Дисертації з теми "Rubber behavior"
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Euchler, Eric, Radek Stocek, Michael Gehde, Jörg-Michael Bunzel, Wolfgang Saal, and Reinhold Kipscholl. "Fracture behavior of rubber powder modified rubber blends applied for conveying belt top covers." Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-198136.
Повний текст джерелаEuchler, Eric, Radek Stocek, Michael Gehde, Jörg-Michael Bunzel, Wolfgang Saal, and Reinhold Kipscholl. "Fracture behavior of rubber powder modified rubber blends applied for conveying belt top covers." Technische Universität Chemnitz, 2014. https://monarch.qucosa.de/id/qucosa%3A20409.
Повний текст джерелаBacigalupo, Lauren N. "Fracture behavior of nano-scale rubber-modified epoxies." Thesis, Lehigh University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3598871.
Повний текст джерелаThe primary focus of the first portion of this study is to compare physical and mechanical properties of a model epoxy that has been toughened with one of three different types of rubber-based modifier: a traditional telechelic oligomer (phase separates into micro-size particles), a core-shell latex particle (preformed nano-scale particles) and a triblock copolymer (self-assembles into nano-scale particles). The effect of modifier content on the physical properties of the matrix was determined using several thermal analysis methods, which provided insight into any inherent alterations of the epoxy matrix. Although the primary objective is to study the role of particle size on the fracture toughness, stiffness and strength were also determined since these properties are often reduced in rubber-toughened epoxies. It was found that since the CSR- and SBM-modified epoxies are composed of less rubber, thermal and mechanical properties of the epoxy were better maintained. In order to better understand the fracture behavior and mechanisms of the three types of rubber particles utilized in this study, extensive microscopy analysis was conducted. Scanning transmission electron microscopy (STEM) was used to quantify the volume fraction of particles, transmission optical microscopy (TOM) was used to determine plastic damage zone size, and scanning electron microscopy (SEM) was used to assess void growth in the plastic zone after fracture. By quantifying these characteristics, it was then possible to model the plastic damage zone size as well as the fracture toughness to elucidate the behavior of the rubber-modified epoxies. It was found that localized shear yielding and matrix void growth are the active toughening mechanisms in all rubber-modified epoxies in this study, however, matrix void growth was more prevalent. The second portion of this study investigated the use of three acrylate-based triblocks and four acrylate-based diblocks to modify a model epoxy system. By varying block lengths and the polarity of the epoxy-miscible blocks, a variety of morphologies were generated (such as spherical micelles, layer particles and worm-like micelles). It was found that in some cases, the epoxy-miscible block did not yield domains substantial enough to facilitate increases in toughness. Overall, the thermal and mechanical properties of the acrylate-based triblock- and diblock-modified epoxies were found to be similar to CTBN-modified epoxy, which was used as a control. However, there were properties that were improved with the acrylate-based diblock-modified epoxies when compared to the acrylate-based triblock modified epoxies. Specifically, the viscosity penalty of the diblock-modified epoxies was shown to be a marked improvement over the triblock-modified epoxies, especially given that the fracture toughness values are similar. This reduction in the viscosity penalty becomes an important criterion when considering processing procedures and applications. Additionally, comparing the morphology of the resulting modified-epoxies utilizing atomic force microscopy (AFM) and scanning electron microscopy (SEM) led to a better understanding of the relationship between the particle morphology obtained and the physical properties of the acrylate-based rubber-modified epoxy systems in this research.
JARAMILLO, NATALIA ANDREA DURÁN. "MECHANICAL BEHAVIOR OF SOILS REINFORCED WITH TIRES RUBBER." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2016. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=27554@1.
