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1
Wienand, Ian Raymond Computer Science & Engineering Faculty of Engineering UNSW. "Transparent large-page support for Itanium linux." Publisher:University of New South Wales. Computer Science & Engineering, 2008. http://handle.unsw.edu.au/1959.4/41021.
Testo completoAbstract (sommario):
The abstraction provided by virtual memory is central to the operation of modern operating systems. Making the most efficient use of the available translation hardware is critical to achieving high performance. The multiple page-size support provided by almost all architectures promises considerable benefits but poses a number of implementation challenges. This thesis presents a minimally-invasive approach to transparent multiple page-size support for Itanium Linux. In particular, it examines the interaction between supporting large pages and Itanium's two inbuilt hardware page-table walkers; one being a virtual linear page-table with limited support for storing different page-size translations and the other a more flexible but higher overhead hash table based translation cache. Compared to a single-page-size kernel, a range of benchmarks show performance improvements when multiple page-sizes are available, generally large working sets that stress the TLB. However, other benchmarks are negatively impacted. Analysis shows that the increased TLB coverage, resulting from the use of large pages, frequently does not reduce TLB miss rates sufficiently to make up for the increased cost of TLB reloads. These results, which are specific to the Itanium architecture, suggest that large-page support for Itanium Linux is best enabled selectively with insight into application behaviour.
2
Kim, Hong-Joong. "Evaluation of Superpave and modified Superpave mixtures by means ofAccelerated [sic] Pavement Testing." [Gainesville, Fla.] : University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE1001156.
Testo completo
3
Du, Guangli. "Implementation of the SuperPave IDT analysis procedure." Thesis, KTH, Väg- och banteknik (stängd 20110301), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-52983.
Testo completoAbstract (sommario):
Cracking is one of the most severe distress modes of asphaltpavements. Thus characterising the fracture resistance properties of asphaltmixtures is the key issue for improving the performance relatedmixture design. The present master thesis project addresses the implementationof the theoretical framework, which is used to characterise thefracture resistance of mixtures based on the SuperPave indirect tensiletest (IDT). An open source Matlab-based software for analysing resilientmodulus, Poisson’s ratio, creep parameters and fracture resistance parametershas been developed. The software analyses the the IDT results, toestimate mixture’s fracture resistance based on hot mix asphalt FractureMechanics. Predictions form the field specimens concerning the fractureresistance obtained from IDT are compared with observed field performance.
4
Yildirim, Yetkin. "Mixing and compaction temperatures for superpave mixes /." Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.
Testo completo
5
Rahman, Farhana. "Performance evaluation of 4.75-mm NMAS Superpave mixture." Diss., Manhattan, Kan. : Kansas State University, 2010. http://hdl.handle.net/2097/3893.
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6
Prowell, Brian Douglas Brown E. R. "Verification of the superpave gyratory Ndesign compaction levels." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Spring/doctoral/PROWELL_BRIAN_50.pdf.
Testo completo
7
Uppu, Kiran Kumar. "Durable superpave hot-mix asphalt mixes in Kansas." Thesis, Kansas State University, 2012. http://hdl.handle.net/2097/13595.
Testo completoAbstract (sommario):
Master of Science<br>Department of Civil Engineering<br>Mustaque Hossain<br>A recent study at Kansas State University has shown that asphalt producers in Kansas are producing hot-mix asphalt (HMA) mixtures with lower asphalt contents than those in the job-mix formula. These drier mixtures are thought to be susceptible to moisture. This project evaluated the effect of asphalt content on rutting and moisture resistance of HMA. Two different mixtures and four varying asphalt contents, optimum and lower, were selected. Another large-size mixture with four varying asphalt contents was also studied. The Hamburg Wheel Tracking Device (HWTD)test (TEX-242-F) and the Kansas Standard Test-56 (KT-56), or modified Lottman test, were used to predict moisture damage and rutting potential of these mixes. All specimens tested were prepared with the Superpave gyratory compacter. Results of this study showed the drier mixtures performed better in rutting and were less susceptible to moisture.Asphalt content significantly affects the number of wheel passes in the HWTD test. The study also revealed a weak correlation between asphalt film thickness and performance test results. Thus, the effect of varying asphalt content is nonconclusive from a durability point of view. However, performance simulations using a theoretical model show that very dry mixes in asphalt pavements are likely to have shorter performance lives.
8
Gao, Ya. "Investigation of cracking resistance of recycled Superpave mixtures." Thesis, Kansas State University, 2017. http://hdl.handle.net/2097/38175.
Testo completoAbstract (sommario):
Master of Science<br>Department of Civil Engineering<br>Mustaque A. Hossain<br>The use of economical and environmentally friendly recycled asphalt materials has become increasingly popular for asphalt pavement construction. Although reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS) are typically used in hot-mix asphalt, increasing the amount of RAP and RAS materials increases the potential for premature pavement distresses, especially cracking. This research evaluated four recycled Superpave mixtures with different RAP and RAS contents from Kansas Department of Transportation projects. Two of the mixtures contained 10% RAP and 5% RAS, while the other two mixtures contained 25% RAP but no RAS. Illinois semicircular bending and Florida indirect tension tests were performed to assess mixture cracking and fracture properties. Results showed that mixtures containing 10% RAP and 5% RAS have relatively low fracture energy, creep compliance, energy ratio, and flexibility index but high resilient modulus. These results indicate that mixtures containing 10% RAP and 5% RAS are stiffer, more prone to cracking, and tend to absorb less fracture energy. Mixtures with 25% RAP and no RAS showed the opposite behavior.
9
Felker, Victoria. "Characterizing the roughness of Kansas PCC and Superpave pavements /." Search for this dissertation online, 2005. http://wwwlib.umi.com/cr/ksu/main.
Testo completo
10
Wacker, Brian J. "Evaluation of the rutting resistance of Nevada's superpave mixtures." abstract and full text PDF (free order & download UNR users only), 2006. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1436017.
Testo completo
11
Hornbeck, Nicholas C. "Effect of compaction effort on Superpave surface course materials." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5592.
Testo completoAbstract (sommario):
Thesis (M.S.)--West Virginia University, 2008.<br>Title from document title page. Document formatted into pages; contains viii, 73 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 52-54).
12
Rausch, David Michael Brown E. R. "Laboratory refinement of 4.75 mm Superpave designed asphalt mixtures." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Summer/Theses/RAUSCH_DAVID_35.pdf.
Testo completo
13
Knudsen, Christopher M. "Superpave : overview and implementation by the United States Navy." Thesis, Monterey, California. Naval Postgraduate School, 1999. http://hdl.handle.net/10945/9041.
