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[en] ANALYSIS OF THE CEMENT-TREATED AGGREGATE BASE MATERIAL BEHAVIOR WITH A TIRE RUBBER ADDITION FOR PAVEMENTS BASE APPLICATIONS / [pt] ANÁLISE DO COMPORTAMENTO DE BRITA GRADUADA TRATADA COM CIMENTO COM A ADIÇÃO DE BORRACHA DE PNEUS PARA APLICAÇÃO EM CAMADAS DE BASE DE PAVIMENTOSCIRO LOYOLA TESSARI 25 April 2018 (has links)
[pt] Este trabalho apresenta um estudo técnico experimental sobre a utilização de borracha moída de pneu (BMP) como adição, juntamente com cimento Portland à brita graduada simples (BGS), no intuito de avaliar a aplicabilidade desse material em camadas de base de pavimentos rodoviários. Como resultado obtémse uma BGTC - Brita graduada tratada com cimento, com adição de BMP. O principal objetivo da adição de borracha na BGTC é reduzir o fissuramento, que é um problema comum em bases cimentadas. Para melhor comparação dos resultados das misturas com adições de borracha foi realizada uma mistura de BGTC sem adições, a qual foi tratada como mistura padrão neste estudo, com 3 por cento, 4 por cento e 5 por cento de cimento. O agregado granítico selecionado para esta pesquisa é proveniente de jazida situada no município de Cariacica/ES e foi escolhido por ter apresentado bom desempenho nos ensaios de caracterização. A partir da análise granulométrica realizada na borracha, selecionou-se para esse estudo a fração passante na peneira de 2,38mm e retida na peneira de 1,19 mm. Foram estuadas as seguintes
porcentagens de adição de BMP: 0,5 por cento, 1,0 por cento, 1,5 por cento, 2,5 por cento, 3,5 por cento e 4,5 por cento. As amostras foram submetidas a ensaios de compactação, compressão simples, compressão
diametral, triaxial de cargas repetidas e microscopia eletrônica de varredura. Os ensaios de compressão simples foram realizados com tempos de cura de 7, 28 e 56 dias. Os ensaios de compressão diametral foram realizados com tempos de cura de 28 e 56 dias. Os ensaios triaxiais de carga repetida foram realizados com tempo de cura de 56 dias. Os resultados obtidos foram satisfatórios, sendo dependentes do teor de BMP utilizados e do tempo de cura. Dentre as composições de BMP estudadas, a que apresentou o melhor comportamento foi a que possuia adição de 1,5 por cento de borracha e 56 dias de cura. Esta adição apesar de reduzir a RCS e a RTCD em 30 por cento e 28 por cento respectivamente, proporcionou melhoria no comportamento resiliente e menor perda de resistência na região pós pico perante o ensaio de RCS. Tal fato ressalta o emprego positivo de borracha de pneu triturada em camadas de base de pavimentos rodoviários, tanto sob a ótica da engenharia de pavimentos quanto em relação a questões ambientais e econômicas. / [en] This work presents a technical and experimental study on the use of tire rubber as an addition, together with Portland cement, to a simple graded gravel, in order to evaluate the applicability of this material in the base layers of road pavements. As a result, cement-treated graded gravel with the addition of rubber is obtained. The main objective of the addition of rubber is to reduce cracking, which is a common problem in cemented bases. A standard mixture of cement-treated graded gravel was carried out for better comparison between the mixtures with additions of 3 percent, 4 percent and 5 percent of cement. The granitic aggregate selected for this research came from the municipality of Cariacica/ES and was selected because it presented an appropriate performance in the characterization tests. From the granulometric analysis performed on this material, the fraction passing the sieve 2,38 mm and retained in the sieve 1,19 mm, was selected for this study. In this study were selected 0,5 percent, 1,0 percent, 1,5 percent, 2,5 percent, 3,5 percent and 4,5 percent additions of rubber. The blends were subjected to compaction, direct compression, split tensile, cyclic triaxial and scanning electron microscope tests. Direct compression tests were performed with cure times of 7, 28 and 56 days. Split tensile tests were performed with curing time of 28 and 56 days. Cyclic triaxial tests were performed with curing time os 56 days. The results were satisfactory, being dependent on the content of rubber and the curing time. Among the blends that were analyzed, 1,5 percent of addition and 56 days of curing time leaded to the best results. Despite the reduction of 30 percent and 28 percent in the compression and tensile resistances, this amount of rubber
addition provided a better resilient behavior and a higher post pick resistance in the compression test. This fact highlights the positive use of tire rubber in pavement base layers, not only from the standpoint of pavement engineering, but promoting gains of sustainability and economy as well.