Повний текст джерелаCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
O volume de pneus inservíveis continua aumentando a cada ano, se tornando um tema de grande preocupação para a sociedade. Motivados por esta problemática ambiental, o presente estudo experimental propõe utilizar a borracha de pneu triturada como reforço de solos, em duas diferentes granulometrias (chips e fibras), como material alternativo para o reforço de dois tipos de solos (areia e solo argiloso). Com este fim realizaram-se ensaios mecânicos, tais como ensaios de compactação proctor standard, ensaios triaxiais do tipo consolidado e isotropicamente drenado e ensaios de adensamento unidimensional, para avaliar os efeitos da granulometria da borracha de pneu, triturada em chips e fibras (com os tamanhos médios de 4,6 mm e 2 mm, respectivamente) e do teor de borracha de pneu (5, 10 por cento e 15 por cento em relação à massa de solo seco), no comportamento mecânico de misturas de areia-borracha e de misturas solo argiloso-borracha. Os resultados mostraram que tanto os chips como as fibras de pneu de borracha contribuem no aumento dos parâmetros de resistência ao cisalhamento de ambos os solos e aumentam a energia de deformação absorvida durante o cisalhamento. Ao analisar a resposta obtida em ambos os solos, se evidencia que, tanto para a argila quanto para a areia, foi mais efetivo o reforço com 10 por cento de fibras de borracha de pneu. Todos os compósitos estudados possuem características de resistência que poderiam cumprir as exigências de determinadas obras geotécnicas (aterros sobre solos moles, reforço de taludes, solo de base de fundações superficiais), portanto o uso da borracha de pneu como reforço de solos contribuiria com o menor consumo de material natural e redução dos custos de transporte e volume de material mobilizado.
The volume of discarded tires continues to increase each year, becoming a major topic of concern for society. Motivated by this environmental issue, this experimental study proposes using tire chips and tire buffings as an alternative material to improve the shear strength of two types of soil (sand and clayey soil). Because of this, standard Proctor compaction tests, consolidated-drained triaxial tests and compressibility tests were performed to assess the influence of tire rubber particle size, (with average sizes of 4.6 mm and 2 mm, respectively) and tire rubber content (5, 10 percent and 15 percent by dry weight of soil) into the mechanical behavior of sand and clayey soil. The tests results showed that both, chips and buffings contribute increasing the shear strength parameters of both the soil and increase the strain energy absorbed during the shear phase. By analyzing, the mechanical response both for clayey soil and for sand was found that the best shear strength improvement was obtained at 10 percent of tire buffings. All the composites showed resistance characteristics that would ensure the requirements for many geotechnical applications (embankments over soft soils, slope reinforcement and surface foundations), so the use of waste tires as a reinforcement material would help solve problems associated with natural resources and reducing transportation costs and earthmoving.
Euchler, Eric, Gert Heinrich, Hannes Michael, Michael Gehde, Radek Stocek, Ondrej Kratina, Reinhold Kipscholl, Jörg-Michael Bunzel, and Wolfgang Saal. "Fundamental studies on dynamic wear behavior of SBR rubber compounds modified by SBR rubber powder." Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-198870.
Повний текст джерелаEuchler, Eric, Gert Heinrich, Hannes Michael, Michael Gehde, Radek Stocek, Ondrej Kratina, Reinhold Kipscholl, Jörg-Michael Bunzel, and Wolfgang Saal. "Fundamental studies on dynamic wear behavior of SBR rubber compounds modified by SBR rubber powder." Deutsche Kautschuk-Gesellschaft e.V, 2015. https://monarch.qucosa.de/id/qucosa%3A20419.
Повний текст джерелаSuttipong, Angthong. "Role of the Rubber Cooperatives in Thailand in Improving Smallholders' Incomes: Empirical Study in Traditional and Non-traditional Rubber Production Areas." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263768.
Повний текст джерелаRIBEIRO, PHILLIPE MOURAO. "MECHANICAL BEHAVIOR OF BENTONITE REINFORCED WITH GROUND RUBBER AND PET FLAKES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=36542@1.