Testo completoAbstract (sommario):
CIVINS<br>Superpave mix designs have been installed in this country for less than a decade, but have shown promising results thus far. The system provides for design with greater symmetry to the actual loading and aging of asphalt pavements. Although the new mix design utilizes the same materials as the old mix design, the resulting specification requirements are much tighter. While there have been some problems with the installation of the newly designed asphalt mixtures, these problems have been overcome by a good quality control program and close monitoring of the installation process. An asphalt pavement installed under the Superpave system carries with it a requirement for additional training of personnel that the agencies must provide. The United States Navy has a large Current Plant Value of asphalt pavements and could benefit greatly from technology that increases the life span of their facilities
14
Adamah, Cornelius. "Effect of compaction effort on SuperPave base course materials." Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10822.
Testo completoAbstract (sommario):
Thesis (M.S.)--West Virginia University, 2009.<br>Title from document title page. Document formatted into pages; contains viii, 79 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 52-54).
15
Aziz, Syeda Rubaiyat. "Evaluation of cracking resistance of Superpave mixtures in Kansas." Thesis, Kansas State University, 2013. http://hdl.handle.net/2097/16220.
Testo completoAbstract (sommario):
Master of Science<br>Department of Civil Engineering<br>Mustaque Hossain<br>Reclaimed Asphalt Pavement (RAP) is a useful alternative to virgin aggregates in hot-mix asphalt (HMA) as it reduces cost, conserves energy, and enables reuse of existing asphalt pavement. However, use of higher percentage of RAP sometimes leads to drier mixes that are often susceptible to early cracking. In this study, cracking resistance of Superpave mixtures with varying asphalt and RAP contents were investigated. HMA specimens were prepared based on Superpave mix design criteria for 12.5-mm (1/2-inch) nominal maximum aggregate size (NMAS). Specimens were compacted using the Superpave gyratory compactor. Static and repeated semi-circular bending (SCB) tests and Texas overlay tests (OT) (TEX-248-F) were performed in order to evaluate cracking resistance of Superpave mixtures containing three different asphalt contents (5.2%, 4.9%, and 4.6%) and three RAP percentages (20%, 30%, and 40%) from two distinct sources. Results from both crack tests showed that, with decreased asphalt content, cracking propensity increases. In general, higher percentage of RAP decreases cracking resistance. Statistical analysis of the results indicated a strong positive correlation between the asphalt film thickness and the number of load cycles before failure. Comparison of mean test results suggested that the Texas overlay test could do better evaluation of cracking resistance than the R-SCB test. This study was limited to mixtures with two sources of RAP. Because of such limitations and conflicting results from these RAP sources, a general conclusion regarding the minimum binder and maximum RAP contents without compromising cracking resistance could not be made. However, separate conclusions were drawn depending upon the characteristics of the RAP source.
16
Diazgranados, Delaskar David. "Evaluation of 4.75 mm Superpave mix criteria for West Virginia." Morgantown, W. Va. : [West Virginia University Libraries], 2003. http://etd.wvu.edu/templates/showETD.cfm?recnum=3122.
Testo completoAbstract (sommario):
Thesis (M.S.)--West Virginia University, 2003.<br>Title from document title page. Document formatted into pages; contains xiv, 146 p. : ill. (some col.), maps. Includes abstract. Includes bibliographical references (p. 107-109).
17
Sholar, Gregory A. "Evaluating the use of lower VMA requirements for superpave mixtures." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0008942.
Testo completo
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Adams, Thomas W. "Evaluation of quality control parameters for Superpave hot mix asphalt." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3838.
Testo completoAbstract (sommario):
Thesis (M.S.)--West Virginia University, 2005<br>Title from document title page. Document formatted into pages; contains vii, 61 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 51).
19
Villiers, Claude. "Sensitivity of superpave mixtures for development of performance-related specifications." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0007060.
Testo completo
20
Diefenderfer, Stacey D. "Investigation of Fatigue Properties of Superpave HMA at the Virginia Smart Road." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/29538.
Testo completoAbstract (sommario):
This study investigated the influence of material properties on fatigue life through laboratory fatigue testing of eleven Superpave hot mix asphalt (HMA) mixtures in use at the Virginia Smart Road. Mixtures were sampled from the plant and produced in the laboratory to investigate the influence of production method. Specimens were cut from the in-situ pavement and compacted in the laboratory to evaluate the influence of compaction method. Third point beam fatigue testing was performed at 25ºC and 10Hz. Additional testing at frequencies of 1 Hz and 5Hz, and at 10 Hz including rest periods of 0.4sec and 0.9sec were performed for one mixture to explore the impact of frequency and rest periods. Analyses were performed on the strain-life relationships and predicted endurance strain limits for the mixtures.
Investigation of strain-life relationships for several mixtures indicated that small differences in mixture volumetrics due to the production method have minimal impact on the laboratory fatigue performance of HMA. Comparisons of expected fatigue performance for one mixture indicated that shorter fatigue lives (under the same strain conditions) may be expected for laboratory-compacted specimens when compared to field-compacted specimens, despite visual observation of damage (surface cracking) in the field-compacted specimens. Testing performed on one mixture to determine the influence of different loading frequencies showed that fatigue life was independent of the requencies tested. Investigation of rest period inclusion indicated no differences in fatigue life for loading conducted at 10 Hz frequency and no rest period, 0.4sec rest period, or 0.9sec rest period. The evaluation of specimens cut from the in-situ pavement indicated that location within the lane and orientation did not significantly affect laboratory fatigue performance. The effect of aggregate size was considered; however, results were inconclusive. Using predictive strain-life fatigue equations, the benefits of polymer-modification of binders and use of SMA were shown for mixtures produced in the laboratory according to the job mix formula and to match the plant-produced volumetrics. Evaluation of the predicted fatigue strain endurance limit was performed using an energy-based and an empirical method. The energy method was shown to estimate significantly higher endurance limit strains for mixtures.<br>Ph. D.
21
Asiamah, Sylvester Ampadu. "Relationship between laboratory mix properties and rutting resistance for Superpave mixtures." [Gainesville, Fla.] : University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE1000103.
Testo completoAbstract (sommario):
Thesis (M.E.)--University of Florida, 2002.<br>Title from title page of source document. Document formatted into pages; contains xii, 110 p.; also contains graphics. Includes vita. Includes bibliographical references.
22
Tavakol, Masoumeh. "Minimum virgin binder limits in recycled Superpave (SR) mixes in Kansas." Thesis, Kansas State University, 2016. http://hdl.handle.net/2097/32681.
Testo completoAbstract (sommario):
Master of Science<br>Civil Engineering<br>Mustaque A. Hossain<br>Use of recycled materials in asphalt pavement has become widespread recently due to rising costs of virgin binder and increased attention to sustainability. Historically, recycled asphalt pavement (RAP) has been the most commonly used recycled material for hot-mix asphalt (HMA). However, recycled asphalt shingle (RAS), another recycled material, has recently become popular. Although there are some guidelines regarding use of RAP and RAS in HMA, their effects on mixture performance, especially on mixtures containing RAS, are not thoroughly understood.