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Utilização de resíduos da indústria de calçados em blocos de vedação com novas geometrias - Bloco Evang / Recycling of residues from the footwear´s industry for alternative masonry blocks with a new geometry - Evang BlockPimentel, Ubiratan Henrique Oliveira 30 September 2005 (has links)
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Previous issue date: 2005-09-30 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / The generation of residues by the footwear s industry, especially E.V.A. residues
(Ethilene Vinil Acetate), is calling specialist s attention for the elaboration of researches that
make possible to recycle these residues for the Civil Construction Industry. It is known that
such residues have as characteristics: low specific mass, good acoustic and thermal behavior,
stability, inert, not susceptible to fungi, besides having good potential to be used as a of
synthetic attaché for elaboration of light composites, being a substitute for part of the natural
aggregates. This work presents results of a research about the use of these residues as a light
aggregate for the fabrication of masonry blocks designated to the Civil Construction, using an
alternative material and a new geometry (EVANG Block). The objective was to develop a
new masonry block with increased dimensions, if compared to the traditional sizes, to be used
as an alternative masonry reusing industrial residues, preserving the environment, considering
its characteristics and the manual process of manufacture with a steel mold specified at the
experiments. The results show that the block, with dimensions of 59,0 cm x 26,5 cm x 11,5
cm (determined by a modulated pattern of construction), is highly flexible with an average
strength of 0,82 MPa, using 80% of residues on its composition to replace the natural
aggregates. Therefore, it may be told that there are important contributions in this research,
showing its technical viability: the possibility to recycle an industrial residue, the reduction of
the need of natural aggregates and the increase of productivity for the masonry walls at the
buildings / A geração de resíduos de E.V.A. (Etileno Acetato de Vinila) pela indústria calçadista tem se
constituído num problema para o setor e, ao mesmo tempo, tem despertado a atenção de
pesquisadores para a reciclagem desses resíduos pela construção civil. Sabe-se que tais
resíduos têm baixa massa específica e características termo-acústicas favoráveis, não são
susceptíveis a fungos e têm grande potencial, para serem empregados como agregados
artificiais sintéticos, em substituição aos naturais, na elaboração de compósitos cimentícios.
Neste trabalho, apresentam-se os resultados de uma ampla investigação sobre a utilização
desse resíduo como agregado leve na confecção de vedações na construção civil, utilizando
um bloco não convencional com nova geometria (bloco EVANG). O objetivo foi projetar um
novo bloco de vedação com novas geometrias, diferentes dos convencionais para se utilizar
como elemento de vedação alternativo aproveitando os resíduos industriais, preservando o
meio ambiente, considerando as peculiaridades do compósito utilizado e o processo manual
de confecção dos mesmos em forma metálica, estabelecido nos experimentos. Os resultados
demonstraram que o bloco projetado, que resultou nas dimensões: 59,0 cm x 26,5 cm x 11,5
cm (conforme estudo de modulação), possui uma boa característica de ductilidade com
resistênc ia média de 0,82 MPa, utilizando 80% de resíduo de E.V.A. em substituição aos
agregados naturais. Portanto pode-se dizer que há contribuições importantes neste estudo,
viabilizando tecnicamente a reciclagem de um resíduo, a redução do consumo de agregados
naturais e o aumento na produtividade na execução de alvenarias nas construções
Alvenarias; Blocos; E.V.A.; Materiais não convencionais;
Reciclagem; Resíduos Industriais.
