OPTIMIZING CALCINATION CONDITIONS OF CORN COB ASH FOR PARTIAL REPLACEMENT OF PORTLAND CEMENT IN CONCRETES
Abstract
The use of agro-industrial residues as supplementary cementitious materials contributes to environmental sustainability and optimized resource use in concrete production. This study evaluates the pozzolanic potential of corn cob ash (CCA) produced under different thermal conditions. Corn cobs were calcined at 650 °C, 750 °C, and 850 °C for durations of 2 and 4 hours. The ashes were characterized through physical tests, including specific gravity, fineness, particle size distribution, and loss on ignition, as well as chemical and mineralogical analyses by X-ray fluorescence and X-ray diffraction. CCA calcined at 750 °C for 2 hours exhibited the most favorable properties, with the highest specific gravity (2.87 g/cm³) and a more suitable particle size distribution. This condition resulted in a higher amorphous content, identified by broader halos in XRD patterns, a feature associated with enhanced pozzolanic reactivity. In contrast, ashes calcined at 850 °C showed increased crystallinity and reduced fineness, indicating lower pozzolanic potential. XRF analysis revealed high SiO₂ contents in all ashes, meeting the requirements for pozzolanic materials (SiO₂ + Al₂O₃ + Fe₂O₃ ≥ 73%). Although the ash produced at 750 °C for 2 hours did not fully meet the fineness criterion (<15% retained on the 75 µm sieve), it presented a value close to the acceptable limit (19.9%). Overall, this calcination condition provided the best balance for using CCA as a pozzolanic material.
Author Biographies
Graduanda em Engenharia Civil, Instituto Federal do Tocantins (IFTO).
Universidade de Brasília (UnB), Programa de Pós-Graduação em Estruturas e Construção Civil (PECC).
Professor do curso de Engenharia Civil, Instituto Federal do Tocantins (IFTO).
Universidade de Brasília (UnB), Programa de Pós-Graduação em Estruturas e Construção Civil (PECC).
Universidade de Brasília (UnB), Programa de Pós-Graduação em Estruturas e Construção Civil (PECC).
References
ADESANYA, D. A.; RAHEEM, A. A. Characterization of corn cob ash (CCA) and groundnut shell ash (GSA) as pozzolana. Journal of Minerals and Materials Characterization and Engineering, v. 7, n. 2, p. 93–101, 2008 DOI: https://doi.org/10.4236/jmmce.2008.72008 DOI: https://doi.org/10.4236/jmmce.2008.72008
ADESANYA, D. A.; RAHEEM, A. A. Development of corn cob ash blended cement. Construction and Building Materials, v. 23, n. 1, p. 347–352, 2009 DOI: https://doi.org/10.1016/j.conbuildmat.2007.11.013 DOI: https://doi.org/10.1016/j.conbuildmat.2007.11.013
ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS. NBR 11579: Cimento Portland – Determinação da finura por meio da peneira 75 µm. Rio de Janeiro: ABNT, 1991.
ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS. NBR 12653: Materiais pozolânicos – Requisitos. Rio de Janeiro: ABNT, 2014.
ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS. NBR 7181: Solo – Análise granulométrica. Rio de Janeiro: ABNT, 2018.
ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS. NBR NM 18: Análise química – Determinação de perda ao fogo. Rio de Janeiro: ABNT, 2012.
COMPANHIA NACIONAL DE ABASTECIMENTO (CONAB). Acompanhamento da Safra Brasileira: Safra 2021/22: décimo primeiro levantamento. Brasília: CONAB, 2022. v. 9.
DESAI, J. Experimental study on corn cob ash powder as partial replacement of cement in concrete. International Research Journal of Engineering and Technology, v. 5, n. 6, p. 724–728, 2018.
FIEGENBAUM, F. A. Cinzas de biomassa como material pozolânico: avaliação da influência das características químicas, mineralógicas e morfológicas. 2020. Tese (Doutorado) – Universidade Federal do Rio Grande do Sul, Porto Alegre, 2020.