In this research, three recycled Superpave mixture designs from the Kansas Department of Transportation (KDOT) with 9.5 mm (SR-9.5A) and 19 mm (SR-19A) Nominal Maximum Aggregate Size (NMAS) were selected as control mixtures. Mixtures containing higher percentages of recycled materials (RAP and RAS) were developed using KDOT blending charts. A total of nine mixtures with varying virgin binder contents were designed and assessed for moisture susceptibility, rutting resistance, and fatigue cracking propensity using modified Lottman, Hamburg Wheel Tracking Device, flow number, Dynamic Modulus, and S-VECD direct tension fatigue tests.
Results confirmed the effect of NMAS and material source on mixture performance. For SR-9.5A, the mixtures showed increased susceptibility to moisture and rutting damage below virgin binder content of 75%. For SR-19A, mixtures with virgin binder content of 70% showed satisfactory performance properties. Mixtures with virgin binder contents lower than 60% definitely showed inferior performance.
23
Ramírez, Ríos Liliana Patricia. "Superpara- and paramagnetic polymer colloids by miniemulsion processes." Phd thesis, Universität Potsdam, 2004. http://opus.kobv.de/ubp/volltexte/2005/137/.
Testo completoAbstract (sommario):
Polymerverkapselte magnetische Nanopartikel versprechen, in der Zukunft sehr erfolgreich bei Anwendungen in der Biologie und der Medizin eingesetzt werden zu können z. B. in der Krebstherapie und als Kontrastmittel bei der magnetischen Kernspinresonanztomographie. Diese Arbeit zeigt, dass durch die interdisziplinäre Kombination verschiedener Techniken Herstellungsverfahren und Eigenschaften solcher Partikel verbessert werden können. <br />
<br />
Unter Miniemulsionen versteht man wässrige Dispersionen relativ stabiler Öltröpfchen, zwischen 30 und 50 nm Größe. Ein Nanometer (nm) ist der 1.000.000.000ste Teil eines Meters. Ein Haar ist ungefähr 60.000 Nanometer breit.<br />
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Hergestellt werden Miniemulsionen durch Scherung eines Systems bestehend aus Öl, Wasser, Tensid (Seife) und einer weiteren Komponente, dem Hydrophob, das die Tröpfchen stabilisieren soll. Die Polymerisation von Miniemulsionen ermöglicht die Verkapselung anorganischer Materialen z. B. magnetischer Teilchen oder Gadolinium-haltiger Komponenten. Zu Optimierung des Verkapselung, ist es notwendig, die richtige Menge eines geeigneten Tensids zu finden. <br />
<br />
Die magnetischen polymerverkapselten Nanopartikel, die in einer wässrigen Trägerflüssigkeit dispergiert sind, zeigen in Abhängigkeit von Partikelgröße, Zusammensetzung, elektronischer Beschaffenheit, etc. ein sogenanntes superpara- oder paramagnetisches Verhalten. Superpara- oder paramagnetisches Verhalten bedeutet, dass die Flüssigkeiten in Anwesenheit äußerer Magnetfeldern ihre Fließfähigkeit beibehalten. Wenn das Magnetfeld entfernt wird, haben sie keine Erinnerung mehr daran, unter dem Einfluss eines Magnetfeldes gestanden zu haben, d. h., dass sie nach Abschalten des Magnetfeldes selbst nicht mehr magnetisch sind. <br />
<br />
Die Vorteile des Miniemulsionsverfahrens sind der hohe Gehalt und die homogene Verteilung magnetischer Teilchen in den einzelnen Nanopartikeln. Außerdem ermöglicht dieses Verfahren nanostrukturierte Kompositpartikel herzustellen, wie z. B polymerverkapselte Nanopartikel mit Nanoschichten bestehend aus magnetischen Molekülen.<br>Combining the magnetic properties of a given material with the tremendous advantages of colloids can exponentially increase the advantages of both systems. This thesis deals with the field of magnetic nanotechnology. Thus, the design and characterization of new magnetic colloids with fascinating properties compared with the bulk materials is presented. <br />
<br />
Ferrofluids are referred to either as water or organic stable dispersions of superparamagnetic nanoparticles which respond to the application of an external magnetic field but lose their magnetization in the absence of a magnetic field. <br />
<br />
In the first part of this thesis, a three-step synthesis for the fabrication of a novel water-based ferrofluid is presented. The encapsulation of high amounts of magnetite into polystyrene particles can efficiently be achieved by a new process including two miniemulsion processes. The ferrofluids consist of novel magnetite polystyrene nanoparticles dispersed in water which are obtained by three-step process including coprecipitation of magnetite, its hydrophobization and further surfactant coating to enable the redispersion in water and the posterior encapsulation into polystyrene by miniemulsion polymerization. It is a desire to take advantage of a potential thermodynamic control for the design of nanoparticles, and the concept of "nanoreactors" where the essential ingredients for the formation of the nanoparticles are already in the beginning. The formulation and application of polymer particles and hybrid particles composed of polymeric and magnetic material is of high interest for biomedical applications. Ferrofluids can for instance be used in medicine for cancer therapy and magnetic resonance imaging.<br />
<br />
Superparamagnetic or paramagnetic colloids containing iron or gadolinium are also used as magnetic resonance imaging contrast agent, for example as a important tool in the diagnosis of cancer, since they enhance the relaxation of the water of the neighbouring zones. New nanostructured composites by the thermal decomposition of iron pentacarbonyl in the monomer phase and thereafter the formation of paramagnetic nanocomposites by miniemulsion polymerization are discussed in the second part of this thesis. In order to obtain the confined paramagnetic nanocomposites a two-step process was used. In the first step, the thermal decomposition of the iron pentacarbonyl was obtained in the monomer phase using oleic acid as stabilizer. In the second step, this iron-containing monomer dispersion was used for making a miniemulsion polymerization thereof. <br />
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The addition of lanthanide complexes to ester-containing monomers such as butyl acrylate and subsequent polymerization leading to the spontaneous formation of highly organized layered nanocomposites is presented in the final part of this thesis. By an one-step miniemulsion process, the formation of a lamellar structure within the polymer nanoparticles is achieved. The magnetization and the NMR relaxation measurements have shown these new layered nanocomposites to be very apt for application as contrast agent in magnetic resonance imaging.
24
Ramírez, Ríos Liliana Patricia. "Superpara- and paramagnetic polymer colloids by miniemulsion processes." [S.l. : s.n.], 2004. http://pub.ub.uni-potsdam.de/2004/0026/ramirez.pdf.
Testo completo
25
Ferro, Claudia Cristina. "Efeito do teor e granulometria de borracha, do tempo e da temperatura de mistura e do tempo de armazenamento sobre propriedades do ligante asfalto-borracha." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/18/18137/tde-06012016-114843/.
