Cinzas de biomassa geradas na agroindústria do cacau: caracterização e uso em substituição ao cimento

Silva, Rebeca Bastos; Fontes, Cintia Maria Ariani; Lima, Paulo Roberto Lopes; Gomes, Otávio da Fonseca Martins; Lima, Lilian Graicy Lima Morais; Moura, Ruan Carlos de Araújo; Filho, Romildo Dias Tolêdo

doi:10.1590/s1678-86212015000400053

Cited by 12 publications

(7 citation statements)

References 20 publications

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“…By analyzing the effects of the chemical attack on the volumetric density, it is observed that the P-value (0.000 and 0.003) underlined and in bold in the table 2 becomes statistically significant the main factors, especially the interaction did not show statistically significant results. The figure 8, shows that materials with lower mass replacement by the SBA cement, have presented higher densities when compared to composites of higher amounts of analyzed replacement fraction, this result is analogous to that reported in bibliography [13], which attributes this decrease to increased levels of voids and the relative density of the ash towards the cement. This behavior is similar to that observed in the volumetric density of the composites before the chemical attack.…”

Section: Bulk Density After Chemical Attacksupporting

confidence: 81%

Effect of the chemical attack on the properties of cimentititous composites with partial substitution of ash from sugar cane bagasse in natura

et al. 2017

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Seeking the reutilization of waste from agriculture and urban sources, studies have presented an option in the inclusion of such waste into new low-cost materials that are environmentally viable. One possibility is the reutilization of sugarcane bagasse ashes (SBA), the final waste in the productive process of the Brazilian alcohol sector. In addition to the behavior of materials with the use of SBA as additions in cement-based materials under normal environmental conditions, the study of the behavior of these materials when exposed to harsh environments is required. Thus, this project evaluated the properties, the compression strength and the bulk density of cement composites with partial replacement of cement by SBA without prior treatment. Also, it analyzed the weight loss and compressive strength of the composites subjected to environments with the presence of chloride ions. A factorial design was adopted to verify the influence of the addition of SBA (5wt%, 10wt% and 15wt%) and water/cement ratio (0.45 and 0.55) in the studied properties. The interaction between the factors was significant. The values obtained from the compressive strength of the manufactured composites showed that it is possible to replace up to 15wt% of cement for in natura SBA. After a chemical attack with an acid solution of HCl 30%, it could be observed that all materials had a lower compressive strength, which can be explained by the high weight loss suffered by all composites. Based on the results of compressive resistance, density and weight loss after the attack, it was observed that the mechanical behavior of the composites in relation to the referential conditions were similar. This study showed that it is feasible, in accordance to the studied properties, to use these composites in promoting the partial replacement of cement by this type of waste and its reutilization.

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Section: Bulk Density After Chemical Attacksupporting

confidence: 81%

Effect of the chemical attack on the properties of cimentititous composites with partial substitution of ash from sugar cane bagasse in natura

et al. 2017

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“…Nas conclusões de REIS [35] também foi relatado que o elevado teor de CG parece criar maiores dimensões de poros, sugerindo intertravamentos, devido à forma lamelar e alongada dos grãos. Ainda, nos estudos de SILVA et al [1] foram avaliados teores de cinzas de biomassa como aglomerante a 5%, mostrando aumento na absorção de água, com manutenção das propriedades mecânicas. ALCÂNTARA [44] relatou que o material fino pode influenciar a absorção, e verificou que esta caiu para cerca de 3% em média, quando as cinzas foram aplicadas em teor de 35% em relação à massa do cimento.…”

Section: Permeabilidade Dos Compósitosunclassified

“…A partir da pirólise de biomassa são produzidas cinzas, cujas origens estão na combustão de resíduos de madeiras, bagaço de cana-de-açúcar, casca de arroz, além de outros resíduos agroflorestais como cacau, coco, bambu, capim, etc [1][2][3].…”

Section: Introductionunclassified

Desempenho mecânico e durabilidade de argamassas contendo adições de resíduos de carvão vegetal amazônico

Ribeiro¹,

Souza²,

Grondona

et al. 2021

Matéria (Rio J.)