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Utilização de resíduo de vidro moído como adição mineral para a produção de concreto autoadensável e de alto desempenhoSousa Neto, Luciano Moreira de 21 March 2014 (has links)
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Previous issue date: 2014-03-21 / Não Informada / High performance concrete, in addition to high strength, has lower permeability and
higher durability. The self-compacting concrete reduces the need for densification and
scattering and facilitates concreting of slender pieces. The combination of these two
concrete on one allows the linking of the qualities of both. In the construction industry,
concrete production has potential to reuse some kinds of residues. In this work, the residue of industrial glass was used as mineral additive in the combined production of high
performance concrete and self-compacting concrete. The residue of industrial glass, after
the grinding process, was added to the concrete with the aim to evaluate its properties in
fresh and hardened state. It was possible to evaluate and compare the performance of
industrial waste glass with silica fume. Following the experimental program, the materials
were characterized and Marsh Funnel tests and minicone of Kantro were performed with
the superplasticizer MC-PowerFlow 1102. The optimum dosage of superplasticizer was
evaluated in fresh concrete tests. Concrete were produced and characterized in fresh and
hardened states. For characterization of concrete in the fresh state, the following tests were used: slump flow, T500, L box, funnel method V and segregation column method. For characterization of concrete in the hardened state, the following tests were performed:
axial compression tests, traction by diametrical compression, static modulus of elasticity
and water absorption by immersion. Concrete with the addition of waste ground glass hit
resistance close to 67 MPa at 90 days, while the concrete with addition of silica fume hit
resistance close to 88 MPa at the same age. As the concrete produced with addition of
industrial waste glass obtained swift technical skills of high performance concrete and selfcompacting concrete, the results of this research were considered satisfactory. / O concreto de alto desempenho, além de alta resistência, tem baixa permeabilidade e maior durabilidade. O concreto autoadensável reduz a necessidade de adensamento e espalhamento e facilita a concretagem de peças esbeltas. A combinação desses dois concretos em um só permite a junção das qualidades de ambos. Na indústria da construção civil, a produção de concreto é um celeiro potencial para reutilizar alguns tipos de resíduos. Neste trabalho, o resíduo de vidro industrial foi usado como aditivo mineral na produção combinada de concreto de alto desempenho e autoadensável. O resíduo de vidro industrial, após o processo de moagem, foi adicionado ao concreto, com o objetivo de avaliar as suas propriedades no estado fresco e endurecido. Foi possível avaliar e comparar o desempenho do resíduo de vidro industrial com a sílica ativa. Seguindo o programa experimental, os materiais foram caracterizados e ensaios de funil de Marsh e minicone de Kantro foram realizados com o superplastificante MC-PowerFlow 1102. A dosagem ótima do superplastificante foi avaliada em ensaios de concreto fresco. Os concretos foram produzidos e caracterizados nos estados fresco e endurecido. Para a caracterização do concreto no estado fresco, foram realizados os seguintes ensaios: slump flow, T500, caixa L, método de funil V e método da coluna de segregação. Para a caracterização do concreto no estado endurecido, foram realizados os seguintes ensaios: ensaio de compressão axial, tração por compressão diametral, determinação do módulo de compressão estático de elasticidade e determinação de absorção de água por imersão. O concreto com a adição de resíduo de vidro moído atingiu resistência próxima de 67 MPa aos 90 dias, enquanto o concreto com a adição de sílica ativa atingiu resistência próxima de 88 MPa na mesma idade. Como o concreto produzido com adição de resíduos de vidro industrial obteve qualidades técnicas de concreto de alto desempenho e de concreto autoadensável, os resultados desta pesquisa foram considerados satisfatórios.
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Studium chování vláknitých materiálových struktur za sníženého tlaku / Study of behavior of fiber structures under low pressureHeliová, Magdaléna January 2019 (has links)
The diploma thesis deals with study of behavior of fibrous organic insulants under greatly reduced pressure (even to vacuum). Development, production and durability of vacuum insulating panels are described in the theoretical part as well as principles of heat transfer. Method for production of core of VIP, created using waste fibers from textile industry and agriculture, is described in the practical part. Verification of behavior during normal and reduced pressure (even to vacuum) was carried out on experimentally made core insulants.
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Parasites Predators and SymbiontsVankeuren, Jody L. 17 June 2021 (has links)
No description available.