Testo completoAbstract (sommario):
A produção de um ligante modificado com a borracha de pneus usados tem-se tornado viável em virtude do aumento da rigidez a temperaturas elevadas e da flexibilidade a baixas temperaturas que ele proporciona no revestimento dos pavimentos flexíveis, contribuindo para amenizar dois dos principais defeitos que afetam este tipo de pavimento, a saber, a deformação permanente nas trilhas de roda e as trincas por fadiga. Em acréscimo, consegue-se diminuir a quantidade de pneus dispostos em aterros sanitários, disponibilizando espaço e evitando problemas ambientais e de saúde pública, pois o acúmulo de pneus facilita a procriação de insetos e de outros vetores de doenças. Utilizando-se ensaios tradicionais e ensaios do método Superpave, neste trabalho são analisados os efeitos dos principais fatores que condicionam o comportamento do ligante asfalto-borracha (teor granulometria das partículas de borracha, tempo e temperatura de mistura, mantida constante em 155ºC) e as alterações nas propriedades físicas do ligante asfalto-borracha durante o tempo de armazenamento.<br>The production of a modified binder with used tire has become possible because of the increase in the stiffness at high temperature and the flexibility at low temperature that it brings to the surface layers of flexible pavements. The asphalt-rubber binders help to prevent two of the most important problems that affect flexible pavements, that is, the permanent deformation in the wheel tracks and fatigue cracking. In addition, it is possible to reduce the amount of tires disposed in sanitary landfills, increasing the service-life and avoiding environmental and health problems. Using traditional tests and tests of the Superpave method, this study analyses the effects of the main factors that affects the behavior of the asphalt-rubber binder (content and gradation of rubber particles, reaction temperature fixed in 155ºC and time) and the changes in the physical properties of asphalt-rubber binder during the storage time.
26
Karimi, Sahand Sasha. "Increasing durability of hot mix asphalt pavements designed with the superpave system." College Park, Md.: University of Maryland, 2009. http://hdl.handle.net/1903/9668.
Testo completoAbstract (sommario):
Thesis (M.S.) -- University of Maryland, College Park, 2009.<br>Thesis research directed by: Dept. of Civil and Environmental Engineering . Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
27
Donkor, Collins Boadu. "Evaluation of rut resistance of SuperPave fine-graded and coarse-graded mixtures." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0013324.
Testo completo
28
Kanneganti, Vasavi. "Comparison of 19mm Superpave and Marshall base II mixes in West Virginia." Morgantown, W. Va. : [West Virginia University Libraries], 2002. http://etd.wvu.edu/templates/showETD.cfm?recnum=2433.
Testo completoAbstract (sommario):
Thesis (M.S.)--West Virginia University, 2002.<br>Title from document title page. Document formatted into pages; contains ix, 70 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 43-45).
29
Grant, Thomas Paul. "Determination of asphalt mixture healing rate using the Superpave Indirect Tensile Test." [Gainesville, Fla.] : University of Florida, 2001. http://purl.fcla.edu/fcla/etd/UFE0000321.
Testo completoAbstract (sommario):
Thesis (M.E.)--University of Florida, 2001.<br>Title from title page of source document. Document formatted into pages; contains xii, 82 p.; also contains graphics. Includes vita. Includes bibliographical references.
30
Patino, Gabriel E. "Evaluation of Superpave mixtures in West Virginia using the asphalt pavement analyzer." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3853.
Testo completoAbstract (sommario):
Thesis (M.S.)--West Virginia University, 2005.<br>Title from document title page. Document formatted into pages; contains x, 121 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 93-99).
31
Nelson, Jason W. "Comparison of 9.5 Superpave and Marshall Wearing I mixes in West Virginia." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3879.
Testo completoAbstract (sommario):
Thesis (M.S.)--West Virginia University, 2005.<br>Title from document title page. Document formatted into pages; contains vi, 82 p. : ill. Includes abstract. Includes bibliographical references (p. 62-63).
32
Gouveia, Lilian Taís de. "Avaliação do ensaio de angularidade do agregado fino (FAA) da especificação Superpave." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/18/18137/tde-15032004-154355/.
Testo completoAbstract (sommario):
O desempenho dos pavimentos de concreto asfáltico depende das propriedades e proporções relativas dos seus principais componentes, ou seja, dos agregados minerais, do cimento asfáltico e do volume de vazios. O desempenho das misturas asfálticas de graduação densa é predominantemente influenciado pelas características de forma, angularidade e textura superficial dos agregados finos, que condicionam a estabilidade das misturas. O ensaio de Angularidade do Agregado Fino (FAA), adotado pelo Superpave para avaliar e quantificar a forma, a angularidade e a textura superficial das partículas, tem levantado muitas dúvidas quanto à sua adequabilidade. O objetivo deste trabalho é verificar se o ensaio FAA é capaz de classificar os agregados finos, identificando materiais com melhores condições para utilização em misturas asfálticas. Para tanto, são realizados, além de ensaios de angularidade do agregado fino, análise visual da forma, angularidade e textura superficial, ensaios de cisalhamento direto em amostras de agregado fino e ensaios Marshall em amostras de misturas asfálticas produzidas com diferentes agregados finos. Os resultados obtidos nas análises visuais indicam que o ensaio FAA não é capaz de separar os efeitos de angularidade e de forma das partículas. Os resultados dos ensaios de cisalhamento direto demonstram que um agregado fino com maior FAA não apresenta, necessariamente, uma maior resistência ao cisalhamento. Os resultados do ensaio Marshall também não demonstram correlação da estabilidade com os valores de FAA. Todos os resultados obtidos revelam que o ensaio FAA não é capaz de classificar adequadamente os agregados finos e, desta forma, não é capaz de identificar agregados que proporcionam misturas asfálticas com melhor desempenho<br>The performance of hot-mix asphalt (HMA) pavements depends on the properties and proportions of the major components, i.e., mineral aggregates, asphalt cement and air voids. The performance of dense asphalt mixtures is influenced mainly by fine aggregate characteristics, such as shape, angularity and surface texture. The Fine Aggregate Angularity test (FAA), adopted by Superpave to evaluate and quantify the shape, angularity and surface texture of fine aggregate particles, has lead a lot of doubts regarding its suitability. The objective of this work is to verify if the FAA test is really able to classify fine aggregates and identify the good ones to be used in asphalt mixtures. Thus, FAA test, visual analysis of shape, angularity and surface texture, direct shear test with samples of fine aggregates and Marshall test with samples of asphalt mixtures produced with different fine aggregates are performed. The results obtained in the visual analyses indicate that the FAA test is not able to separate the effects of angularity from the effects of shape. The results of the direct shear test demonstrate that a fine aggregate with a higher FAA doesn't present, necessarily, a larger shear strength. The values of the Marshall test doesn't demonstrate correlation between Marshall stability and FAA values. All the results show that the FAA test is not able to classify fine aggregates appropriately and, therefore, is unable to identify aggregates that provide mixtures with better performance
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Biensch, Bill Oscar. "The impact that Superpave aggregate specifications will have on the Calgary asphalt industry." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0015/MQ55179.pdf.