Повний текст джерелаCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
As atuais técnicas propostas para a destinação final dos pneus não são 100 por cento eficientes, existindo um grande déficit do material em questão. Um outro material que necessita de uma destinação final é o PET (polietileno tereftalato), que hoje em dia, apesar da grande quantidade reciclada, necessita de mais opções de destinação. O estudo apresentado propõe a utilização da borracha triturada (em forma de fibras e em pó - granulometria inferior a 2mm) em diferentes teores (de 5 por cento e 10 por cento, em relação ao peso seco da bentonita) e do PET triturado (na forma de fibras e em pó), como reforço de uma bentonita, para aumento dos parâmetros de resistência desta. O objetivo da pesquisa consiste em avaliar a possibilidade da utilização da borracha e do PET como melhoramento de bentonita em obras geotécnicas, como por exemplo em camadas impermeabilizantes para aterros sanitários, visto que com a utilização da borracha e do PET em obras geotécnicas seria possível a destinação de um grande volume desses materiais. Para o desenvolvimento do estudo experimental foram realizados ensaios de caracterização física e de caracterização mecânica, como ensaios de cisalhamento direto e adensamento. Com resultados obtidos a partir dos ensaios de cisalhamento direto e ensaio de adensamento, pode se perceber que as misturas B90BF10 e B90PETT10 se mostraram mais favoráveis a utilização como barreira impermeabilizando para aterros sanitários, tendo em vista o aumento nas resistências de Pico, pós pico e residual, além do aumento do coeficiente de adensamento (cv) e redução da permeabilidade (k).
The current techniques proposed for the final destination of the tires are not 100 percent efficient, and there is a great deficit of the material in question. Another material that needs an end destination is the PET (polyethylene terephthalate), which nowadays, despite the large amount recycled, needs more disposal options. the present study proposes the use of crushed rubber (in the form of fibers and powder - granulometry of less than 2 mm) in different contents (5 percent and 10 percent, in relation to the dry weight of bentonite) and crushed PET (in the form of fibers and powder), as reinforcement of a bentonite, to increase the resistance parameters of this one. The objective of the research is to evaluate the possibility of using rubber and PET as an improvement of bentonite in geotechnical works, such as waterproofing layers for sanitary landfills, since with the use of rubber and PET in geotechnical works it would be possible to allocate a large volume of these materials. For the development of the experimental study, physical characterization and mechanical characterization tests were performed, such as direct shear tests and densification. With results obtained from the direct shear tests and the densification test, it can be seen that the mixtures B90BF10 and B90PETT10 were more favorable to use as a waterproofing barrier for sanitary landfills, in view of the increase in peak and residual, besides the increase of the coefficient of densification (cv) and reduction of the permeability (k).
Warley, Russell Lee. "Silica-silicone interactions: Non-linear viscoelastic behavior of silica-filled silicone rubber." Case Western Reserve University School of Graduate Studies / OhioLINK, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=case1057089336.
Повний текст джерелаBroussard, Dylan W. "Cyclic Behavior of Small Scale Shear Panels Containing Fiber Reinforced Rubber Concrete." Thesis, University of Louisiana at Lafayette, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10002460.
Повний текст джерелаShear beams and shear walls were constructed using varying amounts of steel fibers and rubber to determine the effect of these constituents on concrete when subject to shear loads and reversed cyclic loadings. 22 concrete beams were tested using mixes with differing amounts of fibers and rubber. The beams were designed to fail in shear by applying a single downward point load at midspan using a MTS Universal Testing Machine. Using the recorded load and displacement data the behavior of each beam and the shear strength contribution for each mix were determined. For all mixes that included fibers and/or rubber the shear strengths increased 12% to 56% in comparison to the plain concrete mixes. Four concrete walls were also tested using four of the 22 beam mixes. The four selected mixes were chosen based on the comparable compressive strengths and mix constituents. The walls were designed to fail in shear by applying a lateral load to a top block cast on top of the shear wall. The walls were tested on a modular strong-block test system within a rigid steel frame so that the load could be applied by a hydraulic actuator. During testing, the displacement at 10 selected locations, the loads placed on the walls at each displacement, and the behavior were recorded and analyzed. The walls containing rubber experienced lower strengths, a brittle failure with severe spalling and damage, and dissipated a low amount of energy. The walls containing fibers exhibited strain hardening characteristics leading to a ductile failure mode, higher strengths, and little web damage. Using the findings from this study, it can be concluded that both fibers and rubber can be used to increase shear strength but only fibers were found to be a viable option for application in walls subject to reverse cyclic loadings.
Pole, Sandeep. "Constitutive Modeling of the Rheological Behavior of Rubber Compounds and Plastic Composites." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron155567239888512.
