Production and characterization of pozzolanic ash from green coconut shell biomass

Autor: Oliveira, Mateus Ferreira de, https://orcid.org/0000-0002-2617-4485
Přispěvatelé: Andrade, Jean Carlos Silva, Paiva, Samantha Pinheiro, Melo Filho, Jo??o de Almeida, Ribas, Luciane Farias
Jazyk: portugalština
Rok vydání: 2021
Předmět:
Zdroj: Biblioteca Digital de Teses e Dissertações da UFAM
Universidade Federal do Amazonas (UFAM)
instacron:UFAM
Popis: Submitted by Mateus Oliveira (oliveirafmateus@hotmail.com) on 2021-12-31T13:42:26Z No. of bitstreams: 4 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Disserta????o_Mateus Ferreira de Oliveira_PPGCEM.pdf: 4185647 bytes, checksum: 1ad630a8d9a8be7dd2ad1fbb17749a6b (MD5) 2. Carta Encaminhamento-DISSERTA????O__Mateus Oliveira (2021.2)-assinado.pdf: 116090 bytes, checksum: 5a69735eae08c2689a80a9c595ef9a9d (MD5) 3. ATA DE DEFESA DA DISSERTA????O_Mateus Ferreira de Oliveira-assinado.pdf: 300920 bytes, checksum: 7495e2abc183c346f5af4b4f7e6ff12a (MD5) Approved for entry into archive by PPGCEM Ci??ncia e Engenharia de Materiais (ppgcem@ufam.edu.br) on 2022-01-04T13:29:22Z (GMT) No. of bitstreams: 4 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Disserta????o_Mateus Ferreira de Oliveira_PPGCEM.pdf: 4185647 bytes, checksum: 1ad630a8d9a8be7dd2ad1fbb17749a6b (MD5) 2. Carta Encaminhamento-DISSERTA????O__Mateus Oliveira (2021.2)-assinado.pdf: 116090 bytes, checksum: 5a69735eae08c2689a80a9c595ef9a9d (MD5) 3. ATA DE DEFESA DA DISSERTA????O_Mateus Ferreira de Oliveira-assinado.pdf: 300920 bytes, checksum: 7495e2abc183c346f5af4b4f7e6ff12a (MD5) Approved for entry into archive by Divis??o de Documenta????o/BC Biblioteca Central (ddbc@ufam.edu.br) on 2022-01-04T18:36:53Z (GMT) No. of bitstreams: 4 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Disserta????o_Mateus Ferreira de Oliveira_PPGCEM.pdf: 4185647 bytes, checksum: 1ad630a8d9a8be7dd2ad1fbb17749a6b (MD5) 2. Carta Encaminhamento-DISSERTA????O__Mateus Oliveira (2021.2)-assinado.pdf: 116090 bytes, checksum: 5a69735eae08c2689a80a9c595ef9a9d (MD5) 3. ATA DE DEFESA DA DISSERTA????O_Mateus Ferreira de Oliveira-assinado.pdf: 300920 bytes, checksum: 7495e2abc183c346f5af4b4f7e6ff12a (MD5) Made available in DSpace on 2022-01-04T18:36:53Z (GMT). No. of bitstreams: 4 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Disserta????o_Mateus Ferreira de Oliveira_PPGCEM.pdf: 4185647 bytes, checksum: 1ad630a8d9a8be7dd2ad1fbb17749a6b (MD5) 2. Carta Encaminhamento-DISSERTA????O__Mateus Oliveira (2021.2)-assinado.pdf: 116090 bytes, checksum: 5a69735eae08c2689a80a9c595ef9a9d (MD5) 3. ATA DE DEFESA DA DISSERTA????O_Mateus Ferreira de Oliveira-assinado.pdf: 300920 bytes, checksum: 7495e2abc183c346f5af4b4f7e6ff12a (MD5) Previous issue date: 2021-11-30 FAPEAM - Funda????o de Amparo ?? Pesquisa do Estado do Amazonas The cement industry is responsible for a large part of greenhouse gas emissions, especially during clinker production. Studies carried out are unanimous in reporting that cement manufacturing is responsible for about 7% of the total CO2 emissions in the world. Based on this fact, there is the continuous expansion of civil construction, with the consumption of nonrenewable inputs, such as those used in concrete production. Due to these factors, the experimental program present in this work aimed to study the feasibility of producing pozzolanic ashes from the burning of green coconut shell biomass. The proposal of this research was due to the fact that Brazil is the fifth largest producer of coconut in the world and faces problems with the disposal of this agro-industrial residue, causing accumulation in landfills. In addition, there are also the environmental impacts caused by the manufacture of Portland cement. The experimental program began with the collection of coconut, followed by drying the raw material, grinding and chemical processing of the green coconut biomass for the production of chemically treated and untreated ash at 600 ??C, 