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Uma inser??o de recursos institucionais na disciplina de constru??es rurais: o uso de materiais alternativos dispon?veis na microrregi?o de Satuba nas constru??es de instala??es rurais. / An Insertion of Institutional Resources in the Discipline of Rural Constructions: The Use of Alternative Materials Available in Satuba Microregion in the Construction of Rural Facilities.Amorim, Francisco de Assis Ver?osa 21 October 2010 (has links)
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Previous issue date: 2010-10-21 / Within this study, we aimed the participation of students on thirth year of Agriculture Course
in order to awaken, them and through them, the interest of the community surrounding
Federal Agrotechnical School of Satuba/AL for the use of alternative materials, available at
this micro-region, for construction of rural breeding of family subsistence, through alternative
techniques of rustic construction, using " knowledge development " and "design
methodology". Faced with this challenge, the work was organized in four stages. At first
stage, there was the involvement of students through a questionnaire about the possibility of
using alternative materials for rural construction, such as fibers, palm leaves, polypropylene
fiber raffia bags, old tires, PET, clay, etc., followed by the presentation of examples of rustic
buildings and facilities for housing animals, reported in the literature, on the Internet and
orally among the inhabitants of Satuba micro-region. In the second stage, we seek
"knowledge development? based on the construction of diverse animal facilities for family
subsistence production, using alternative materials found in Satuba micro-region, together
with the community. In the third period, we reviewed, cataloged, organized and worked out
an institutional document, as an embryonic proposed model of rustic facilities for breeding,
using techniques and alternative materials, developed at the collective research, in order to
boost an entire productive circle, from the collection of these materials until the construction
of rural facilities for animal production, thus occupying families in an alternative activity,
environmentally adequated, without requiring large investments. On fourth stage, we sought
to evaluate the change that the experience of rural buildings construction with alternative
materials had on the students. It was concluded that the proposal is viable and can be
incorporated into the community, with students help, as a process of knowledge elaboration. / No presente trabalho, buscou-se a participa??o de alunos dos terceiros anos do Curso de
Agropecu?ria com o intuito de despertar, neles e por meio deles, o interesse da comunidade
circunvizinha ? Escola Agrot?cnica Federal de Satuba/AL, para a utiliza??o dos materiais
alternativos dispon?veis na sua microrregi?o, para constru??o de instala??es rurais de cria??es
de animais de subsist?ncia familiar. Para isso se usou as t?cnicas alternativas r?sticas de
constru??o civil, as quais foram ?desconstru?das? e ?reconstru?das? atrav?s da ?elabora??o do
conhecimento? e da ?metodologia de projetos? com o intuito de adapt?-las as constru??es de
instala??es de cria??es animais. Diante desse desafio, o trabalho foi organizado em quatro
momentos. No primeiro momento, ocorreu o envolvimento dos alunos, por meio de um
question?rio sobre a possibilidade de uso de materiais alternativos na constru??o rural, com
fibras, folhas de palmeiras, sacos de fibra de r?fia e polipropileno, pneus velhos, embalagem
PET, argila, etc. E, por conseguinte se apresentou exemplos de constru??es r?sticas para
moradias humanas e instala??es zoot?cnicas, existentes na literatura, internet e tamb?m as
difundido popularmente entre os moradores da microrregi?o de Satuba. No segundo
momento, se buscou atrav?s da ?elabora??o do conhecimento? construir as instala??es
animais mais utilizadas na circunvizinhan?a na produ??o familiar de subsist?ncia, utilizandose
dos materiais alternativos dispon?veis na microrregi?o de Satuba, e do saber popular. No
terceiro momento, levantou-se, organizou-se e elaborou-se um documento para utiliza??o
institucional, com t?cnicas de instala??es r?sticas tradicionalmente consolidadas, para assim,
com a ?constru??o do conhecimento? despertasse nos alunos, poss?veis desenvolvimentos de
novas id?ias para as constru??es de instala??es r?sticas para cria??o de animais. Bem assim
motivar todo um c?rculo produtivo, desde a coleta desses materiais at? a constru??o de
instala??es rurais para produ??o animal, ocupando as fam?lias em uma atividade alternativa,
ecologicamente correta, sem exigir grandes investimentos. No quarto momento, buscou-se
avaliar com a apresenta??o do mesmo question?rio apresentado no primeiro momento a
modifica??o que a viv?ncia com a constru??o por materiais alternativos exerceu sobre os
alunos. Concluiu-se que a proposta ? vi?vel e pode ser incorporada pela comunidade, com o
aux?lio dos alunos, num processo de elabora??o do conhecimento com aplicabilidade das
t?cnicas de constru??o com materiais alternativos, nas instala??es de cria??es animais.