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Dantas, Gustavo Henrique Santana. "Estudo do emprego do Compactador Giratório Superpave na compactação de um solo argiloso." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/18/18143/tde-09042013-142246/.
Testo completoAbstract (sommario):
Esta pesquisa apresenta um estudo acerca da viabilidade do uso do Compactador Giratório Superpave (CGS) no ensaio de compactação de solos e mostra também um paralelo entre o ensaio de compactação Proctor e o ensaio de compactação no CGS. Para isso, foi selecionado um solo argiloso para ser submetido a ensaios de compactação Proctor e a ensaios de compactação com uso do compactador giratório. Nos ensaios com CGS foram utilizadas três tensões normais (200, 400 e 600 kPa) e corpos de prova de 1000g e 1800g. Também foi avaliado o comportamento mecânico de corpos de prova, moldados estaticamente e por amassamento, por meio dos ensaios de compressão simples, resistência a tração por compressão diametral e triaxial cíclico. No final, foi sugerido um procedimento de compactação de solos no CGS. Nos ensaios com o CGS, verificou-se que os valores de massa específica aparente seca (MEAS) (a) foram muito menores para os ensaios com 200 kPa que aqueles apresentados nas tensões de 400 kPa e 600 kPa; (b) apresentaram diferenças muito pequenas entre os ensaios de 400 e 600 kPa; (c) foram maiores para os CPs de 1000g que para os CPs de 1800g e (d) não tiveram ganho expressivo após 75 giros. A comparação entre as curvas de compactação Proctor e do CGS mostrou que os ensaios no CGS com tensão normal de 400 kPa e 600 kPa atingiram a massa específica seca máxima (MEAS máx) do Proctor Intermediário, mas não a do Proctor Modificado. Quanto aos ensaios mecânicos, os corpos de prova moldados no CGS apresentaram, de maneira geral, melhores resultados de resistência à compressão simples e resistência a tração por compressão diametral, enquanto que para o MR, observou-se uma tendência de melhor desempenho dos CPs moldados estaticamente.<br>This research presents the feasibility for using the Superpave Giratory Compactor (SGC) in soils compaction and a comparative evaluation between Proctor\'s and SGC\'s compaction processes. In order to evaluate the SGC compactor, a clayey soil was submitted SGC compaction tests at three normal stress (200, 400 and 600 kPa) and two different weight specimens (1000 and 1800 g). Mechanical tests to determinate the compression and tensile strength and resilient modulus were done on specimens compacted statically and by kneading. Additionally, it is suggested a compaction protocol test on SGC. About SGC\'s result tests indicated that dry densities values (a) at 200 kPa were lower than those obtained at 400 and 600 kPa; (b) at 400 and 600 kPa did not exhibit important variations (c) of 1000g specimens were higher than the 1800g ones and (d) did not increases after 75 number of gyrations. Regarding to mechanical properties, it can be detected that, in general, compression and tensile strength of SGC\'s specimens were better than the specimens compacted statically ones, and, as resilient modulus, specimens compacted statically had better perform than SGC\'s specimens
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Ahmed, Ananna. "Evaluation of cracking potential of superpave mixtures with high reclaimed asphalt pavement content." Thesis, Kansas State University, 2015. http://hdl.handle.net/2097/20411.
Testo completoAbstract (sommario):
Master of Science<br>Civil Engineering<br>Mustaque A. Hossain<br>Approximately 89% of 11,000 miles of Kansas roads are surfaced with asphalt. Hundreds of thousands of tons of reclaimed asphalt pavement (RAP) are produced annually in the United States, including in Kansas. This bulk volume of RAP must be economically managed in order to achieve environmental friendliness. Recycling of RAP conserves natural resources and reduces landfill usage. However, many agencies have reported that increased RAP content produces drier hot-mix asphalt (HMA) mixtures than virgin mixtures that are susceptible to premature cracking.
In this research, laboratory-produced Superpave HMA mixtures containing increased percentages (20, 30, and 40%) of RAP materials from three RAP sources (Shilling Construction Co., Konza Co., and the Kansas Department of Transportation’s project, US 73) were studied for cracking performance. Mix designs were produced using Superpave design criteria for 12.5-mm nominal maximum aggregate size mixture. The static and repetitive Semicircular Bending (SCB) test, the Texas Overlay Tester test, the dynamic modulus test, and Viscoelastic Continuum Damage (VECD) tests were performed on laboratory-prepared samples. In general, cracking performance decreased with increased RAP content. The RAP from the US 73 project performed most consistently compared to other two sources of RAPs. Test results were analyzed using two-way Analysis of Variance (ANOVA), proving that mixtures containing 4.5% to 4.9% binder performed the best against cracking. The RAP source was found to have more effect on cracking propensity than RAP content. Mixtures with RAP content up to 40% performed satisfactorily. Tukey’s pairwise comparison method was used to compare results from all tests; VECD was determined to be the most appropriate test to evaluate cracking propensity of HMA mixtures.
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Simões, Felipe de Andrade. "Análise do comportamento mecânico em fluência de misturas asfálticas dosadas pela metodologia Superpave." Universidade Federal de Viçosa, 2018. http://www.locus.ufv.br/handle/123456789/19988.