Повний текст джерелаOhlemacher, Crittenden John. "Double Network Formation During Aging of a Natural Rubber Vulcanizate." University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1132327518.
Повний текст джерелаSujarwo, Rakhma [Verfasser]. "Palm Oil and Rubber Price and Trader’s Behavior at International towards Local Level / Rakhma Sujarwo." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2021. http://d-nb.info/1235757137/34.
Повний текст джерелаITOH, Yoshito, Haosheng GU, Kazuya SATOH, Yukihiro KUTSUNA, 義人 伊藤, 浩声 顧, 和也 佐藤, and 幸浩 忽那. "EXPERIMENTAL INVESTIGATION ON AGEING BEHAVIORS OF RUBBERS USED FOR BRIDGE BEARINGS." 土木学会, 2006. http://hdl.handle.net/2237/8622.
Повний текст джерелаMusigamart, Natedao. "Study of the role of lipids from maturated coagula from Hevea brasiliensis latex on natural rubber behavior in oxidative conditions." Thesis, Montpellier, SupAgro, 2015. http://www.theses.fr/2015NSAM0004/document.
Повний текст джерелаNatural rubber (NR), a derived product from H. brasiliensis latex, is known for its high mechanical properties that are, for some, superior to those of its synthetic counterparts. However, the high degree of unsaturation of poly(cis-1,4-isoprene) makes it susceptible to thermo-oxidation. Fortunately, NR is endowed with non-isoprene components of which some have antioxidant properties. Especially, lipids, the main non-isoprene component retained in NR, have been reported to contain antioxidant substances, especially tocotrienols. It is well known that during the maturation of latex coagula, both NR physical properties and chemical composition are altered, but the complex mechanisms of this alteration are still to be elucidated. In the present work, the evolution of some native antioxidant molecules during maturation was followed in relation with some physical properties. Two experimental conditions of maturation were chosen. The first experiment involved uncontrolled conditions based on traditional unsmoked (USS) or ribbed smoked sheet (RSS) processing, while the second was performed in a dedicated maturation device with full control of environmental factors (relative humidity, temperature and oxygen content) followed by a processing based on that of Technically Specified Rubber (TSR). The evolution of samples during maturation was studied at different scales: bulk properties (P0, P30 and PRI), mesostructure (% gel content, Mw and Mn) and biochemical composition (lipids components). In parallel, in vitro antioxidant activity of NR lipid extracts was also investigated using an optimized DPPH method. Lipid quantity and quality evolved during maturation, especially under aerobic conditions. The total amount of lipid extract decreased, with a release of free fatty acids at early stage of maturation followed by a later decrease, unsaturated fatty acids being the first to disappear. The amount of extractable free γ-tocotrienol did not change much during maturation, while its esterified form was enriched in saturated fatty acids. The antioxidant activity measured in vitro correlated well with free γ-tocotrienol concentration but not with the resistance of rubber to thermo-oxidation assessed by P30 or PRI. Indeed, the in vitro conditions of measurement were far from those occurring inside rubber material. The localization of antioxidants in rubber and especially their physical possibility to interact with the double bonds of poly(cis-1,4-isoprene) or with oxidant species should be further investigated to understand what drives the drop of P30 along maturation time. Non extractable lipids or more polar non-isoprene molecular species (proteins, polyphenols, etc…) could also influence the resistance to thermo-oxidation
TESSARI, CIRO LOYOLA. "ANALYSIS OF THE CEMENT-TREATED AGGREGATE BASE MATERIAL BEHAVIOR WITH A TIRE RUBBER ADDITION FOR PAVEMENTS BASE APPLICATIONS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2017. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=33692@1.
Повний текст джерелаCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
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.
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.
Mousa, A., G. Heinrich, and U. Wagenknecht. "Thermal properties of carboxylated nitrile rubber/nylon-12 composites-filled lignocellulose materials." Sage, 2014. https://tud.qucosa.de/id/qucosa%3A35546.
Повний текст джерелаIvanoska-Dacikj, Aleksandra, Gordana Bogoeva-Gaceva, René Jurk, Sven Wießner, and Gert Heinrich. "Assessment of the dynamic behavior of a new generation of complex natural rubber-based systems intended for seismic base isolation." Sage, 2017. https://tud.qucosa.de/id/qucosa%3A35604.