GÖTZE, J.; PAN, Y.; MÜLLER, A. Mineralogy and mineral chemistry of quartz: A review. Mineralogical Magazine, v. 85, n. 5, p. 639–664, 2021 DOI: https://doi.org/10.1180/mgm.2021.48 DOI: https://doi.org/10.1180/mgm.2021.72
JEFFRIES, D. F. Pozzolanas – Their properties and use in concrete. Cement and Concrete Composites, v. 12, n. 3, p. 165–170, 1990 DOI: https://doi.org/10.1016/0958-9465(90)90007-F
KOMALPREET SINGH, K.; KUMAR, R.; BANSAL, P. A sustainable environmental study on corn cob ash subjected to elevated temperature. Current World Environment, v. 13, n. 1, p. 144–150, 2017. DOI: https://doi.org/10.12944/CWE.13.1.13
MADSEN, I. C.; SCARLETT, N. V. Y.; KERN, A. Description and survey of methodologies for the determination of amorphous content via X-ray powder diffraction. Zeitschrift für Kristallographie – Crystalline Materials, v. 226, n. 12, p. 944–955, 2011 DOI: https://doi.org/10.1524/zkri.2011.1437 DOI: https://doi.org/10.1524/zkri.2011.1437
MOTA, M. C. R. Avaliação do uso de cinza de sabugo de milho como adição mineral ao cimento Portland. 2020. Dissertação (Mestrado) – Universidade Federal de Goiás, Goiânia, 2020.
NNOCHIRI, E. S. Effect of corn cob ash on lime stabilized lateritic soil. Journal of Civil Engineering, Special Issue, p. 73–85, 2018 DOI: https://doi.org/10.1515/sspjce-2018-0007 DOI: https://doi.org/10.1515/sspjce-2018-0007
OLUBORODE, O. O.; OLOFINTUYI, O. A. Pozzolanic potentials of corn cob ash. Journal of Emerging Trends in Engineering and Applied Sciences, v. 2, n. 3, p. 561–564, 2011.
RRUFF DATABASE. Quartz – SiO₂ (ID: R100134). Disponível em: https://rruff.info/quartz/R100134
SCRIVENER, K.; SNELLINGS, R.; LOTHENBACH, B. A practical guide to microstructural analysis of cementitious materials. Boca Raton: CRC Press, 2016.
SEGAL, L.; CREELY, J. J.; MARTIN JR., A. E.; CONRAD, C. M. An empirical method for estimating the degree of crystallinity of native cellulose using the X-ray diffractometer. Textile Research Journal, v. 29, n. 10, p. 786–794, 1959 DOI: https://doi.org/10.1177/004051755902901003 DOI: https://doi.org/10.1177/004051755902901003
SUWANMANEECHOT, P.; NOCHAIYA, T.; JULPHUNTHONG, P. Improvement, characterization and use of waste corn cob ash in cement-based materials. IOP Conference Series: Materials Science and Engineering, v. 103, n. 1, p. 012023, 2015 DOI: https://doi.org/10.1088/1757-899X/103/1/012023 DOI: https://doi.org/10.1088/1757-899X/103/1/012023
UDOEYO, F. F.; ABUBAKAR, S. A. Characteristics of maize cob ash blended cement. Construction and Building Materials, v. 19, n. 8, p. 570–576, 2005.
UDOEYO, F. F.; ABUBAKAR, S. A. Maize-cob ash as filler in concrete. Journal of Materials in Civil Engineering, v. 15, n. 2, p. 205–208, 2003 DOI: https://doi.org/10.1061/(ASCE)0899-1561(2003)15:2(205) DOI: https://doi.org/10.1061/(ASCE)0899-1561(2003)15:2(205)
VAZ JUNIOR, S. Utilization of agro-industrial residues: A sustainable approach. Brasília: Embrapa Agroenergy, 2020. (Documents No. 31).
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