Testo completoAbstract (sommario):
Submitted by Marco Antônio de Ramos Chagas (mchagas@ufv.br) on 2018-06-06T18:25:07Z
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Previous issue date: 2018-02-28<br>Esta dissertação apresenta um estudo sobre o comportamento de misturas asfálticas a quente em relação à deformação permanente, à luz dos ensaios de Creep estático e dos parâmetros oriundos da curva de compactação. Para isso, utilizaram-se, para composição dessas misturas, agregados comumente empregados na cidade de Viçosa-MG e dois tipos de ligante asfáltico (CAP 50/70 e BETUFLEX 60/85). Essas misturas foram dosadas pela metodologia Superpave e compactadas no teor e número de giros de projeto. Verificou-se que, para a condição de projeto, as misturas asfálticas que utilizaram o ligante asfáltico CAP 50/70 apresentaram melhor trabalhabilidade e deformações inferiores às misturas compostas pelo ligante polimérico BETUFLEX 60/85. Adicionalmente, esta pesquisa estudou a influência do teor de ligante no comportamento das misturas asfálticas em relação à deformação permanente. Constatou-se que misturas asfálticas com maior teor de ligante tendem a apresentar maiores deformações permanentes e melhor trabalhabilidade. Ademais, buscou-se relacionar os índices da curva de compactação (Construction Densification Index, CDI; Traffic Densification Index modificado, TDIm; e Locking Point, LP) com os parâmetros obtidos nos ensaios de creep estático (Deformação total após o período de recuperação, Dt ; Módulo de Fluência, MF; e Inclinação da Curva, Icurva) através das curvas obtidas por meio da correlação entre esses índices. As correlações verificadas apresentaram bons resultados de R2, mostrando que, para as particularidades desta pesquisa, os índices de compactação podem ser usados como indicadores de previsão quanto ao comportamento mecânico em relação à resistência às deformações permanentes das misturas asfálticas estudadas.<br>This dissertation presents a study about a behavior of hot asphalt mixtures in relation of permanent deformation, insight of Static Creep Tests and parameters derived from compaction curve. For the composition of these mixtures, aggregates commonly used in Viçosa-MG and two types of asphalt binder. These mixtures were dosed by Superpave method and compacted in the content and number of gyrations. It was found, for the project condition, the mixtures containing the asphalt binder CAP 50/70 showed better workability and lower deformation than the blends composed by BETUFLEX 60/85. In addition, this research studied the influence of binder content on asphaltic mixtures about permanent deformation comportment. It was observed that asphaltic mixtures with high binder content tend to present higher permanent deformation and better workability. Moreover, this research attempted to relate the compaction curve parameters (CDI, Construction Densification Index; TDIm, Modified TDI; and Locking Point, LP) with parameters obtained on Static Creep Tests (Total deformation after recuperation period, Dt; Creep modulus, MF; and Curve slope, Icurva) through the curve generated by correlation between these indices. These correlations presents great R2 results compaction indices can be used as a predictive indicator about the mechanic behavior for resistance to permanent deformations of the studied asphaltic mixtures.
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Phillips, Joseph A. "Formulation of free higher spin supersymmetric theories in superpsace." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/1997.
Testo completoAbstract (sommario):
Thesis (Ph. D.) -- University of Maryland, College Park, 2004.<br>Thesis research directed by: Physics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Oda, Sandra. "Análise da viabilidade técnica da utilização do ligante asfalto-borracha em obras de pavimentação." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/18/18137/tde-30012018-151928/.
Testo completoAbstract (sommario):
Este trabalho apresenta estudo sobre a viabilidade técnica da incorporação de borracha de pneus em ligantes asfálticos utilizados em obras de pavimentação. Trata-se de uma alternativa para solucionar um grave problema ambiental, pois no Brasil, anualmente, são descartados mais de 30 milhões de pneus, dos quais a maior parte é disposta em locais inadequados, servindo para a procriação de vetores de doenças e representando risco de contaminação do meio-ambiente. Os efeitos dos principais fatores que condicionam o comportamento do ligante asfalto-borracha (teor e granulometria da borracha, temperatura de mistura, tempo de reação) são avaliados através de ensaios tradicionais de caracterização de ligantes asfálticos e também ensaios do Método Superpave, que determinam propriedades fundamentais, diretamente relacionadas ao desempenho dos pavimentos no campo. Os resultados da análise estatística da programação fatorial de ensaios laboratoriais desenvolvida evidenciam o efeito preponderante do teor de borracha e, principalmente, que o ligante asfalto-borracha pode aumentar a resistência ao acúmulo de deformação permanente e ao aparecimento de trincas por fadiga do revestimento.<br>This work presents the results of a study about the technical feasibility of the use of asphalt-rubber binder by the asphalt paving industry. In Brazil, more than 30 million tires a year are disposed, mostly in inadequate sites, causing serious health and environmental problems. The effects of the main factors (rubber content, rubber particle size, temperature of mixture, reaction time) on the behavior of asphalt-rubber binders are evaluated by traditional tests and also by tests of the Superpave Method, which are based on fundamental properties, directly related to field performance. The results of the statistical analysis of the factorial design of laboratory experiments show the most significant effect of rubber content and, mainly, that asphalt-rubber binder can increase the resistance to permanent deformation and fatigue cracking.
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Rushing, John Ford. "DEVELOPMENT OF CRITERIA FOR USING THE SUPERPAVE GYRATORY COMPACTOR TO DESIGN AIRPORT PAVEMENT MIXTURES." MSSTATE, 2009. http://sun.library.msstate.edu/ETD-db/theses/available/etd-07082009-131453/.
Testo completoAbstract (sommario):
Asphalt concrete pavements on commercial airports in the United States are constructed according to the Federal Aviation Administration Advisory Circular 150/5370-10B, Item P-401, Plant Mix Bituminous Pavements. This specification does not provide guidance for using the Superpave gyratory compactor in the design of asphalt mixtures. This thesis describes a laboratory study of hot mix asphalt (HMA) mix design for airport pavements that uses the Superpave gyratory compactor. These recommendations are based on comparisons of volumetric property measurements of HMA mixtures compacted using Marshall compaction and Superpave gyratory compaction.
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Tam, Weng On. "Development and use of static creep test to evaluate rut resistance of superpave mixes /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.
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Padula, Martin. "Automation of the Superpave mix design process for the West Virginia Division of Highways." Morgantown, W. Va. : [West Virginia University Libraries], 2002. http://etd.wvu.edu/templates/showETD.cfm?recnum=2678.
Testo completoAbstract (sommario):
Thesis (M.S.)--West Virginia University, 2002.<br>Title from document title page. Document formatted into pages; contains ix, 145 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 63-65).
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Bardini, Vivian Silveira dos Santos. "Estudo de viabilidade técnica da utilização de cinzas da queima da casca de Pinus em obras de pavimentação asfáltica." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/18/18143/tde-03022009-095000/.