Повний текст джерелаJin, Min. "Determination of fracture mechanics behavior of polyethylene sheets." Thesis, Linnéuniversitetet, Institutionen för maskinteknik (MT), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-65706.
Повний текст джерелаCraig, McKinzie King Kimi Lynn. "Rubber stamps and litmus tests the president, the senate, and judicial voting behavior in abortion cases in the U.S. federal district courts /." [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-3985.
Повний текст джерелаCraig, McKinzie. "Rubber Stamps and Litmus Tests: The President, the Senate, and Judicial Voting Behavior in Abortion Cases in the U.S. Federal District Courts." Thesis, University of North Texas, 2007. https://digital.library.unt.edu/ark:/67531/metadc3985/.
Повний текст джерелаSubramani, Bhagavatheswaran Eshwaran [Verfasser], Gert [Gutachter] Heinrich, and Jyrki [Gutachter] Vuorinen. "Exploring the Piezoresistive Characteristics of Solution Styrene Butadiene Rubber composites under static and Dynamic Conditions - A Novel Route to Visualize Filler Network Behavior in Rubbers / Eshwaran Subramani Bhagavatheswaran ; Gutachter: Gert Heinrich, Jyrki Vuorinen." Dresden : Technische Universität Dresden, 2019. http://d-nb.info/1226899161/34.
Повний текст джерелаMerckel, Yannick. "Experimental characterization and modeling of the mechanical behavior of filled rubbers under cyclic loading conditions." Phd thesis, Ecole Centrale de Lille, 2012. http://tel.archives-ouvertes.fr/tel-00736624.
Повний текст джерелаAli, Mahdi. "Study of the bitumen aging effects on the rheological properties and fatigue behavior." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16255/.
Повний текст джерелаAbebe, Abay Damte, and Qikang He. "Foam Behavior Analysis Based On A Force Measurement System." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-37250.
Повний текст джерелаOzdemir, Gokhan. "Response Of Isolated Structures Under Bi-directional Excitations Of Near-field Ground Motions." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/3/12612039/index.pdf.
Повний текст джерелаPagoto, Leticia Martelo. "Estudo do comportamento à água em argamassas de revestimento incorporadas com borracha de pneus /." Ilha Solteira, 2018. http://hdl.handle.net/11449/180293.
Повний текст джерелаResumo: A evolução do processo de industrialização vem desencadeando um consumo desenfreado dos recursos naturais. Diante do exposto, a indústria automobilística contribui em grande escala para a geração de resíduos de pneus, os quais ao serem descartados inadequadamente causam inconvenientes ambientais e de saúde pública. Paralelamente, a borracha proveniente do processo mecânico de recauchutagem de pneus vem sendo utilizada em pesquisas relacionadas ao estudo de variadas propriedades em compósitos cimentícios. Perante isso, este trabalho realizou uma avaliação experimental do comportamento à água de argamassas mistas de revestimento produzidas com a incorporação de duas diferentes granulometrias de borracha de pneus, estudadas segundo a vertente da substituição parcial da areia. O teor de incorporação de borracha de pneus nas argamassas foi de 5%, 10%, 15% e 20%, em volume. As diferentes granulometrias de borracha, provenientes da recauchutagem de pneus, foram doravante denominadas de grossa (passante na peneira #1,19 mm) e fina (passante na peneira #0,60 mm). O programa experimental contou com a execução de ensaios de densidade de massa aparente, retenção de água e índice de consistência nos compósitos no estado fresco; posteriormente, com os compósitos no estado endurecido, foram executados os ensaios de densidade de massa aparente, absorção de água por capilaridade, ensaio de secagem, absorção de água por imersão, permeabilidade ao vapor de água e permeabilidade à água sob press... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The evolution of the industrialization process has triggered an uncontrolled consumption of natural resources. According to this fact, the automobile industry contributes greatly in generation of waste tires, which, with improper disposal, may cause environmental and public health inconveniences. In parallel, the rubber from the mechanical process of tire retreading has been used in researches related to the study of various properties in cement composites. According to it, this work purposed to carry out an experimental evaluation of the behavior to the water of mixed covering mortars produced with the incorporation of two different grades of tire rubber, studied according to the scope of partial sand replacement. The content of tire rubber incorporation in the mortars was 5%, 10%, 15% and 20% by volume. The different grades of rubber from tire retreading were henceforth referred to as thick (passing through the # 1.19 mm sieve) and fine (passing through the # 0.60 mm sieve). The experimental program consisted in the execution of bulk density tests, tests of water retention and consistency index in the fresh state; subsequently, with the composites in the hardened state, bulk density tests, capillary water absorption tests, drying tests, tests of water absorption by immersion, water vapor permeability and water permeability under pressure. The results showed that the incorporation of rubber could contribute positively in most of the studied properties. Thus, among the gradin... (Complete abstract click electronic access below)
Mestre
Bates, Griffin Michael. "Characterizing the Cold Temperature Performance of Guayule (Pathenium argetnatum) Natural Rubber and Improving Processing of Guayule and Agronomic Practices of Taraxacum kok-saghyz." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1448376403.
