Rutting
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Modification of thermal and rheological behavior of asphalt binder by the addition of an ethylene-methyl acrylate-glycidyl methacrylate terpolymer and polyphosphoric acid
Abstract This study evaluated the modification effects of adding ethylene-methyl acrylate-glycidyl methacrylate terpolymer (EMGMA) in the presence of polyphosphoric acid (PPA) to an asphalt binder graded as 50/70 (0.1mm) in the Brazilian penetration grade specification (AC 50/70). The EMGMA terpolymer has been presented as a new alternative to modify asphalt
Polímeros. Publicado em: 2017-12
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2. Rutting analysis of 100 mm diameter polypropylene modified asphalt specimens using gyratory and Marshall compactors
Compaction technique used in Marshall design does not model the process of actual rolling procedures on site exactly. Carrying out laboratory compaction of dense bituminous mixtures with Superpave gyratory compactors is a more realistic way of simulating actual compaction. In this study, mechanical differences of reference and polypropylene modified asphalt
Mat. Res.. Publicado em: 08/02/2013
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3. Rutting prediction of asphalt mixtures modified by polypropylene fibers via repeated creep testing by utilising genetic programming
A novel application of genetic programming (GP) for modelling and presenting closed form solutions to the rutting prediction for polypropylene (PP) modified asphalt mixtures is investigated. Various PP fibers have been utilised for bitumen modification and repeated creep (RC) tests have been carried out. Marshall specimens, fabricated with multifilament 3 mm
Mat. Res.. Publicado em: 01/02/2013
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4. Contribuição para calibração de curva de evolução de afundamentos em trilha de roda de revestimentos asfálticos com utilização de resultados obtidos de simulador de tráfego em escala real. / A contribution to the calibration of performance curves for the prediction of permanent deformation in asphalt pavements using the results obtained from a large scale mobile traffic simulator
Permanent deformation, or rutting, is a critical type of pavement distress given that it is directly associated with transportation costs, due to a reduction of the ride quality, and user safety, due to poor driving conditions or water build-up during rainy periods that affect the tire-pavement interaction. In the case of pavements of highways belonging to c
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/03/2012
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5. Utilising neural networks and closed form solutions to determine static creep behaviour and optimal polypropylene amount in bituminous mixtures
The testing procedure in order to determine the precise mechanical testing results in Marshall design is very time consuming. Also, the physical properties of the asphalt samples are obtained by further calculations. Therefore if the researchers can obtain the stability and flow values of a standard mixture with the help of mechanical testing, the rest of th
Mat. Res.. Publicado em: 25/09/2012
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6. Evaluating permanent deformation of asphalt mixtures: field performance and laboratory data. / Estudo de deformação permanente em trilha de roda de misturas asfálticas em pista e em laboratório.
Dentre os diversos tipos de defeitos estruturais a que um pavimento está sujeito, a deformação permanente em trilha de roda da camada de rolamento é um dos mais importantes, pois além de propiciar uma degradação acelerada da estrutura do pavimento, ele reduz consideravelmente a segurança do usuário. Este trabalho pesquisa os processos que levam à d
Publicado em: 2010
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7. Comparison between the field performance of CAP 30-45 and CAP 50-70 for pavement layers. / Comparação do comportamento em campo de concretos asfálticos com CAP 30-45 e com CAP 50-70 para revestimentos de pavimentos.
In the last years, the volume of commercial heavy vehycles that transit through Brazilian highways is increasing. In addition, pavement wearing courses are exposed to the influence of high temperatures, that cause precocious asphalt layer distresses Therefore, asphalt mixture alternatives to the high traffic higwayshave been studied. One of the possibilities
Publicado em: 2008
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8. Estudo em laboratório e em campo de misturas asfálticas SMA 0/8S. / Study in laboratory and field of asphalt mixtures SMA 0/8S.
Esta pesquisa foi baseada em um projeto de Stone Matrix Asphalt - SMA na faixa 0/8S com asfalto CAP 20, feito para a execução de revestimento delgado em trecho experimental na Rodovia Presidente Dutra, ligando São Paulo ao Rio de Janeiro. A ocorrência de alguns defeitos neste trecho experimental motivou o estudo de misturas SMA 0/8S alternativas empregan
Publicado em: 2005
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9. Studies on the poll glands of the one-humped camel in relation to reproductive activity. I. Seasonal morphological and histochemical changes.
The poll glands of the camel have been studied histologically and histochemically. An active gland, as observed between September and March, with a peak period in November and December, consists of sharply demarcated lobules separated by thin strands of connective tissue. Alveoli and proximal parts of excretory ducts are either lined with flat/simple cuboida
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10. Morphology of the testis of the one-humped camel in relation to reproductive activity.
Histological and morphometric studies on the camel testis have been carried out systematically at regular monthly intervals during a period of one year. The testicular weight was minimal during summer, while the maximum weight was attained during the coldest months from November until March. Diameters of the seminiferous tubules were multiphasic with a tende