Effects of husk particle size and calcium chloride on strength and sorption properties of coconut husk–cement composites

Olorunnisola, Abel O.

doi:10.1016/j.indcrop.2008.09.009

Cited by 53 publications

(35 citation statements)

References 4 publications

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“…According to Olorunnisola (2009), one important variable control for composite properties was spacing between organic material and cement. In the vibro-compaction method, the use of smaller particles tends to create less free space inside the composite and consequently higher MOE values occur than in composites produced with bigger particles.…”

Section: /8mentioning

confidence: 99%

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Particle Sizes and Wood/Cement Ratio Effect on the Production of Vibro-compacted Composites

2018

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The aim of this study was to evaluate the influence of particle size and the wood/cement ratio on the physical and mechanical properties of vibro-compacted wood-cement composites. The effects of three different particle sizes (diameter between 1.4-2.36 mm; 2.36-4 mm; and 4-9.56 mm) and wood:cement ratios of 1:2.75, 1:2 and 1:1.5 on wood-cement composites produced with the Amazonia species Swartzia recurva Poepp. and Portland cement type II-Z were analyzed. All evaluated properties were influenced by the particle size used in the mixture; however, the wood:cement ratio only affected the final density of the composite, internal bond and water absorption properties. Composites produced with particles that pass through a 2.36 mm screen but were retained with a 1.4 mm screen showed average values of modulus of rupture and higher modulus of elasticity than composites produced with bigger particles. The use of a 1:2.75 wood:cement ratio resulted in composites with higher density and dimensional stability than composites produced with a lower amount of cement.

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Section: /8mentioning

confidence: 99%

“…Traditionally, the particle size used in wood-cement composite production can be correlated with the degree of wood and cement particle bonding (Olorunnisola, 2009). Wood-cement composites usually require larger wood particle sizes than are used in particleboard production to ensure economic viability of the final product.…”

Section: Introductionmentioning

confidence: 99%

Particle Sizes and Wood/Cement Ratio Effect on the Production of Vibro-compacted Composites

2018

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“…Conforme OLORUNNISOLA [20], a resistência à flexão em painéis de madeira-cimento está diretamente relacionada ao grau de ligação entre as partículas de madeira e o cimento, dependendo essa ligação das dimensões das partículas utilizadas. Ainda, o estudo de BADEJO [21] indica que a geometria da partícula é altamente correlacionada com propriedades importantes, como o módulo de ruptura à flexão está-tica, o módulo de elasticidade à flexão estática e a ligação interna.…”

Section: Introductionunclassified

Avaliação dos efeitos de diferentes dosagens de água/cal na resistência à compressão axial de compósitos de madeira-cimento

Villas-Bôas¹,

Parchen²,

Iwakiri³

et al. 2017

Matéria (Rio J.)

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RESUMODiversos estudos mostram que algumas espécies de madeira não estão aptas à produção de compósitos madeira-cimento. Isso ocorre porque os componentes orgânicos podem afetar tanto a interação entre a madeira e o cimento, quanto as interações internas do cimento. Com isso, pesquisadores vêm estudando alternativas de pré-tratamento do material de origem vegetal, como por exemplo, utilizando-se aceleradores de pega, aditivos químicos, mineralização da madeira, dentre outros. Uma das técnicas consiste no pré-tratamento da madeira com suspensão de Ca(OH) 2 . O presente estudo teve como objetivo avaliar a influência da quantidade de CaO utilizada na preparação de suspensões de Ca(OH) 2 nas características mecânicas de compósitos de madeira-cimento. Foram avaliados três traços de Ca(OH) 2 , e cinco granulometrias de partículas de Pinus spp oriundas de resíduos de madeireira, por meio da realização de ensaios de compressão axial em corpos de prova cilíndricos. Os resíduos foram secos em estufa, apresentando uma umidade de 3%, sem tratamento. A relação cimento: madeira foi de 1:1,5, em massa. As relações água/cal para produção de Ca(OH) 2 foram 4,7, 6,25 e 7,8. As médias de resistências à compressão axial obtidas mostraram que os compósitos produzidos com a relação água/cal de 6,25 apresentou valores estatísticos mais altos quando comparados aos compósitos produzidos com outras relações de água/cal. Palavras-chave: Madeira-Cimento, Compósitos, Hidróxido de Cálcio. ABSTRACTIn according to a lot of studies, some woods aren't able to compose the cement-wood composite. It is because the affecting of the organics components in the wood-cement interaction and the cement reactions. Then, researchers have studied an alternative to the pre-treatment using Ca(OH)2 suspensions. This study evaluated the influence of the amount of CaO used on Ca(OH)2 suspensions and how they affect the mechanical characteristics of the wood-cement composite. Three Ca(OH)2 mixtures were evaluated and five granulometries of the Pinus spp from lamber residue, through axial compression tests in cilindrical specimens. The waste woods were dried in an oven and presented a 3% moisture. The cement:wood weight ratio was 1:1,5. The water/lime ratios were 4,7/1, 6,25/1 and 7,8/1. The composites produced with water/lime ratio of the 6,25/1 presented the average axial compressive strenght higher compared with others ratios.

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“…The size of the wood particles used on production of wood-cement composites can be direct related to the bound between wood and cement, and as consequence of that, to the final product flexural strength (OLORUNNISOLA, 2009). FRYBORT et al (2008), in their literature review about cement bonded composites, reported previous research that demonstrated the necessity of use larger particles than the ones used in the resin-bonded particleboards.…”

Section: Introductionmentioning

confidence: 99%

Particle size and lime addiction on properties of wood-cement composites produced by the method of densification by vibro compaction

et al. 2017

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This paper aimed to evaluate the effects of particle size and the use of lime as a pretreatment of Pinus spp wood particles on the production of wood-cement composites by vibro-compaction densification. Specimens for internal bond and static bending were produced with two different particle sizes: G1, particles that pass through a 4mm screen and were retained at 2mm screen, and G2, particles that pass through a 2mm screen and were retained at 0.84mm screen. The use of lime was also tested in two different methods as pretreatment of wood particles: carbonatation of wood particles before being used in the composite mixture; and addition of hydrated lime directly to the composite mixture. Use of larger particles (G1) presented higher values of internal bond and MOR than composites produced with smaller particles (G2). About the pretreatments, the use of hydrated lime resulted in composites with higher density and better internal bond.

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Effects of husk particle size and calcium chloride on strength and sorption properties of coconut husk–cement composites

Cited by 53 publications

References 4 publications

Particle Sizes and Wood/Cement Ratio Effect on the Production of Vibro-compacted Composites

Particle Sizes and Wood/Cement Ratio Effect on the Production of Vibro-compacted Composites

Avaliação dos efeitos de diferentes dosagens de água/cal na resistência à compressão axial de compósitos de madeira-cimento

Particle size and lime addiction on properties of wood-cement composites produced by the method of densification by vibro compaction

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