Повний текст джерелаGough, Julia. "Stress-strain behaviour of rubber." Thesis, Queen Mary, University of London, 2000. http://qmro.qmul.ac.uk/xmlui/handle/123456789/28819.
Повний текст джерелаRush, Jeremy Richard. "Crystal growth, guest ordering and ferroelastic properties of urea inclusion compounds." Diss., Manhattan, Kan. : Kansas State University, 2007. http://hdl.handle.net/2097/526.
Повний текст джерелаHiggins, Daniel. "Frictional behaviour of rubber on ice." Thesis, University of Edinburgh, 2007. http://hdl.handle.net/1842/14063.
Повний текст джерелаWu, Guangchang. "The mechanisms of rubber abrasion." Thesis, Queen Mary, University of London, 2017. http://qmro.qmul.ac.uk/xmlui/handle/123456789/25986.
Повний текст джерелаCanevarolo, Sebastiao V. "Melt behaviour of thermoplastic rubbers." Thesis, Loughborough University, 1986. https://dspace.lboro.ac.uk/2134/27871.
Повний текст джерелаWadham-Gagnon, Matthew. "Hyperelastic modelling of rubber behaviour in finite element software." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99797.
Повний текст джерелаIwnicki, Simon. "The dynamic behaviour of railway vehicles with solid rubber tyres." Thesis, London South Bank University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280821.
Повний текст джерелаSkouvaklis, Gerasimos. "Rubber friction on ice and snow surfaces." Thesis, University of Edinburgh, 2011. http://hdl.handle.net/1842/9582.
Повний текст джерелаPinto, Nayra Alberici [UNESP]. "Compósitos à base de gesso incorporados com resíduos de borracha proveniente do processo de recauchutagem de pneus." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/151166.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
O gesso é o material sintético construtivo mais antigo que se tem notícia, e sua ampla utilização é devido as suas boas propriedades termoacústicas e de resistência ao fogo. No Brasil, seu emprego concentra-se em forros, revestimentos e paredes divisórias, conhecidas como gesso acartonado. Todavia, o gesso é um material sobre o qual existe pouco conhecimento ao nível da investigação. E este projeto se propõe a estudar mais esse material, através da confecção de compósitos a base de gesso com a incorporação de borracha de pneus, tornando-o assim um material sustentável. A borracha proveniente do processo de recauchutagem de pneus inservíveis tem ampla aplicação em pesquisas com concretos e argamassas; porém pouco se sabe sobre sua aplicação no gesso. Para atingir o objetivo proposto nesse trabalho serão feitos ensaios de microscopia eletrônica de varredura, resistência à ruptura na flexão, resistência à compressão, dureza superficial, absorção de água, densidade superficial de massa, consistência (mini-slump) e comportamento térmico. Dessa maneira, é possível afirmar que a incorporação de borracha pode ser interessante para a produção de placas de gesso, uma vez que pode incorporar um resíduo sem destino totalmente adequado, produzindo placas com características semelhantes das já utilizadas e ainda contribuindo em aspectos como densidade, dureza superficial e isolamento térmico. Sendo assim, dentre as granulometrias utilizadas neste estudo, a borracha grossa pode ser considerada a que teve melhor desempenho, uma vez que apresentou características de ser mais trabalhável, menos absorvente e mais isolante termicamente, além de apresentar resistências à compressão e a flexão adequadas para sua utilização (não estrutural), menores mossas e maior leveza do material.
