Thermal performance of sisal fiber-cement roofing tiles for rural constructions

Tonoli, Gustavo Henrique Denzin; Santos, S.F.; Rabi, José Antonio; Santos, Wilson Nunes dos; Savastano, Holmer

doi:10.1590/s0103-90162011000100001

Cited by 16 publications

(12 citation statements)

References 11 publications

(10 reference statements)

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“…Natural fibers are biodegradable, renewable and widely available in Brazil. Their use as reinforcement of cement-based matrices has added advantages such as high toughness, post-cracking performance, resistance to impact (MELO FILHO, 2005) and thermal insulation (PADILHA et al, 2001;TONOLI et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Characterization and treatment of sisal fiber residues for cement-based composite application

Lima¹,

Santos²,

Ferreira³

et al. 2014

Eng. Agríc.

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ABSTRACT:Sisal fiber is an important agricultural product used in the manufacture of ropes, rugs and also as a reinforcement of polymeric or cement-based composites. However, during the fiber production process a large amount of residues is generated which currently have a low potential for commercial use. The aim of this study is to characterize the agricultural residues by the production and improvement of sisal fiber, called field bush and refugo and verify the potentiality of their use in the reinforcement of cement-based composites. The residues were treated with wet-dry cycles and evaluated using tensile testing of fibers, scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. Compatibility with the cement-based matrix was evaluated through the fiber pull-out test and flexural test in composites reinforced with 2 % of sisal residues. The results indicate that the use of treated residue allows the production of composites with good mechanical properties that are superior to the traditional composites reinforced with natural sisal fibers.

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Section: Introductionmentioning

confidence: 99%

Characterization and treatment of sisal fiber residues for cement-based composite application

Lima¹,

Santos²,

Ferreira³

et al. 2014

Eng. Agríc.

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“…Solar radiation that reaches the roof is reflected, absorbed or transmitted in quantities that vary according to material physical properties (MICHELS et al, 2008;TONOLI et al, 2011). Therefore, there were no convection or irradiation losses of the energy falling on tiles, so that being absorbed and heating them and, consequently, being transmitted to the attic (region between the tile and the lining).…”

Section: Introductionmentioning

confidence: 99%

“…These authors concluded that blue raffia presented the best zootechnical performance, being the worst performance observed in white raffia. In this sense, the use of materials that exhibit a low absorption coefficient, low thermal conductivity and diffusivity, and higher thermal inertia is essential to reduce heat transfer inside a building (TONOLI et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Thermal Efficiency of Different Coverage Materials in Reduced Models of Animal Husbandry Facilities: A Case Study

Castro¹,

Silva²,

Nazareno³

et al. 2017

Eng. Agríc.

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This study aimed to assess different combinations of coverage materials in reduced models of animal husbandry facilities based on thermal comfort indices. It was conducted in an experimental area of the Research Center in Ambience located in São Paulo State, Brazil (22°42′30″ S and 47°38′00″ W). The performance of ceramic and fiber-cement (white painted) tiles was assessed associated with two types of polypropylene commercial linings (lining A and B) installed below the roof, and a thermo-reflective screen (lining C) installed above the fiber-cement roof. Microclimatic assessment of distorted reduced-scale models was performed at 15-minute intervals by registering the air temperature, black globe temperature, relative humidity and air velocity. Subsequently, black globe humidity index, specific enthalpy, and radiant heat load were calculated. The experimental design was randomized block design with 5 treatments and 15 blocks (replications), totaling 75 experimental units. The reduced-scale models with lining B presented a reduction for all thermal comfort indices. Lining C, installed on the coverage, showed no upgrading of environmental thermal conditions. Thus, lining B presented a better thermal performance regardless the tile type.

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“…Pesquisadores e fabricantes têm buscado a utilização de fibras alternativas ao amianto (Tonoli et al, 2011). O uso de fibras vegetais pode mostrar-se como opção viável por se tratar de um material renovável e de baixo custo, quando comparadas às fibras sintéticas.…”

Section: Introductionunclassified

Cinza de palha de cana-de-açúcar como adição mineral em fibrocimento

Rodrigues

Beraldo

Júnior

et al. 2013

Rev. bras. eng. agríc. ambient.

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RESUMOO Brasil é o maior produtor mundial de cana-de-açúcar e sua indústria sucroalcooleira gera grande quantidade de resíduos líquidos e sólidos, dentre eles a palha da cana-de-açúcar. Com o objetivo de agregar valor a este resíduo produziu-se, neste trabalho, cinza de palha de cana-de-açúcar por meio da queima controlada a 700 °C e se avaliou sua aplicação como adição mineral em compósitos de fibrocimento. A cinza foi caracterizada pelas técnicas de fluorescência de raios X, difração de raios X, granulometria a laser e superfície específica. Nos compósitos foram avaliadas as propriedades de absorção de água, porosidade aparente, massa específica aparente, módulo de ruptura, energia específica, módulo de elasticidade e limite de proporcionalidade. A caracterização das cinzas indicou superfície específica e porosidade elevadas, além de apresentar um halo de amorficidade no seu difratograma. Compósitos produzidos com as cinzas mostraram características físicas e mecânicas similares àquelas do controle o que viabiliza a substituição parcial do cimento Portland por esse tipo de cinzas. Palavras-chave: pozolana, resíduos agroindustriais, porosidadeSugarcane straw ash as mineral addition in fiber-cement ABSTRACT Brazil is the world's largest producer of sugarcane, and its sugarcane industry generates a large amount of liquid and solid wastes, among them the sugarcane straw. Aiming to add value to this waste, sugarcane straw ash was produced by controlled burning at 700 °C and it was applied as mineral addition in cement composites. The ashes were characterized by the techniques of X ray fluorescence, X ray diffraction, laser particle size and specific surface area. The following composite properties were evaluated: water absorption, apparent porosity, bulk density, modulus of rupture, specific energy, elastic modulus and proportionality limit. The characterization of ash showed a high specific surface area and porosity and a halo of amorphicity was observed in the diffractograms. Composites produced with these ashes showed physical and mechanical characteristics similar to that of the control, allowing the partial replacement of Portland cement by this type of ashes.

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Thermal performance of sisal fiber-cement roofing tiles for rural constructions

Cited by 16 publications

References 11 publications

Characterization and treatment of sisal fiber residues for cement-based composite application

Characterization and treatment of sisal fiber residues for cement-based composite application

Thermal Efficiency of Different Coverage Materials in Reduced Models of Animal Husbandry Facilities: A Case Study

Cinza de palha de cana-de-açúcar como adição mineral em fibrocimento

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