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Obten??o e caracteriza??o de farinha de frutas e vegetais atrav?s do uso de um sistema de secagem solar de baixo custoCosta, Jo?o Batista Sousa 27 August 2010 (has links)
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Previous issue date: 2010-08-27 / In this work a solar drying system for food dehydration was developed. It is a
direct exposition drying apparatus that uses solar energy to heat the circulating air. First,
the construction and assembly of this apparatus was described, in which was used scrap
wraps of used tires for thermal insulation, allowing the reuse of solid waste, being an
ecologically correct recycling option. After, the results obtained in experiments for
cashew drying showed the thermal and economical feasibility of the proposed solar
drying system, focusing on the process of flour production and in its chemical
characterization. It was also demonstrated the social importance of this production for
socially excluded people, since the value added to this fruit, in relation to its in nature
form, may represent an option for job and income generation. The main features of the
proposed dryer are its low cost and its easy fabrication and assembly process. After
cashew drying, the obtained product was processed into flour by using a knife mill and
it was added crushed rapadura to reduce the rancid taste caused by tannin / Apresenta-se um sistema de secagem solar para a desidrata??o de alimentos
utilizando um secador de exposi??o direta que trabalha em regime de circula??o natural.
Abordam-se os processos de constru??o e montagem desse secador que utiliza isolante
t?rmico de raspa de pneu, permitindo a reutiliza??o de materiais, constituindo-se numa
op??o ambientalmente correta de reciclagem. O trabalho apresenta resultados de testes
realizados para a secagem do caju que atestam as viabilidades t?rmicas e econ?micas do
sistema de secagem solar proposto enfocando o processo de produ??o da farinha e
an?lises qu?micas para caracteriz?-la. Ser? tamb?m demonstrada a import?ncia social
que essa produ??o representa para a popula??o mais exclu?da uma vez que o valor
agregado a essa fruta, em rela??o ao in natura, pode representar uma op??o de gera??o
de emprego e renda. As principais caracter?sticas do secador proposto s?o seu baixo
custo e simples processo de fabrica??o e montagem. Ap?s seco o caju foi transformado
em farinha por meio de um moinho de faca, e posteriormente, foi adicionada rapadura
triturada para amenizar o sabor ran?oso provocado pelo tanino
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Strategies for Carbon Dioxide Reduction in Scaffolding Sheets : A Case Study of Xervon Sweden ABBarth, Hampus January 2024 (has links)
This bachelor thesis investigates strategies for enhancing sustainability in material usage within Xervon Sweden AB, a leading provider of scaffolding and weather protection solutions. The research integrates life cycle analysis (LCA) with the exploration of alternative materials and recycling methods to identify environmentally friendly approaches to managing plastic waste in facade work. The study employs a comprehensive LCA to assess the environmental impact of current scaffolding materials, including High-Density Polyethylene (HDPE) and Low-Density Polyethylene (LDPE). It explores new materials such as Polyhydroxyalkanoates (PHA), evaluates their feasibility through data collection and analysis, and investigates innovative recycling and reuse methods in collaboration with industry partners. The results from this bachelor thesis revealed from the LCA that material extrusion contributes significantly to CO2 emissions and energy consumption. PHA emerged as a promising alternative due to its renewable sourcing and biodegradability, despite its higher cost. The study also identified a circular system for recycling scaffolding sheets into granules for manufacturing new sheets as the most efficient strategy for CO2 reduction. Additionally, opportunities for external reuse of plastic materials with painting companies and agricultural associations were explored. The conclusions drawn in this bachelor thesis is that Xervon is currently using the most sustainable material within its price range. While PHA shows potential for future adoption, creating a circular system for scaffolding sheets offers immediate benefits. Collaborations with external partners can further extend the lifespan of materials, contributing to overall sustainability efforts. Future research should include broader sustainability indicators and in-house laboratory tests to validate findings. By focusing on these strategies, Xervon can significantly reduce its environmental footprint while maintaining operational efficiency and economic viability. / Denna kandidatuppsats undersöker strategier för att förbättra hållbarheten i materialanvändningen inom Xervon Sweden AB, en ledande leverantör av ställnings- och väderskyddslösningar. Forskningen integrerar livscykelanalys (LCA) med utforskning av alternativa material och återvinningsmetoder för att identifiera miljövänliga metoder för hantering av plastavfall i fasadarbeten. Studien använder en omfattande