7 results on '"complex module"'
Search Results
2. ON DEFINITION OF BEAMS INHOMOGENEOUS RHEOLOGICAL PROPERTIES
- Author
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Tatyana A. ANIKINA, Ivan V. BOGACHEV, and Alexander O. VATULYAN
- Subjects
rheological properties ,beam ,complex module ,acoustic methods ,identification. ,Mechanics of engineering. Applied mechanics ,TA349-359 - Abstract
The problem solution of the definition of the beams inhomogeneous rheological properties on the basis of the acoustic method and the analysis of amplitude-frequency dependences is presented. The operator equations linking required and prescribed functions are presented. The iterative process is constructed, computational experiments results of the definition of the beams inhomogeneous rheological properties for various laws of distribution of required features are presented.
- Published
- 2018
3. Representation of Design Artifacts
- Author
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Braha, Dan, Maimon, Oded, Pardalos, Panos M., editor, Hearn, Donald, editor, Braha, Dan, and Maimon, Oded
- Published
- 1998
- Full Text
- View/download PDF
4. ON DEFINITION OF BEAMS INHOMOGENEOUS RHEOLOGICAL PROPERTIES
- Author
-
Tatyana A. ANIKINA, Ivan V. BOGACHEV, and Alexander O. VATULYAN
- Subjects
rheological properties ,beam ,complex module ,acoustic methods ,identification. ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
The problem solution of the definition of the beams inhomogeneous rheological properties on the basis of the acoustic method and the analysis of amplitude-frequency dependences is presented. The operator equations linking required and prescribed functions are presented. The iterative process is constructed, computational experiments results of the definition of the beams inhomogeneous rheological properties for various laws of distribution of required features are presented.
- Published
- 2010
5. Prédiction des propriétés viscoélastiques des enrobés bitumineux: Approches micromécaniques et expérimentales.
- Author
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Cherif, Rabeb, Eddhahak, Anissa, Gabet, Thomas, Hammoum, Ferhat, and Neji, Jamel
- Abstract
The asphalt mixtures are composed of aggregates and asphalt used in the construction of the majority of roads. In order to ensure the sustainability of the infrastructures, the evaluation of the quality and the performances of these materials are essential. In this context, several researches have been focused on the development of predictive models, often empirical ones, in order to deduce the viscoelastic properties of an asphalt mixture based on the properties of its constituents (binder and/or aggregate). In this context, we suggest a homogenization model based on the generalized self-consistent scheme (GSC) to predict the complex module of the asphalt concrete from the properties of its components. In the aim of the approach validation, different types of mixtures (hot and warm) made in the laboratory were tested. The results showed that one can predict the complex modulus of the different types of asphalt concretes for temperatures less than 20 °C. However, beyond this temperature, the precision of the model decreases. Besides, the comparison of the micromechanical model with the rheologic models in literature showed that the suggested model can be also relevant in terms of predictions as the considered models. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
6. Evaluación de laboratorio de mezclas asfálticas calientes producidas con grafito triturado
- Author
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Pereira, Alex Gomes, Vieira, Cristiano da Silva, Oliveira, Marcelo Batista de, Paiva, Júnior Cleber Alves, and Silva, Rafael Luis da
- Subjects
Módulo complexo ,Ángulo de fase ,Ângulo de fase ,Mezcla de asfalto ,Flexão a quatro pontos ,Asphalt mixtures ,Módulo complejo ,Phase angle ,Four point bending test ,Comminuted graphite ,Grafito triturado ,Mistura asfáltica ,Grafite cominuído ,Flexión de cuatro puntos ,Complex module - Abstract
Throughout its history, the construction of road pavements, faces the loss of functional and structural characteristics, due to technological and financial obstacles. In this way, studies of new materials to be used in asphalt concrete become relevant, in order to favor the implementation of more economical maintenance, recovery and pavement design policies due to their greater long-term technical suitability, and in particular , minimize the early maintenance of these structures. In this respect, the main objective of the present work was to experimentally compare through complex module (E *) and phase angle (δ) two types of asphalt concrete, one made with asphalt composition with Portland cement (CA-REF), and the other asphalt composition with comminuted graphite (CA-GRAFC). For this, four point flexion equipment