Gypsum is the oldest constructive synthetic material ever heard, and their widespread use is due to its good thermoacoustic properties and fire resistance. In Brazil, its use is focused on linings, coating and partitions, known as drywall. However, the gypsum is a material on which there is little knowledge in terms of research. And this project aims to study more this material through the production of composite gypsum with tire rubber incorporation, thus making it a sustainable material. The rubber from the retreading process scrap tires has wide application in research on concrete and mortar; but little is known about its application in gypsum. In order to reach the objective proposed in this work, scanning electron microscopy, flexural strength, compressive strength, surface hardness, water absorption, bulk density, consistency (mini-slump) and thermal behavior will be performed. In this way, it is possible to affirm that the incorporation of rubber can be interesting for the production of gypsum boards, since it can incorporate a residue without destination completely, producing plates with characteristics similar to those already used and still contributing in aspects such as density, surface hardness and thermal insulation. Thus, among the granulometries used in this study, the thick rubber can be considered the one that had better performance, since it presented characteristics of being more workable, less absorbent and more thermally insulating, besides presenting resistance to compression and flexion adequate for its use (non-structural), smaller dents and greater lightness of the material.
FAPESP: 2015/17658-4
Pinto, Nayra Alberici. "Compósitos à base de gesso incorporados com resíduos de borracha proveniente do processo de recauchutagem de pneus /." Ilha Solteira, 2017. http://hdl.handle.net/11449/151166.
Повний текст джерелаResumo: O gesso é o material sintético construtivo mais antigo que se tem notícia, e sua ampla utilização é devido as suas boas propriedades termoacústicas e de resistência ao fogo. No Brasil, seu emprego concentra-se em forros, revestimentos e paredes divisórias, conhecidas como gesso acartonado. Todavia, o gesso é um material sobre o qual existe pouco conhecimento ao nível da investigação. E este projeto se propõe a estudar mais esse material, através da confecção de compósitos a base de gesso com a incorporação de borracha de pneus, tornando-o assim um material sustentável. A borracha proveniente do processo de recauchutagem de pneus inservíveis tem ampla aplicação em pesquisas com concretos e argamassas; porém pouco se sabe sobre sua aplicação no gesso. Para atingir o objetivo proposto nesse trabalho serão feitos ensaios de microscopia eletrônica de varredura, resistência à ruptura na flexão, resistência à compressão, dureza superficial, absorção de água, densidade superficial de massa, consistência (mini-slump) e comportamento térmico. Dessa maneira, é possível afirmar que a incorporação de borracha pode ser interessante para a produção de placas de gesso, uma vez que pode incorporar um resíduo sem destino totalmente adequado, produzindo placas com características semelhantes das já utilizadas e ainda contribuindo em aspectos como densidade, dureza superficial e isolamento térmico. Sendo assim, dentre as granulometrias utilizadas neste estudo, a borracha grossa pode ser consider... (Resumo completo, clicar acesso eletrônico abaixo)
Mestre
Oba, Takeshi. "The fatigue behaviour of toughened epoxy polymers." Thesis, Imperial College London, 1999. http://hdl.handle.net/10044/1/11431.
Повний текст джерелаRahman, Mohd Tahir Bin Abdul. "Further studies of the stress relaxation behaviour of rubber in compression." Thesis, Loughborough University, 1985. https://dspace.lboro.ac.uk/2134/7300.
Повний текст джерелаLind, Petter. "A finite element material modelingtechnique for the hysteretic behaviour of reinforced rubber." Thesis, KTH, Hållfasthetslära (Avd.), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-223949.