LCA för att bedöma den miljöpåverkan som de nuvarandeställningsmaterialen, inklusive högdensitetspolyeten (HDPE) och lågdensitetspolyeten (LDPE), har. Den utforskar nya material såsom polyhydroxialkanoater (PHA), utvärderar deras genomförbarhet genom datainsamling och analys, och undersöker innovativa återvinnings- och återanvändningsmetoder i samarbete med industripartners. Resultaten från denna kandidatuppsats avslöjade från LCA att materialextrudering bidrar avsevärt till koldioxidutsläpp och energiförbrukning. PHA visade sig vara ett lovande alternativ på grund av dessförnybara källor och biologiska nedbrytbarhet, trots dess högre kostnad. Studien identifierade också ett cirkulärt system för återvinning av ställningsdukar till granulat för tillverkning av nya dukar som den mest effektiva strategin för att minska koldioxidutsläpp. Dessutom undersöktes möjligheter för extern återanvändning av plastmaterial med måleriföretag och jordbruksorganisationer. Slutsatserna som dragits i denna kandidatuppsats är att Xervon för närvarande använder det mest hållbara materialet inom sin prisklass. Även om PHA visar potential för framtida användning, erbjuder skapandet av ett cirkulärt system för ställningsdukar omedelbara fördelar. Samarbeten med externa partners kan ytterligare förlänga materialens livslängd och bidra till övergripande hållbarhetsinsatser. Framtida forskning bör inkludera bredare hållbarhetsindikatorer och laboratorietester internt för att valideraresultaten. Genom att fokusera på dessa strategier kan Xervon avsevärt minska sitt miljöavtryck samtidigt som de bibehåller operativ effektivitet och ekonomisk lönsamhet
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Wartime huts : the development, typology, and identification of temporary military buildings in Britain, 1914-1945Draper, Karey Lee January 2018 (has links)
The use of temporary, prefabricated buildings in Britain during the twentieth century arose from wartime need to provide better, and perhaps more importantly, portable shelter for troops and equipment. This thesis provides the first comprehensive list of hut designs for the First and Second World Wars. The full lists and descriptions of each hut are given in the appendices. These lists, 20 types for the First World War and 52 from the Second World War, show the huge range and scope of the huts used and is the major contribution of this thesis. The concentration here is on generic types. Some huts were designed as one-offs and there is no possible way to catalogue these. This thesis has focused instead on those designs or industrially-produced types, which were meant to be produced en-masse as generic solutions to the problem: the sort of hut that might justifiably be given a name (such as a ‘Tarran’, a ‘Seco’, etc.). This thesis provides essential information enabling historians to be able to identify these types. It uses primary and secondary sources to trace the development of these huts and the effect that wartime shortages had on their design. Beginning with the earliest examples of temporary military building, it then focuses on the huts of the First and Second World Wars followed by a study of huts grouped in chapters by material. This research shows that the wartime period pushed industry to make giant leaps forward with construction methods and materials in just a few short years, where otherwise it may have taken decades. This thesis aims to provide the first overview of this process and to enable future researchers to identify and understand the development of these important wartime structures, many of which survive to this day.
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Návrh objektu využívajícího alternativní materiály se zohledněním požadavků na trvale udržitelný rozvoj / Design of a building using alternative materials with respect to the requirements for sustainable developmentDvořák, Jakub January 2019 (has links)
This diploma thesis deals with the design of a small family house, which construction uses alternative building materials. The first part of the thesis is devoted to the world, European and Czech legislation related to sustainable development. The concept of ecological construction, which focuses on the possibilities of reducing the negative impacts of construction production on the environment at various stages of construction and on energy, material, water and waste management, is also presented. The thesis also describes advantages and disadvantages of particular solutions. In the second part of the thesis, which based on theoretical knowledge, is the design of a family house from alternative materials worked out. The design of the study in the scale of 1:100 consists of measured floor plan drawings of all storeys, characteristic measured section drawings, layout plans with displayed furniture and equipment, elevation drawings of particular facades, roof drawings and situation design. The drawing part is accompanied by a text part. The processed design is compared to the reference building and then evaluated from the point of view of functional, economic, environmental and social requirements.
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