Compósitos à base de cimento reforçados com polpa celulósica de bambu. Parte I: Determinação do teor de reforço ótimo

Anjos, Marcos Alyssandro Soares dos; Ghavami, Khosrow; Barbosa, Normando Perazzo

doi:10.1590/s1415-43662003000200026

Cited by 9 publications

(7 citation statements)

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“…Possibly, for lower quantities, there is a reduction in the modulus of rupture by the insufficient amount of fibers and, for higher quantities, due to the loss dispersion caused by a large amount of fiber. This same trend was observed in studies conducted by [31]. According to Figs.…”

Section: Modulus Of Rupturesupporting

confidence: 88%

Optimization of the Percentage of Cellulose, Latex and Metakaolin in the Production of Cementitious Composites

Santos¹,

Ferreira²,

Motta³

et al. 2019

IJAERS

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In this work the influence of the addition of the variables cellulose kraft pulps, natural rubber latex and metakaolin as reinforcements in cementitious composites was studied.The influence of the analyzed variables on the properties of the cementitious composites was evaluated through an experimental design (DOE) at 28 days age. The best modulus of rupture was the 12.29 MPa presented by the composite with 7.097% cellulose, 0.37% latex and 50.155% metakaolin. The composite with 5.928% cellulose, 1.85% latex, and 55.195% metakaolin had the best toughness of approximately 1.10 kJ/m². According to the results obtained contact angle, it was possible to prove that the latex adhered to the pulp, hydrophobizing it. Therefore, it was concluded that it is possible to use the natural rubber latex in the cellulosic pulp and the metakaolin to protect the fiber in cementitious composites.

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Section: Modulus Of Rupturesupporting

confidence: 88%

Optimization of the Percentage of Cellulose, Latex and Metakaolin in the Production of Cementitious Composites

Santos¹,

Ferreira²,

Motta³

et al. 2019

IJAERS

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“…This observation indicates improved adherence of the fibers with the matrix for the F22AN composite, which is consistent with both the MOR (Table 5) and the difference of the mechanisms for failure described above. The results obtained in this work were improved compared to those reported by Dos Anjos et al 83 To verify either the presence of Ca originating from the cementitious matrix or the permanence or loss of the coating in the case of the composites made with F22AN fibers, a portion of the fibers at the point of failure of the failed test specimens was removed and examined. The variations of some elements in the F22AN fiber before and after contact with the cement matrix are described in Table 4.…”

Section: ■ Introductionmentioning

confidence: 52%

“…The fracture for composites made with F12 fibers is most likely caused by the failure of the interface between the fiber and the matrix (loss of adhesion). Mohr et al 57 reports that the loss of adhesion can be favored by a weak interfacial zone, which can impart less friction during ductile fiber pull out, 57 because this mechanism dissipates more energy than the mechanism due to breakage of the fiber, as reported by Dos Anjos et al 83 This behavior is also indicated by the high values of the energy ductility index and the pull out zones observed in the SEM micrographs (Figure 8g). The failure pattern for the F22AN composite (Figure 8b) is a centered trough, with the sample generating less cracks than the composite with F12 fibers.…”

Section: ■ Introductionmentioning

confidence: 64%

“…The improvement achieved in the ductility was found to be related to the length of the fiber. Some studies reported that the deformations and the mechanical behavior is influenced by the fiber length ,, in most cases. When the flexural strength is compared between the composite G0 and the composites made with F12 and F22AN fibers at 2% of addition (Table ), there is an increase between 3.82 and 13.58% for the reinforced composites made with F22AN but there is a decrease for composites with the F12 fiber.…”

Section: Resultsmentioning

confidence: 99%

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Cementicious Materials Reinforcement UsingAngustifolia kunthBamboo Fiber Covered with Nanostructured Manganese Oxide

Tolosa

Jimenez-Obando

Arias

et al. 2014

Ind. Eng. Chem. Res.

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In this work, to improve the interface interaction between natural fibers and a cementitious matrix, several Colombian Angustifolia kunth bamboo fibers were modified using different pretreatment methods before being covered with an inorganic phase of manganese oxide. The coating was performed by placing the fiber in contact with a manganese salt solution at low concentration, followed by drying of the fibers before performing physicochemical characterization. The fibers were characterized by atomic absorption, X-ray diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). The coated fibers were added to a cementitious matrix, and the mechanical properties of the resulting composites were measured to determine the optimal treatment for reinforcing the cementitious matrix. The manganese content in the modified natural fibers obtained by atomic absorption was between 0.7 and 1.23 wt %, and the manganese oxide was deposited in a uniform manner onto the surface of the fiber, as indicated by the SEM images. The XRD patterns indicate some variation of the crystalline structure of cellulose, the TGA analysis indicates that the raw fiber lost more weight than did the covered fibers, and the FTIR revealed the vibrational bands associated with manganese oxide vibration. The mechanical properties measured by monitoring the flexural strength indicate the interplay between the physicochemical characterizations and the mechanical performance. Various samples of the composite material were prepared by varying the length, and the percentage of the addition of the fiber, and the flexural strength, toughness, energy index, and total energy of the samples were measured in all fibrocement materials; the measurement results indicate an improvement in the flexural strength of the materials occurred for the composite material synthesized with the addition of 2% fibers of 2.5 cm length.

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“…Neste sentido, um dos grandes problemas com que se deparam as populações dos países em desenvolvimento é a falta de habitações dignas em virtude, principalmente, dos elevados preços dos materiais de construção (Lima Júnior et al, 2003); surge, então a necessidade de se utilizar materiais alternativos que sejam ecológicos, de baixo custo e com disponibilidade local (Anjos et al, 2003b), de modo a baratear os custos das habitações.…”

Section: Introductionunclassified

Atividade pozolânica dos resíduos do beneficiamento do caulim para uso em argamassas para alvenaria

Menezes

Neves

Souza

et al. 2009

Rev. bras. eng. agríc. ambient.

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A indústria do beneficiamento do caulim gera enorme quantidade de resíduos, descartados indiscriminadamente no meio ambiente; assim, este trabalho tem por objetivo analisar a viabilidade técnica e a atividade pozolânica dos resíduos do beneficiamento do caulim para a produção de argamassas. Os resíduos foram caracterizados através da determinação de sua distribuição granulométrica e composição química, difração de raios X e análise térmica diferencial e gravimétrica; em seguida, determinou-se o índice de atividade pozolânica dos resíduos de caulim com a cal e o cimento Portland. Argamassas de cimento:cal:areia foram preparadas e o resíduo, na condição natural e após queima a 600 °C por 2 h, substituiu parcialmente o cimento nas proporções de 5, 10, 15 e 20% em massa. Corpos-de-prova foram moldados e determinada sua resistência a compressão simples. Conclui-se, com base nos resultados, que os resíduos são constituídos de caulinita, mica e quartzo e que a utilização do resíduo calcinado aumenta a resistência das argamassas após 28 dias de cura em até 150%.

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Compósitos à base de cimento reforçados com polpa celulósica de bambu. Parte I: Determinação do teor de reforço ótimo

Cited by 9 publications

References 0 publications

Optimization of the Percentage of Cellulose, Latex and Metakaolin in the Production of Cementitious Composites

Optimization of the Percentage of Cellulose, Latex and Metakaolin in the Production of Cementitious Composites

Cementicious Materials Reinforcement UsingAngustifolia kunthBamboo Fiber Covered with Nanostructured Manganese Oxide

Atividade pozolânica dos resíduos do beneficiamento do caulim para uso em argamassas para alvenaria

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