was used, using a uniaxial sinusoidal loading of compression, deformation amplitude of 50μm / m; frequencies of 0.1, 0.2, 0.5, 1, 2, 5, 10 and 20 Hz and temperatures from 0 to 40 ° C, in increments of 5 ° C. After carrying out the mechanical tests, it was found that, under the conditions analyzed, the asphalt composition with comminuted graphite becomes a promising alternative as a material applicable to road pavements, acting as a substitute for the traditional filler (Portland cement). A lo largo de su historia, la construcción de pavimentos viales, enfrenta la pérdida de características funcionales y estructurales, debido a obstáculos tecnológicos y financieros. De esta manera, adquieren relevancia los estudios de nuevos materiales a ser utilizados en el hormigón asfáltico, con el fin de favorecer la implementación de políticas de mantenimiento, recuperación y diseño de pavimentos más económicas por su mayor idoneidad técnica a largo plazo, y en particular , minimizar el mantenimiento temprano de estas estructuras. En este sentido, el objetivo principal del presente trabajo fue comparar experimentalmente mediante módulo complejo (E *) y ángulo de fase (δ) dos tipos de hormigón asfáltico, uno elaborado con composición asfáltica con cemento Portland (CA-REF), y el otro composición asfáltica con grafito triturado (CA-GRAFC). Para ello se utilizó equipo de flexión de cuatro puntos, utilizando una carga de compresión sinusoidal uniaxial, amplitud de deformación de 50μm / m; frecuencias de 0,1, 0,2, 0,5, 1, 2, 5, 10 y 20 Hz y temperaturas de 0 a 40 ° C, en incrementos de 5 ° C. Tras la realización de los ensayos mecánicos, se constató que, en las condiciones analizadas, la composición asfáltica con grafito triturado se convierte en una alternativa prometedora como material aplicable a pavimentos viales, actuando como sustituto del relleno tradicional (cemento Portland). Ao longo de sua história, a construção de pavimentos rodoviários, enfrenta a perda das características funcionais e estruturais, em razão dos obstáculos tecnológicos e financeiros. Dessa forma, tornam-se relevantes os estudos de novos materiais a serem utilizados em concretos asfálticos, a fim de favorecer a implementação de políticas de manutenção, recuperação e projetos de pavimentos mais econômicos pela sua maior adequabilidade técnica a longo prazo, e, em especial, minimizar a manutenção precoce dessas estruturas. Neste aspecto, o objetivo principal do presente trabalho foi compara experimentalmente por meio módulo complexo (E*) e ângulo de fase (δ) dois tipos de concreto asfáltico, uma confeccionada com composição asfáltica com cimento Portland (CA-REF), e a outra composição asfáltica com grafite cominuído (CA-GRAFC). Para isto, empregou-se o equipamento de flexão a quatro pontos, sendo utilizado um carregamento sinusoidal uniaxial de compressão, amplitude de deformação de 50μm/m; frequências de 0,1, 0,2, 0,5, 1, 2, 5, 10 e 20 Hz e temperaturas de 0 a 40°C, com incrementos de 5°C. Após a realização dos ensaios mecânicos, constatou-se que, sob as condições analisadas, a composição asfáltica com grafite cominuído torna-se uma alternativa promissora como material aplicável em pavimentos rodoviários, atuando como substituto do fíler tradicional (cimento Portland).
- Published
- 2021
7. Correspondances entre les coefficients des modèles de fatigue dans les méthodes mécanistiques-empiriques de dimensionnement de chaussées souples.
- Author
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Perraton, Daniel, Di Benedetto, Hervé, and Carter, Alan
- Subjects
- *
BITUMINOUS materials , *MATERIAL fatigue , *PAVEMENTS , *PERFORMANCE of pavements , *SERVICE life , *BITUMINOUS pavements ,PAVEMENT service life - Abstract
Fatigue is considered the main damaging phenomenon at « average » temperature in flexible pavement structures. A fatigue damage model is thus the first step in applying a mechanistic-empirical approach to sizing. This paper highlights the main elements of fatigue models in order to thoroughly understand the various calculation tools available for a mechanistic-empirical sizing application. The signification of the various coefficients of the models is described and interrelations are established. An analysis is proposed to improve the representativeness of the fatigue life span law of the material. All calculation tools for mechanistic-empirical sizing use the Wöhler fatigue curve. Both fatigue curve coefficients are at the core of the models and describe the specific performance of the tested bituminous material families. Processing the results of a classic fatigue test to exclude biased effects will substantially modify the values of these two coefficients. It is demonstrated that the life spans determined from raw results are overestimated. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
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