Testo completoAbstract (sommario):
O processo industrial para fabricação de MDF - Medium Density Fiberboard - utiliza como combustível a casca de madeira Pinus, cuja queima gera um resíduo cinzas de granulometria fina, que constitui um problema ambiental por conter algumas substâncias em quantidade acima da permitida pela NBR 10004:2004, que o classifica como resíduo de classe II A - não inerte. O objetivo geral desta pesquisa é testar a hipótese de que o resíduo cinzas podem ser utilizadas como fíler em misturas asfálticas, mediante a verificação das propriedades de interesse à engenharia através de ensaios de laboratório: resistência à tração por compressão diametral, módulo de resiliência, vida de fadiga, dano por umidade induzida, estabilidade e fluência Marshall. Foram realizados ensaios para determinação da massa específica das cinzas - resíduo, inclusive com picnometria de gás hélio. Primeiramente, o fíler mineral foi substituído em massa pelo resíduo, optando-se, em função dos resultados preliminares, pela equivalência em volume. As dosagens Marshall, para as misturas contendo resíduo, resultaram em um teor ótimo de ligante praticamente constante, independentemente do teor utilizado (3,5% e 6,0%). Quanto às propriedades mecânicas, nos ensaios de resistência à tração, os maiores valores foram verificados para as misturas contendo 3,5% de fíler mineral, enquanto as misturas contendo cinzas - resíduo - apresentaram os menores valores. Os maiores valores de módulo de resiliência foram das misturas contendo maiores teores de fíler, sendo que o fíler mineral resultou em maior módulo de resiliência do que o resíduo. Na avaliação do dano por umidade induzida, apenas as misturas contendo 6,0% de fíler mineral se mostraram não susceptíveis, enquanto que as misturas contendo resíduo foram as que apresentaram maior susceptibilidade. O resíduo também diminuiu a vida de fadiga, sendo a diferença para as misturas com fíler mineral mais acentuada para o menor teor de fíler. Apesar dos resultados indicarem uma piora de características com a utilização do resíduo, os valores obtidos ainda se situam, na maioria dos casos, acima dos limites mínimos estabelecidos pelas normas técnicas, encorajando pesquisas adicionais, principalmente em função do problema ambiental representado pelas cinzas da queima da casca de Pinus.<br>The industrial production of MDF - Medium Density Fiberboard - uses Pinus wood skin as a fuel, which, after the burning process, generates a fine gradation residue, an ash that is an environmental problem due to the content of some substances, above the quantity allowed by the NRB 10004:2004, and it is classified as a class II-A - non-inert product. The general purpose of this work is to test the hypothesis that the residue can be use as a filler in hot-mix asphalt, through the evaluation of technological properties by laboratory tests such as indirect tension, resilient modulus, fatigue life, moisture susceptibility, Marshall stability and creep. The evaluation of specific gravity of the residue was done by the gas pycnometer method. Initially, the substitution of the mineral filler by the residue was done in terms of weight, but the preliminary results showed that the best option was the substitution in terms of volume. The Marshall mix design for mixtures containing the residue resulted in a binder content approximately constant for both residue contents considered in this work (3.5% and 6.0%). The indirect tension test results showed higher values for mixtures containing 3.5% of mineral filler, being the lowest values associated to mixtures that use residue. The higher the filler content, the higher the resilient modulus and mixtures with mineral filler presented higher resilient modulus values. Only the mixture with 6.0% of mineral filler passed the moisture susceptibility test, and mixtures with residue presented higher moisture susceptibility. The residue also weakened the fatigue life, being the difference higher for mixtures with lower filler content. Although the results show a worsening of asphalt mixtures properties due to the use of the residue as a filler, for most of the obtained results the value remained above the minimum acceptable by technical standards, encouraging further researches on this subject, mainly due to the environmental problem associated to the burning of Pinus wood skin.
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Manandhar, Chandra Bahadur. "Rapid estimation of lives of deficient superpave mixes and laboratory-based accelerated mix testing models." Diss., Manhattan, Kan. : Kansas State University, 2010. http://hdl.handle.net/2097/3868.
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Asam, Kalyan Reddy. "Laboratory evaluation of the effect of superpave gradations and polymer modified asphalts on pavement performance." Ohio : Ohio University, 2001. http://www.ohiolink.edu/etd/view.cgi?ohiou1173466416.
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Gebremeskel, Kiflat Yohannes. "The effect of filler type and shape on HMA energy dissipation performance." Thesis, KTH, Väg- och banteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-127706.
Testo completoAbstract (sommario):
Hot mix asphalt pavements require adequate compaction to achieve the required density to resist rutting. The amount of energy required to achieve the optimum degree of compaction depends on the type of gradation, bitumen content, filler type and shape, type of compaction equipment etc. In this study, the net energy required to reduce the specimen volume (size) after each gyration of the superpave gyratory compactor is used as the compaction energy index (CEI) to measure the compactability of the samples. Samples with different filler types and content are used for the analysis. Effect of fillers on the viscosity of the mastic has been studied previously. Viscosity of mastics in return affects the compactability of the mix in general. In this regard this paper tries to study the effect of fillers on the compaction of hot mix asphalt with the help of the superpave gyratory compactor. Moreover, resistance of the asphalt mix samples against rutting is evaluated using the simple performance test. In this test, the sample is subjected to a hydraulic loading while strain transducers attached to the sample measure the displacement. A computer program receives the displacement data at various frequencies and calculates the dynamic modulus and flow number which are used for the evaluation of the pavement performance. :
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Leiva, Villacorta Fabricio. "Relationships between laboratory measured characteristics of HMA and field compactability." Auburn, Ala., 2007. http://repo.lib.auburn.edu/07M%20Theses/LEIVA_FABRICIO_7.pdf.
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Hage, Robert Becerra El. "Estudo de misturas asfálticas tipo Stone Matrix Asphalt (SMA) à luz dos compactadores Marshall e Superpave." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/18/18143/tde-05092012-163002/.
Testo completoAbstract (sommario):
Este trabalho teve como objetivo principal investigar, do ponto de vista volumétrico, qual seria o número de giros necessário, no Compactador Giratório Superpave (CGS), para produzir corpos de prova com características similares aos produzidos com a energia 50 golpes no compactador Marshall, para misturas tipo Stone Matrix Asphalt (SMA) com volume de vazios igual a 4%. Como complemento, realizaram-se dosagens no CGS com 100 giros, visando avaliar o impacto do aumento da energia de compactação no teor de projeto, também para volume de vazios igual a 4%, em comparação aos CPs compactados com o número de giros equivalente à Marshall determinada anteriormente. Foram utilizadas duas faixas granulométricas de misturas SMA: a com Tamanho Máximo Nominal (TMN) 7,93 mm do DER-SP e a com TMN 12,5 mm da AASHTO. Para todas as misturas foram avaliadas as propriedades mecânicas de corpos de prova com 4% de volume de vazios. Dos resultados dos ensaios concluiu-se que o número de giros no CGS para produzir misturas com volume de vazios igual a 4% nos teores de asfalto de trabalho Marshall são similares para as duas faixas granulométricas utilizadas. Por outro lado, a dosagem com 100 giros no CGS reduziu significativamente o teor de asfalto de trabalho para as duas faixas estudadas em comparação com os teores de trabalho obtidos das dosagens Marshall e no CGS com os números de giros equivalentes. Com relação às propriedades mecânicas, as resistências à tração e os módulos de resiliência dos corpos de prova produzidos com 100 giros no CGS são, de uma maneira geral, um pouco menores que os valores obtidos nos corpos de prova compactados no compactador Marshall, independente da faixa granulométrica, porém maiores que os valores obtidos para a compactação giratória nas energias equivalentes. A vida de fadiga para a faixa mais fina é significativamente maior para os corpos de prova compactados com 100 giros em comparação com a compactação Marshall e para a faixa mais grossa manteve-se na mesma ordem de grandeza da obtida para a compactação Marshall. Para as misturas ensaiadas, não foi constatado influência da compactação no dano causado pela umidade induzida<br>The aim of the work was to investigate, in terms of volumes properties, which would be the number of gyrations required in the Superpave Gyrations Compactor (SGC), to produce samples with characteristics similar to the energy produced with 50 blows in the Marshall Compactor, for Stone Matrix Asphalt (SMA) mixtures with voids content equal to 4%. As a complement, samples designed in the SGC with 100 gyrations, were made to evaluate the impact of increased compaction energy in the binder content, also for voids content equal to 4%, compared to the samples compacted with a number of gyrations equivalent to Marshall, as previously determined. It was used two different aggregates gradations for SMA mixtures: Nominal Maximum Size (NMS) 7,93 mm of the DER and the NMS 12,5 mm of the AASHTO. The mechanical properties of all samples were evaluated with voids content of 4%. The number of gyrations in the SGC to produce mixtures containing voids content equal to 4% for the Marshall`s binder content are similar for both aggregates gradations used. On the other hand, the SMA mixture design with 100 gyrations reduced the binder content for both gradations in comparison with the binder content obtained from Marshall Compaction and SGC with the equivalent number of gyrations. Concerning mechanical properties, the tensile strength and resilient modulus of the samples produced with 100 gyrations in the SGC are, generally, slightly lower than the values obtained with the samples compacted in the Marshall compactor, independent of the aggregate gradations, but higher than the values obtained with the samples compacted with a equivalent energy in the SGC. The fatigue life for the fine gradation (NMS=7,93mm) is significantly higher for the samples compacted in the SGC with 100 gyrations compared with the Marshall compaction, and for the coarse gradation (NMS=12,5 mm) remained in the same order of magnitude that of the Marshall compaction. It was not observed any influence of the compaction method in the induced damage caused by moisture
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Vasconcelos, Kamilla Lima. "Comportamento mecânico de misturas asfálticas a quente dosadas pelas metodologias marshall e superpave com diferentes granulometrias." reponame:Repositório Institucional da UFC, 2004. http://www.repositorio.ufc.br/handle/riufc/4902.