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RESUMO Este artigo analisou o desempenho físico-mecânico de argamassas cimentícias contendo adições de cinza granulada de biomassa oriunda de resíduos de carvão vegetal amazônico. Como aglomerante suplementar, foram substituídos teores de 0%, 5% e 10% em massa do aglomerante principal (cimento Portland). Foram observados e comparados aspectos de durabilidade e desempenho mecânico entre os compósitos. Para isso, foram selecionadas matérias primas – subprodutos da indústria madeireira, areia de rio (f 2,36 mm), cinza granulada (CG) de carvoaria (f 75 µm) e o cimento CP II – F 40. Corpos de prova cilíndricos 50x100 mm foram confeccionados com argamassas das misturas. Análise termogravimétrica (TG/DTG) sobre a CG foi desenvolvida. O compósito cimentício em estado endurecido foi analisado nos aspectos de volume de vazios, absorção de água total e por capilaridade, perda de massa a 950° C, resistências à tração diametral e resistência à compressão axial. Os resultados mostraram queda no desempenho mecânico dos compósitos com adição de 5%. O compósito com 10% de CG apresentou o melhor desempenho geral, porém, indicou tendência a queda na durabilidade, a partir das idades avançadas.

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“…In 2014, it was estimated that the state of Bahia, alone, generated approximately 16.2 thousand tons of cocoa almond peels (CAP). Indeed, 80-120 kg of the waste from CAP are produced from every 1,000 kg of cocoa almonds with 7% humidity (SILVA et al, 2015). Fruit peels are the main waste produced by the industrial processing of cocoa almonds to obtain the liquor (raw material to make chocolate).…”

Section: Abstract: Oyster Mushroom; Fungal Protein;mentioning

confidence: 99%

Biological efficiency and nutritional value of Pleurotus ostreatus cultivated in agroindustrial wastes of palm oil fruits and cocoa almonds

Silva

Carmo

Oliveira³

et al. 2020

Arq. Inst. Biol.

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The cocoa and palm oil agro-industries active in the state of Bahia, Brazil, generate high quantities of lignocellulosic wastes that could be recycled through their use in the formulation of substrates to cultivate edible mushrooms. Pleurotus ostreatus, also known as oyster mushroom, is the second most cultivated mushroom in the world due to its highly appreciated gastronomic, nutritional, and medicinal characteristics. This work evaluated the vertical mycelium growth, biological efficiency, mushroom yield, and nutritional composition of P. ostreatus produced in substrates formulated with a combination of palm oil fruit mesocarp (POFM) and cocoa almond peels (CAP) processing wastes. The substrates were formulated with the following POFM/CAP proportions (%/%): S1 – 86.4/9.6; S2 – 76.8/19.2; S3 – 67.2/28.8; S4 – 57.6/38.4, and S5 – 48.0/48.0. Substrates also received 3% powdered charcoal and 1% calcium carbonate. Substrates S1, S2, S3, and S4 were superior for vertical mycelium growth. S2 promoted the best biological efficiency (148.8%) and yield (560.5g·kg-1).The mushrooms produced in all substrates presented good nutritional values, although mushrooms produced using the S2 presented the highest crude protein content. Overall, S1 is the recommended substrate as it results in higher yields of nutrient rich mushrooms. Production of P. ostreatus in substrates composed of POFM and CAP represents a good alternative for recycling these wastes with potential economic and ecological benefits to regions where palm oil and cocoa are grown.

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Cinzas de biomassa geradas na agroindústria do cacau: caracterização e uso em substituição ao cimento

Cited by 12 publications

References 20 publications

Effect of the chemical attack on the properties of cimentititous composites with partial substitution of ash from sugar cane bagasse in natura

Effect of the chemical attack on the properties of cimentititous composites with partial substitution of ash from sugar cane bagasse in natura

Desempenho mecânico e durabilidade de argamassas contendo adições de resíduos de carvão vegetal amazônico

Biological efficiency and nutritional value of Pleurotus ostreatus cultivated in agroindustrial wastes of palm oil fruits and cocoa almonds

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