineering constructions: A case study. Resources, Conservation and Recycling, v. 52, n. 11, p. 1283–1289, 2008.
ZHANG, W. et al. Effects of iron ore tailings on the compressive strength and permeability of ultra-high performance concrete. Construction and Building Materials, v. 260, 2020.
ZHANG, Z. et al. Utilization of iron tailings sand as an environmentally friendly alternative to natural river sand in high-strength concrete: Shrinkage characterization and mitigation strategies. Materials, v. 13, n. 24, p. 5614, 2020.
ZHAO, S.; FAN, J.; SUN, W. Utilization of iron ore tailings as fine aggregate in ultra-high performance concrete. Construction and Building Materials, v. 50, p. 540–548, 2014.