Testo completoAbstract (sommario):
VASCONCELOS, K. L. Comportamento mecânico de misturas asfálticas a quente dosadas pelas
metodologias marshall e superpave com diferentes granulometrias. 2004. 132 f. Dissertação (Mestrado em Engenharia de Transportes) – Centro de Tecnologia, Universidade Federal do Ceará, Fortaleza, 2004.<br>Submitted by Zacarias Barbosa Matias Junior (zaca@det.ufc.br) on 2013-05-20T19:34:35Z
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Previous issue date: 2004-12<br>The use of new asphalt mixtures and a new design process are still in consolidation at the universities and departments of transportation in Brazil. The main objective of this research is to design hot mix asphalts with different aggregate gradations using both the Marshall and Superpave (level 1) design method. The differences between these two design methodsare: (i) theoretical maximum specific gravity (Gmm) determination; (ii) compaction method; and (iii) short-term aging of the mixtures. It was selected to this research dense mixtures with 4%air voids, but with continuous and gap-graded gradations. The Gmm was determined indirectly from the mixture composition and the relative densities of the constituents of the mixes, and through the uses of a vacuum pump (Rice method). Short-term aging was considered just in the Superpave design, with 2 hours inthe oven at the compaction temperature. The design results showed higher optimum asphalt content for the Superpave mixtures. The mechanical behavior of the mixtures was evaluated by: the indirect tensile strenght,
resilient modulus, fatigue life (stress controlled), resistance to moisture damage, and permanent deformation.<br>O conhecimento dentro das universidades brasileiras, e principalmente dos órgãos rodoviários, sobre novos tipos de misturas asfálticas e novas formas de dosagens, vem sendo consolidado, mas ainda precisa ser transformado em metodologias correntes. O objetivo geral dessa pesquisa foi a realização da dosagem de misturas asfálticas usinadas a quente com diferentes granulometrias através das metodologias
Marshall e Superpave (Nível I).Os procedimentos de dosagem selecionados apresentam como maiores diferenças: (i) forma de determinação da densidade máxima teórica
(DMT); (ii) forma de compactação; e (iii) envelhecimento de curto prazo das misturas.
As misturas selecionadas foram todas densas, com volume de vazios em torno de 4%,
variando-se as distribuições granulométricas, sendo abordadas três granulometrias contínuas (CBUQs) e duas descontínuas (SMAs). A determinação da DMT foi realizada através da ponderação das densidades reais dos materiais constituintes, e através da aplicação de vácuo. O envelhecimento de curto prazo foi considerado apenas na dosagem Superpave, onde foi adotado um tempo de 2h das misturas em estufa na temperatura de compactação. Os resultados dos teores de projeto obtidos apontaram para um maior teor quando adotada a metodologia Superpave. A caracterização
mecânica das misturas foi realizada através dosensaios de resistência à tração estática
por compressão diametral (RT), módulo de resiliência (MR), vida de fadiga por
compressão diametral a tensão controlada e resistência à tração retida por umidade
induzida (RRT) e deformação permanente.
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Hadouaj, Hichem. "Ondes solitaires sur un film mince elastique superpose a un substrat non lineaire." Paris 6, 1991. http://www.theses.fr/1991PA066149.
Testo completoAbstract (sommario):
On demontre l'existence d'ondes solitaires acoustiques de surface se propageant sous la forme de solitons enveloppes obscurs ou brillants sur une structure composee d'un substrat non lineaire superpose d'une interface thermodynamique (un film tres mince) elastique supposee mathematiquement d'epaisseur nulle. L'analyse mathematique commencant avec la theorie des interfaces materielles est developpee par l'utilisation de la technique de whitham-newell du traitement des ondes non lineaires, dispersives, de petites amplitudes et presque monochromatiques. On montre que tout le probleme est gouverne par une seule equation de schrodinger non lineaire a l'interface, fournissant donc des solutions qui sont les analogues mecaniques des solitons optiques obscurs connus pour se propager dans les fibres optiques non lineaires. La simulation numerique est effectuee pour l'equation de schrodinger et le probleme bidimensionnel defini par le systeme initial d'equations non lineaires et dispersives. On montre ainsi la nature solitonique du phenomene. Par la suite, on montre analytiquement comment tout le probleme peut etre decrit par le systeme universel de zakharov lorsqu'on tient compte de l'existence du mode de rayleigh en plus de l'onde predominante de cisaillement (sh). On fait l'analyse de l'evolution d'un etat d'un seul soliton sous l'action d'une faible dissipation, et nous terminons par l'etude des collisions soliton-soliton symetriques dans le systeme d'une equation non lineaire de schrodinger et de deux equations de d'alembert avec le couplage de zakharov
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Fernández, Villalba Omar A., and Salinas Edgardo G. Cáceres. "Evaluación del comportamiento mecánico de mezclas SMA y Superpave empleando asfalto modificado con Polímero SBS (Estireno-Butadieno-Estireno)." Bachelor's thesis, Universidad Ricardo Palma. Programa Cybertesis PERÚ, 2007. http://cybertesis.urp.edu.pe/urp/2007/fernandez_oa/html/index-frames.html.
Testo completo