Asbestos Cement
Mostrando 1-12 de 57 artigos, teses e dissertações.
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1. WATER RELATIONS AT THE INITIAL SUGARCANE GROWTH PHASE UNDER VARIABLE WATER DEFICIT
ABSTRACT This study aimed to quantify water deficit levels that compromise sugarcane initial growth exposed to different availability soil depths. The experiment was conducted in a greenhouse by using 100-liter capacity asbestos-cement boxes filled with different soil layers simulating depths of 10, 20, 30, and 40 cm. Water deficit levels were represented by
Eng. Agríc.. Publicado em: 2017-04
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2. Study of hygral behavior of non-asbestos fiber cement made by similar hatschek process
Fiber cement, similarly to all cementitious materials, undergoes dimensional and volumetric changes when it is exposed to dry and wet environments. When exposed to natural weathering, cement-based materials absorbs and may also release water to their surroundings via a very complex inherent pore structure. In this work initialized a few years ago, some prope
Mat. Res.. Publicado em: 05/11/2013
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3. Tratamento de esgoto sanitário pelo sistema zona de raízes utilizando plantas de bambu / Sewage treatment by root zone system using bamboo plants.
This study aimed to evaluate the efficiency of three species of bamboo (Guadua angustifolia, Phyllostachys aurea and Phyllostachys bambusoides) in the sanitary sewage treatment, with a vertically downward sub-surface flow root zone system, in Goiânia, GO, Brazil. Sewage from a university was applied to asbestos cement water tanks with 1,000 liters volume ca
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/08/2011
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4. Tratamento de esgoto sanitário pelo sistema zona de raízes utilizando plantas de bambu / Sewage treatment by root zone system using bamboo plants.
This study aimed to evaluate the efficiency of three species of bamboo (Guadua angustifolia, Phyllostachys aurea and Phyllostachys bambusoides) in the sanitary sewage treatment, with a vertically downward sub-surface flow root zone system, in Goiânia, GO, Brazil. Sewage from a university was applied to asbestos cement water tanks with 1,000 liters volume ca
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/08/2011
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5. Improving the process Hatschek, by means of treatment of historical data for manufacture of tiles wavy. / Melhoria do processo Hatschek, por meio de tratamento de dados históricos, para fabricação de telhas onduladas.
As telhas de cimento-amianto são utilizadas mundialmente nas construções comerciais, residenciais e industriais. O amianto foi a primeira aplicação de fibra natural em escala industrial. Esta fibra foi incorporada na forma do mineral (asbesto) como reforço de matrizes à base do cimento. O processo de fabricação de telhas de cimento-amianto mais util
Publicado em: 2010
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6. Biosolids as water fertilizer for plankton production / Biossólidos como fertilizantes de água para produção de plâncton
Aiming to evaluate the use of biosolid as a water fertilization strategy in the production of Daphnia sp., were conducted three experiments in the Fish Nutrition Laboratory of the Department of Animal Science of the Federal University of Viçosa (UFV). The first experiment, conducted during February and March 2008, to last for thirteen days, aimed to evaluat
Publicado em: 2008
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7. Utilização de pozolanas em compósitos de cimento reforçados com fibras de celulose e PVA. / Pozzolan utilization in cement composites reinforced with celullose and PVA fibers.
Composites reinforced with natural fibers are a good asbestos fibercomposites replacement material, as a result of the great natural fiber avaibility such as coco nut, sisal and cellulose. Durability aspects need to be improved, like the decrease of fiber resistance in alkaline environment causing the loss of mechanical properties of the composites. An alter
Publicado em: 2006
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8. RETRAÇÃO, FLUÊNCIA E FRATURA EM COMPÓSITOS CIMENTÍCIOS REFORÇADOS COM POLPA DE BAMBU / SHRINKAGE, CREEP AND FRACTURE OF CEMENTITIOUS COMPOSITES REINFORCED WITH BAMBOO PULP
The application of cimentitious composites using vegetal fibers in substitution of asbestos is a worldwide fact in the fiber cement industry. Despite their good mechanical properties and durability, the use of asbestos fibers causes well-known health hazards. Although vegetal fibers have relatively poor mechanical properties compared with synthetic fibers, t
Publicado em: 2006
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9. Aspectos produtivos e análise do desempenho do fibrocimento sem amianto no desenvolvimento de tecnologia para telhas onduladas / Productive aspects and performance of fibrecement without asbestos in the development of technology for undulate roofing tiles
Estudos anteriores utilizando matriz cimentícia reforçada exclusivamente com fibras vegetais propiciaram a produção de telhas com desempenho aceitável nas idades iniciais. Porém, com o envelhecimento natural, as telhas apresentaram significativa redução do desempenho mecânico, fato este atribuído principalmente ao ataque alcalino da matriz cimentí
Publicado em: 2006
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10. Durabilidade de argamassas modificadas por polimeros e reforçadas com fibras vegetais / Durability of fiber-cement polimer modify
Several researches on vegetal-fiber-cement composites have been developed aiming to solve problems related to the banishment of asbestos and environmental damages due to deposition or burnirng of agro-industry residues. The durability of the cellulose-cement composites is a key factor to introduce such material in the market. Several researches have been dev
Publicado em: 2004
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11. Composição de acidos graxos e quantificação dos acidos graxos LNA, EPA e DHA no tecido muscular de tilapias (Oreochromis niloticus), submetidas a diferentes tratamentos com oleo de linhaça. / Fatty acid compositionand and quantification one of LNA, EPA and DHA in the fabric muscular of tilapias (Oreochoromis niloticus), submitted the different treatments with linseed oil.
The present work had as its aim to raise the omega-3 (@-3 or n-3) fatty acids content in farm fish. With this in mind young Tilapias (Oreochromis niloticus) samples weighing approximately 88g were taken randomly to captivity in an experiment with four treatments (B, C, D and E) using linseed oil and one control (treatment A) using sunflower oil. The rations
Publicado em: 2003
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12. Fibre type and concentration in the lungs of workers in an asbestos cement factory.
The predominant asbestos fibre type used in the production of asbestos cement is chrysotile. The use of asbestos in relation to fibre type in a Norwegian asbestos cement plant during 1942-80 was 91.7% chrysotile, 3.1% amosite, 4.1% crocidolite, and 1.1% anthophyllite respectively. Electron microscopy and x ray microanalysis of lung tissue samples of asbestos