700 ??C and 800 ??C. Ashes were characterized by laser particle size, X-ray fluorescence, X-ray diffraction, electrical conductivity, Chapelle pozzolanic activity index and BET surface area for the analysis of temperatures where the ash showed reactivity. The results showed that the ash without chemical treatment had undesirable alkali metals for their use as pozzolans. On the other hand, the ash produced after the chemical treatment of coconut exhibited a sum of SiO2, Fe2O3 and Al2O3 greater than 50%, in addition to a loss of ignition less than 6%, classifying them as pozzolanic according to NBR 12653 (ABNT, 2014), except by the SO3 content. By analyzing the pozzolanic activity index data measured by electrical conductivity and modified Chapelle, results were obtained up to 0.945 mS/cm and 1263.09 mg Ca(OH)2, respectively. Such values demonstrate that the material has pozzolanic activity, according to the classification by Lux??n et al. (1989) and Raverdy et al. (1980). Finally, the results of characterization of the leached ash found that there is the feasibility of green coconut husk ash as a mineral addition to the cementitious paste, since it has chemical composition, loss of ignition and Chapelle pozzolanic activity index that are interesting for the application of this as pozzolan A ind??stria do cimento ?? respons??vel por grande parte das emiss??es de gases do efeito estufa, especialmente durante a produ????o de cl??nquer. Estudos realizados s??o un??nimes ao relatar que a fabrica????o de cimento ?? respons??vel por cerca de 7% da emiss??o total de CO2 no mundo. Alicer??ado a este fato, tem-se a cont??nua expans??o da constru????o civil, com o consumo de insumos n??o renov??veis, como os utilizados na produ????o concreto. Por conta destes fatores, o programa experimental presente neste trabalho objetivou estudar a viabilidade da produ????o de cinza pozol??nica a partir da queima da biomassa da casca do coco verde. A proposi????o desta pesquisa deu-se pelo fato do Brasil ser o quinto maior produtor mundial de coco e enfrentar problemas de descarte desse res??duo agroindustrial, causando ac??mulo nos aterros, somado a isto, tem-se ainda os impactos ambientais provocados pela fabrica????o do cimento Portland. O programa experimental iniciou-se com a coleta do res??duo do coco verde, seguido da secagem da mat??ria-prima, moagem e beneficiamento qu??mico da biomassa do coco verde para a produ????o de cinzas tratadas e n??o tratadas quimicamente, a 600 ??C, 700 ??C e 800 ??C. As cinzas foram caracterizadas por granulometria a laser, fluoresc??ncia de raios-X, difra????o de raios-X, condutividade el??trica, ??ndice de atividade pozol??nica Chapelle e ??rea de superf??cie BET para an??lise das temperaturas onde as cinzas apresentassem reatividade. Os resultados mostraram que as cinzas sem tratamento qu??mico possu??am metais alcalinos indesej??veis para a utiliza????o destas como pozolanas. Por outro lado, as cinzas produzidas ap??s o tratamento qu??mico do coco exibiram somat??rio de SiO2, Fe2O3 e Al2O3 maiores que 50%, al??m de perda ao fogo menor que 6%, classificando-as como pozol??nicas conforme a NBR 12653 (ABNT, 2014), exceto pelo teor de SO3, o qual foi 2,5% maior. Ao analisar os dados de ??ndice de atividade pozol??nica mensurados pela condutividade el??trica e por Chapelle modificado, obtiveram-se resultados de at?? 0,945 mS/cm e 1263,09 mg Ca(OH)2, respectivamente. Tais valores demonstram que o material possui atividade pozol??nica, de acordo com a classifica????o de Lux??n et al. (1989) e Raverdy et al. (1980). Por fim, os resultados de caracteriza????o da cinza lixiviada revelaram que h?? a viabilidade da cinza da casca do coco verde como adi????o mineral ?? pasta ciment??cia, uma vez que ela possui composi????o qu??mica, perda ao fogo e ??ndice de atividade pozol??nica Chapelle interessantes ?? aplica????o desta como pozolana.
Databáze: OpenAIRE
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