Developments on vegetable fibre–cement based materials in São Paulo, Brazil: an overview

Agopyan, Vahan; Savastano, Holmer; John, Vanderley M.; Cincotto, Maria Alba

doi:10.1016/j.cemconcomp.2004.09.004

Cited by 292 publications

(163 citation statements)

References 13 publications

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“…According to Wang and Huang (2009), about 55 billion coconuts are harvested annually in the world, but only 15% of the husk fibers are currently recovered for consumption. Hence, research and development efforts have been undertaken to find new use for coir, e.g., as a reinforcement in polymer composites (Monteiro et al 2008;Satyanarayana et al 2009;Asasutjarit et al 2009;Ali 2010;Yao et al 2012), cement composites, and particle board for building construction (Khedari et al 2004;Agopyan et al 2005;Asasutjarit et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Linerboard Made from Soda-Anthraquinone (Soda-AQ) Treated Coconut Coir Fiber and Effect of Pulp Beating

Main¹,

Talib²,

Ibrahim³

et al. 2015

BioResources

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The performance of coir fiber in the production of linerboard made from soda-anthraquinone (soda-AQ) pulp was evaluated. Based on chemical analysis, the composition of coir fiber is suitable for the pulping process. Out of nine pulping conditions characterized, a pulping condition of 18% active alkali for 90 min cooking time was chosen. These conditions provided the highest screened yield (48.99%), a low rejection yield (0.27%), high viscosity (11.73 cP), and a kappa number (41) that is acceptable for unbleached linerboard production. Beating strengthened the coir pulp. Analyzing the beating revealed that coir pulp was optimized at 1000 to 2000 revolutions, based on a graph of freeness vs. burst index. For all beating conditions (1000 to 8000 revolutions), FESEM micrographs showed the presence of internal and external fibrillation of the fiber, which gradually increased fiber conformability and improved the inter-fiber bonding within the paper formation. Based on its burst strength of 4.57 kPa.m 2 /g and ring crush test of 1.76 Nm 2 /g, which complies with the minimum requirement of the industry standard, coir fiber can be considered an alternative fiber source for linerboard production.

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Section: Introductionmentioning

confidence: 99%

Linerboard Made from Soda-Anthraquinone (Soda-AQ) Treated Coconut Coir Fiber and Effect of Pulp Beating

Main¹,

Talib²,

Ibrahim³

et al. 2015

BioResources

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“…Many studies describing the use of cellulose-based fibers as a reinforcement for cement-based composites have been published [10][11][12][13][14][15][16][17]. Nonetheless, in most of these papers the fibers are used in pulp or staple forms, limiting the improvement of the flexural strength and ductility of the composites, owing to the short length of the fibers, and the maximum quantity that it is possible to mix with the cement matrix (around 4-6 wt.%).…”

Section: Introductionmentioning

confidence: 99%

Natural fiber nonwoven reinforced cement composites as sustainable materials for building envelopes

Claramunt

Fernández-Carrasco

Ventura

et al. 2016

Construction and Building Materials

109

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This experimental research analyzes the mechanical performance and durability of façade pieces based on Portland cement matrix and flax nonwovens as reinforcement. Two types of pozzolanic additions (silica fume and metakaolin) combined with nonwovens subjected to different treatments to decrease their water absorption are analyzed as potential materials for fiber-cement sheets for building envelopes with high strength and durability. For this purpose, on the one hand, the mechanical performance and chemical composition of various ternary compositions were studied. On the other hand, various treatments were performed on the nonwovens and the nonwoven-matrix adherence was also analyzed. Finally, composites were prepared from some selected treated nonwovens and matrix mixtures, and their mechanical properties and durability were evaluated under four-point bending tests after 28 days of curing in a humidity chamber and after accelerated aging. The composites developed with the treated nonwovens presented very high performance combined with enough durability to be potential candidates for the development of sustainable materials for building envelopes. Highlights-Mechanical performance and durability of OPC/flax nonwovens composites for façade pieces is explored -The effect of two pozzolanic additions combined with nonwoven treatment is evaluated -Significant improvements in the durability using treated nonwovens 3

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“…The application of very low-value agricultural waste as granular additive in civil construction and engineering materials is a worldwide trend, not only in function of economical interests but also due to growing concern about environmental aspects. The use of locally available raw materials such as sisal, banana, coconut and eucalyptus in fiber-reinforced composites and in lightweight concretes, for example, has been the subject of continuous evaluation (savastano et al, 2000;Agopyan et al, 2005;Coutts, 2005).…”

Section: Resultsmentioning

confidence: 99%

An evaluation of fibrous structure and physical characteristics of Cutia nut (Couepia edulis Prance) shell

Assis¹,

Pessoa

2009

Acta Amaz.

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The Cutia-nut (Couepia edulis Prance), a species originally from the Amazon region, has a kernel with reasonable nutritional value and a hard and thick woody shell that constitute most of the fruit. After the kernel removal, the shells are regarded as waste. The possibility of using such shells, as raw material for burning or charcoal production, as well as milled residue for structural reinforcement materials is quite feasible, considering environmental and economical aspects. There is, however, a complete lack of characterization of the Cutia-nut shell and other similar species which can aggregate desirable qualities for application as engineering material. in this study some analyses are presented aiming at providing information for potential uses of these residues. in general, the shells follow a regular shape with certain dimensional proportionality to the kernel. The shell is a fibrous material with high lignin content, present low water absorption and high resistance to natural degradation.KEYWOrDs: Cutia-nut, shell characterization, fibrous structure, natural waste utilization Uma avaliação da estrutura fibrosa e das características físicas da casca da Castanha de cutia (Couepia edulis Prance) rEsumO A castanha-de-cutia (Couepia edulis Prance), uma espécie típica da região amazônica, é possuidora de uma amêndoa de razoável valor nutricional e caracterizada por ter uma casca espessa e altamente resistente, que constitui a maior parte do fruto. esta casca, após a retirada da amêndoa, é totalmente descartada. A possibilidade do aproveitamento das cascas, seja como matéria prima para a queima ou simples confecção de carvão, ou como elemento para uso como aditivo de reforço em materiais estruturais é plenamente viável, não somente do ponto de vista ambiental mas também econômico. Há, contudo, uma ausência total de caracterizações da casca da castanha-de-Cutia e de demais espécies tropicais similares que potencialmente podem agregar qualidades desejadas para aplicações como materiais de engenharia. Neste trabalho são apresentadas algumas análises realizadas que podem vir a subsidiar o potencial emprego desses resíduos. De um modo geral, as cascas apresentam formatos regulares com certa proporcionalidade dimensional com a amêndoa. são fibrosas e com alto teor de lignina o que garante baixa absorção de água e alta resistência à degradação natural.PALAVrAs-cHAVE: Castanha de Cutia, caracterização da casca, estrutura fibrosa, usos de resíduos naturais

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Developments on vegetable fibre–cement based materials in São Paulo, Brazil: an overview

Cited by 292 publications

References 13 publications

Linerboard Made from Soda-Anthraquinone (Soda-AQ) Treated Coconut Coir Fiber and Effect of Pulp Beating

Linerboard Made from Soda-Anthraquinone (Soda-AQ) Treated Coconut Coir Fiber and Effect of Pulp Beating

Natural fiber nonwoven reinforced cement composites as sustainable materials for building envelopes

An evaluation of fibrous structure and physical characteristics of Cutia nut (Couepia edulis Prance) shell

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