Повний текст джерелаFörstärkt gummi används, tack vare sina elastiska och dissipativa egenskaper, i industriella komponenter som exempelvis bussningar i drivlinan, däck och flexibla gummikopplingar. Dissipationen orsakas av materialförluster som i sin tur orsakas av interaktioner på längdskalor kortare än micro-nivå i materialet. Dessa Interaktioner resulterar i ett material som mekaniskt kan klassificeras som ett ickelinjärt material beroende av töjningsamplitud, töjningshastighet och temperatur. Det är därför en utmaning att göra modeller som på ett korrekt sätt förutsäger beteendet för gummikomponenter och egenskaper relaterade till dessa, som exempelvis rullmotståndet i ett däck. Det är även svårt att ge generella design riktlinjer för dessa komponenter på grund gummits många materialberoenden och enkla användvändbara fenomenologiska modeller som kan underlätta vid sådana processer är därför högt efterfrågade av industrin idag. I denna rapport presenteras en materialmodell för att modellera töjningsamplitud och töjningshastighetsberoendet för gummi under cyklisk last samt en metod för att välja dess materialparametrar. Den föreslagna materialmoddeleringstekniken resulterar i en modell med samma töjningshastighetsberoende för alla töjningsamplituder. En approximation som är användbar inom ett antal decader av töjningsamplituder och töjningshastigheter vilket borde vara tillräckligt för de flesta industriella tillämpningar idag. Den föreslagna materialmodellen kan dessutom implementeras i kommersiella FEprogramvaror genom att endast använda i programmet inbyggda materialmodeller. Detta sker genom tillämpning av overlay-metoden. I rapporten presenteras även en metod förhur modelleringstekniken kan implementeras genom en tillämpning i simuleringar med syfte att bestämma rullmotståndet för ett lastbilsdäck.
Tsunoda, Katsuhiko. "The role of visco-elasticity on the crack growth behaviour of rubber." Thesis, Queen Mary, University of London, 2001. http://qmro.qmul.ac.uk/xmlui/handle/123456789/28950.
Повний текст джерелаXiao, Keqin. "Fracture behaviour of rubber-modified epoxies and their carbon fibre-reinforced composites." Thesis, The University of Sydney, 2000. https://hdl.handle.net/2123/27762.
Повний текст джерелаShorter, Robert. "The mechanical behaviour of elastomers when hollow microspheres are used as a particulate filler." Thesis, Queen Mary, University of London, 2014. http://qmro.qmul.ac.uk/xmlui/handle/123456789/9092.
Повний текст джерелаKind, David J. "Formulation and burning behaviour of fire retardant polyisoprene rubbers." Thesis, University of Central Lancashire, 2011. http://clok.uclan.ac.uk/2815/.
Повний текст джерелаCaborgan, Rodica. "Contribution à l’analyse expérimentale du comportement thermomécanique du caoutchouc naturel." Thesis, Montpellier 2, 2011. http://www.theses.fr/2011MON20203/document.
Повний текст джерелаAn analysis of the thermomechanical behavior of the natural rubber is carried out by combining two quantitative imaging techniques. The digital image correlation of visible images is used to estimate the strain and then the deformation energy whereas infrared images make it possible to estimate, via the heat equation, the amounts of heat involved in the material transformation. The construction of energy balance enables us to determine the relative importance of the dissipative and thermomechanical coupling mechanisms. For low frequency and low extension ratio, the results show the famous thermoelastic inversion effect. From an energy standpoint, a competition between entropic elasticity and stress-induced crystallization/fusion mechanisms is observed for more significant extension ratios. No significant dissipative effect can be detected at low or high loading frequency whereas in each case, a stress-strain hysteresis characterizes the cyclic response of the material
Nehr, Jonas Christian. "Damping and Thermomechanical behaviour of CFRP laminates modified with rubbery nanofibers." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21702/.
Повний текст джерелаNajim, Khalid Battal. "Determination and enhancement of mechanical and thermo-physical behaviour of crumb rubber-modified structural concrete." Thesis, University of Nottingham, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.587844.
Повний текст джерелаAwang, Ngah Shamsiah. "Static and fatigue behaviour of fibre composites infused with rubber- and silica nanoparticle-modified epoxy." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/14432.
Повний текст джерелаRao, Tingling. "Effect of Crosslink Density and N660 Carbon Black on Tearing Behaviors of Natural Rubber Vulcanizates." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1347122467.
Повний текст джерела